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https://git.proxmox.com/git/mirror_zfs.git
synced 2024-12-26 03:09:34 +03:00
0f62f3f9ab
GCC >+ 4.8's aggressive loop optimization breaks some of the iterators
over the dn_blkptr[] pseudo-array in dnode_phys. Since dn_blkptr[] is
defined as a single-element array, GCC believes an iterator can only
access index 0 and will unroll the loop into a single iteration.
One way to resolve the issue would be to cast the array to a pointer
and fix all the iterators that might break. The only loop where it
is known to cause a problem is this loop in dmu_objset_write_ready():
for (i = 0; i < dnp->dn_nblkptr; i++)
bp->blk_fill += dnp->dn_blkptr[i].blk_fill;
In the common case where dn_nblkptr is 3, the loop is only executed a
single time and "i" is equal to 1 following the loop.
The specific breakage caused by this problem is that the blk_fill of
root block pointers wouldn't be set properly when more than one blkptr
is in use (when no indrect blocks are needed).
The simple reproducing sequence is:
zpool create tank /tank.img
zdb -ddddd tank 0
Notice that "fill=31", however, there are two L0 indirect blocks with
"F=31" and "F=5". The fill count should be 36 rather than 31. This
problem causes an assert to be hit in a simple "zdb tank" when built
with --enable-debug.
However, this approach was not taken because we need to be absolutely
sure we catch all instances of this unwanted optimization. Therefore,
the build system has been updated to detect if GCC supports the
aggressive loop optimization. If it does the optimization will be
explicitly disabled using the -fno-aggressive-loop-optimization option.
Original-fix-by: Tim Chase <tim@chase2k.com>
Signed-off-by: Tim Chase <tim@chase2k.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #2010
Closes #2051
618 lines
17 KiB
Plaintext
618 lines
17 KiB
Plaintext
dnl #
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dnl # Default ZFS kernel configuration
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dnl #
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AC_DEFUN([ZFS_AC_CONFIG_KERNEL], [
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ZFS_AC_KERNEL
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ZFS_AC_SPL
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ZFS_AC_TEST_MODULE
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ZFS_AC_KERNEL_CONFIG
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ZFS_AC_KERNEL_BDEV_BLOCK_DEVICE_OPERATIONS
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ZFS_AC_KERNEL_BLOCK_DEVICE_OPERATIONS_RELEASE_VOID
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ZFS_AC_KERNEL_TYPE_FMODE_T
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ZFS_AC_KERNEL_KOBJ_NAME_LEN
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ZFS_AC_KERNEL_3ARG_BLKDEV_GET
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ZFS_AC_KERNEL_BLKDEV_GET_BY_PATH
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ZFS_AC_KERNEL_OPEN_BDEV_EXCLUSIVE
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ZFS_AC_KERNEL_LOOKUP_BDEV
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ZFS_AC_KERNEL_INVALIDATE_BDEV_ARGS
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ZFS_AC_KERNEL_BDEV_LOGICAL_BLOCK_SIZE
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ZFS_AC_KERNEL_BDEV_PHYSICAL_BLOCK_SIZE
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ZFS_AC_KERNEL_BIO_FAILFAST
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ZFS_AC_KERNEL_BIO_FAILFAST_DTD
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ZFS_AC_KERNEL_REQ_FAILFAST_MASK
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ZFS_AC_KERNEL_BIO_END_IO_T_ARGS
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ZFS_AC_KERNEL_BIO_RW_SYNC
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ZFS_AC_KERNEL_BIO_RW_SYNCIO
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ZFS_AC_KERNEL_REQ_SYNC
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ZFS_AC_KERNEL_BLK_END_REQUEST
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ZFS_AC_KERNEL_BLK_QUEUE_FLUSH
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ZFS_AC_KERNEL_BLK_QUEUE_MAX_HW_SECTORS
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ZFS_AC_KERNEL_BLK_QUEUE_MAX_SEGMENTS
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ZFS_AC_KERNEL_BLK_QUEUE_PHYSICAL_BLOCK_SIZE
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ZFS_AC_KERNEL_BLK_QUEUE_IO_OPT
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ZFS_AC_KERNEL_BLK_QUEUE_NONROT
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ZFS_AC_KERNEL_BLK_QUEUE_DISCARD
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ZFS_AC_KERNEL_BLK_FETCH_REQUEST
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ZFS_AC_KERNEL_BLK_REQUEUE_REQUEST
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ZFS_AC_KERNEL_BLK_RQ_BYTES
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ZFS_AC_KERNEL_BLK_RQ_POS
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ZFS_AC_KERNEL_BLK_RQ_SECTORS
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ZFS_AC_KERNEL_GET_DISK_RO
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ZFS_AC_KERNEL_GET_GENDISK
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ZFS_AC_KERNEL_RQ_IS_SYNC
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ZFS_AC_KERNEL_RQ_FOR_EACH_SEGMENT
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ZFS_AC_KERNEL_DISCARD_GRANULARITY
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ZFS_AC_KERNEL_CONST_XATTR_HANDLER
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ZFS_AC_KERNEL_XATTR_HANDLER_GET
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ZFS_AC_KERNEL_XATTR_HANDLER_SET
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ZFS_AC_KERNEL_XATTR_HANDLER_LIST
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ZFS_AC_KERNEL_INODE_OWNER_OR_CAPABLE
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ZFS_AC_KERNEL_POSIX_ACL_FROM_XATTR_USERNS
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ZFS_AC_KERNEL_POSIX_ACL_RELEASE
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ZFS_AC_KERNEL_POSIX_ACL_CHMOD
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ZFS_AC_KERNEL_POSIX_ACL_CACHING
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ZFS_AC_KERNEL_POSIX_ACL_EQUIV_MODE_WANTS_UMODE_T
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ZFS_AC_KERNEL_INODE_OPERATIONS_PERMISSION
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ZFS_AC_KERNEL_INODE_OPERATIONS_PERMISSION_WITH_NAMEIDATA
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ZFS_AC_KERNEL_INODE_OPERATIONS_CHECK_ACL
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ZFS_AC_KERNEL_INODE_OPERATIONS_CHECK_ACL_WITH_FLAGS
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ZFS_AC_KERNEL_INODE_OPERATIONS_GET_ACL
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ZFS_AC_KERNEL_CURRENT_UMASK
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ZFS_AC_KERNEL_SHOW_OPTIONS
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ZFS_AC_KERNEL_FSYNC
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ZFS_AC_KERNEL_EVICT_INODE
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ZFS_AC_KERNEL_DIRTY_INODE_WITH_FLAGS
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ZFS_AC_KERNEL_NR_CACHED_OBJECTS
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ZFS_AC_KERNEL_FREE_CACHED_OBJECTS
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ZFS_AC_KERNEL_FALLOCATE
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ZFS_AC_KERNEL_MKDIR_UMODE_T
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ZFS_AC_KERNEL_LOOKUP_NAMEIDATA
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ZFS_AC_KERNEL_CREATE_NAMEIDATA
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ZFS_AC_KERNEL_TRUNCATE_RANGE
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ZFS_AC_KERNEL_AUTOMOUNT
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ZFS_AC_KERNEL_ENCODE_FH_WITH_INODE
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ZFS_AC_KERNEL_COMMIT_METADATA
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ZFS_AC_KERNEL_CLEAR_INODE
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ZFS_AC_KERNEL_INSERT_INODE_LOCKED
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ZFS_AC_KERNEL_D_MAKE_ROOT
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ZFS_AC_KERNEL_D_OBTAIN_ALIAS
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ZFS_AC_KERNEL_D_SET_D_OP
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ZFS_AC_KERNEL_D_REVALIDATE_NAMEIDATA
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ZFS_AC_KERNEL_CONST_DENTRY_OPERATIONS
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ZFS_AC_KERNEL_CHECK_DISK_SIZE_CHANGE
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ZFS_AC_KERNEL_TRUNCATE_SETSIZE
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ZFS_AC_KERNEL_6ARGS_SECURITY_INODE_INIT_SECURITY
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ZFS_AC_KERNEL_CALLBACK_SECURITY_INODE_INIT_SECURITY
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ZFS_AC_KERNEL_MOUNT_NODEV
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ZFS_AC_KERNEL_SHRINK
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ZFS_AC_KERNEL_S_INSTANCES_LIST_HEAD
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ZFS_AC_KERNEL_S_D_OP
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ZFS_AC_KERNEL_BDI
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ZFS_AC_KERNEL_BDI_SETUP_AND_REGISTER
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ZFS_AC_KERNEL_SET_NLINK
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ZFS_AC_KERNEL_ELEVATOR_CHANGE
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ZFS_AC_KERNEL_5ARG_SGET
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ZFS_AC_KERNEL_LSEEK_EXECUTE
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ZFS_AC_KERNEL_VFS_ITERATE
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AS_IF([test "$LINUX_OBJ" != "$LINUX"], [
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KERNELMAKE_PARAMS="$KERNELMAKE_PARAMS O=$LINUX_OBJ"
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])
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AC_SUBST(KERNELMAKE_PARAMS)
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dnl # -Wall -fno-strict-aliasing -Wstrict-prototypes and other
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dnl # compiler options are added by the kernel build system.
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KERNELCPPFLAGS="$KERNELCPPFLAGS $NO_UNUSED_BUT_SET_VARIABLE"
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KERNELCPPFLAGS="$KERNELCPPFLAGS $NO_AGGRESSIVE_LOOP_OPTIMIZATIONS"
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KERNELCPPFLAGS="$KERNELCPPFLAGS -DHAVE_SPL -D_KERNEL"
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KERNELCPPFLAGS="$KERNELCPPFLAGS -DTEXT_DOMAIN=\\\"zfs-linux-kernel\\\""
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AC_SUBST(KERNELCPPFLAGS)
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])
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dnl #
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dnl # Detect name used for Module.symvers file in kernel
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dnl #
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AC_DEFUN([ZFS_AC_MODULE_SYMVERS], [
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modpost=$LINUX/scripts/Makefile.modpost
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AC_MSG_CHECKING([kernel file name for module symbols])
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AS_IF([test "x$enable_linux_builtin" != xyes -a -f "$modpost"], [
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AS_IF([grep -q Modules.symvers $modpost], [
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LINUX_SYMBOLS=Modules.symvers
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], [
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LINUX_SYMBOLS=Module.symvers
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])
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AS_IF([test ! -f "$LINUX_OBJ/$LINUX_SYMBOLS"], [
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AC_MSG_ERROR([
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*** Please make sure the kernel devel package for your distribution
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*** is installed. If you are building with a custom kernel, make sure the
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*** kernel is configured, built, and the '--with-linux=PATH' configure
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*** option refers to the location of the kernel source.])
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])
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], [
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LINUX_SYMBOLS=NONE
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])
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AC_MSG_RESULT($LINUX_SYMBOLS)
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AC_SUBST(LINUX_SYMBOLS)
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])
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dnl #
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dnl # Detect the kernel to be built against
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dnl #
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AC_DEFUN([ZFS_AC_KERNEL], [
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AC_ARG_WITH([linux],
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AS_HELP_STRING([--with-linux=PATH],
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[Path to kernel source]),
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[kernelsrc="$withval"])
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AC_ARG_WITH(linux-obj,
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AS_HELP_STRING([--with-linux-obj=PATH],
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[Path to kernel build objects]),
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[kernelbuild="$withval"])
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AC_MSG_CHECKING([kernel source directory])
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AS_IF([test -z "$kernelsrc"], [
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AS_IF([test -e "/lib/modules/$(uname -r)/source"], [
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headersdir="/lib/modules/$(uname -r)/source"
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sourcelink=$(readlink -f "$headersdir")
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], [test -e "/lib/modules/$(uname -r)/build"], [
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headersdir="/lib/modules/$(uname -r)/build"
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sourcelink=$(readlink -f "$headersdir")
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], [
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sourcelink=$(ls -1d /usr/src/kernels/* \
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/usr/src/linux-* \
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2>/dev/null | grep -v obj | tail -1)
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])
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AS_IF([test -n "$sourcelink" && test -e ${sourcelink}], [
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kernelsrc=`readlink -f ${sourcelink}`
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], [
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kernelsrc="[Not found]"
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])
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], [
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AS_IF([test "$kernelsrc" = "NONE"], [
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kernsrcver=NONE
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])
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])
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AC_MSG_RESULT([$kernelsrc])
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AS_IF([test ! -d "$kernelsrc"], [
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AC_MSG_ERROR([
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*** Please make sure the kernel devel package for your distribution
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*** is installed and then try again. If that fails, you can specify the
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*** location of the kernel source with the '--with-linux=PATH' option.])
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])
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AC_MSG_CHECKING([kernel build directory])
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AS_IF([test -z "$kernelbuild"], [
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AS_IF([test -e "/lib/modules/$(uname -r)/build"], [
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kernelbuild=`readlink -f /lib/modules/$(uname -r)/build`
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], [test -d ${kernelsrc}-obj/${target_cpu}/${target_cpu}], [
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kernelbuild=${kernelsrc}-obj/${target_cpu}/${target_cpu}
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], [test -d ${kernelsrc}-obj/${target_cpu}/default], [
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kernelbuild=${kernelsrc}-obj/${target_cpu}/default
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], [test -d `dirname ${kernelsrc}`/build-${target_cpu}], [
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kernelbuild=`dirname ${kernelsrc}`/build-${target_cpu}
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], [
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kernelbuild=${kernelsrc}
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])
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])
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AC_MSG_RESULT([$kernelbuild])
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AC_MSG_CHECKING([kernel source version])
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utsrelease1=$kernelbuild/include/linux/version.h
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utsrelease2=$kernelbuild/include/linux/utsrelease.h
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utsrelease3=$kernelbuild/include/generated/utsrelease.h
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AS_IF([test -r $utsrelease1 && fgrep -q UTS_RELEASE $utsrelease1], [
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utsrelease=linux/version.h
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], [test -r $utsrelease2 && fgrep -q UTS_RELEASE $utsrelease2], [
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utsrelease=linux/utsrelease.h
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], [test -r $utsrelease3 && fgrep -q UTS_RELEASE $utsrelease3], [
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utsrelease=generated/utsrelease.h
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])
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AS_IF([test "$utsrelease"], [
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kernsrcver=`(echo "#include <$utsrelease>";
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echo "kernsrcver=UTS_RELEASE") |
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cpp -I $kernelbuild/include |
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grep "^kernsrcver=" | cut -d \" -f 2`
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AS_IF([test -z "$kernsrcver"], [
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AC_MSG_RESULT([Not found])
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AC_MSG_ERROR([*** Cannot determine kernel version.])
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])
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], [
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AC_MSG_RESULT([Not found])
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if test "x$enable_linux_builtin" != xyes; then
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AC_MSG_ERROR([*** Cannot find UTS_RELEASE definition.])
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else
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AC_MSG_ERROR([
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*** Cannot find UTS_RELEASE definition.
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*** Please run 'make prepare' inside the kernel source tree.])
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fi
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])
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AC_MSG_RESULT([$kernsrcver])
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LINUX=${kernelsrc}
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LINUX_OBJ=${kernelbuild}
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LINUX_VERSION=${kernsrcver}
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AC_SUBST(LINUX)
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AC_SUBST(LINUX_OBJ)
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AC_SUBST(LINUX_VERSION)
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ZFS_AC_MODULE_SYMVERS
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])
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dnl #
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dnl # Detect the SPL module to be built against
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dnl #
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AC_DEFUN([ZFS_AC_SPL], [
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AC_ARG_WITH([spl],
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AS_HELP_STRING([--with-spl=PATH],
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[Path to spl source]),
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[splsrc="$withval"])
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AC_ARG_WITH([spl-obj],
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AS_HELP_STRING([--with-spl-obj=PATH],
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[Path to spl build objects]),
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[splbuild="$withval"])
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AC_ARG_WITH([spl-timeout],
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AS_HELP_STRING([--with-spl-timeout=SECS],
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[Wait SECS for SPL header and symver file @<:@default=0@:>@]),
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[timeout="$withval"], [timeout=0])
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dnl #
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dnl # The existence of spl.release.in is used to identify a valid
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dnl # source directory. In order of preference:
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dnl #
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splsrc0="/var/lib/dkms/spl/${VERSION}/build"
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splsrc1="/usr/src/spl-${VERSION}/${LINUX_VERSION}"
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splsrc2="/usr/src/spl-${VERSION}"
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splsrc3="../spl/"
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splsrc4="$LINUX"
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AC_MSG_CHECKING([spl source directory])
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AS_IF([test -z "${splsrc}"], [
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AS_IF([ test -e "${splsrc0}/spl.release.in"], [
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splsrc=${splsrc0}
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], [ test -e "${splsrc1}/spl.release.in"], [
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splsrc=${splsrc1}
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], [ test -e "${splsrc2}/spl.release.in"], [
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splsrc=${splsrc2}
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], [ test -e "${splsrc3}/spl.release.in"], [
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splsrc=$(readlink -f "${splsrc3}")
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], [ test -e "${splsrc4}/spl.release.in" ], [
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splsrc=${splsrc4}
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], [
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splsrc="[Not found]"
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])
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], [
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AS_IF([test "$splsrc" = "NONE"], [
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splbuild=NONE
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splsrcver=NONE
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])
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])
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AC_MSG_RESULT([$splsrc])
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AS_IF([ test ! -e "$splsrc/spl.release.in"], [
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AC_MSG_ERROR([
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*** Please make sure the kmod spl devel package for your distribution
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*** is installed then try again. If that fails you can specify the
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*** location of the spl source with the '--with-spl=PATH' option.])
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])
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dnl #
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dnl # The existence of the spl_config.h is used to identify a valid
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dnl # spl object directory. In many cases the object and source
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dnl # directory are the same, however the objects may also reside
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dnl # is a subdirectory named after the kernel version.
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dnl #
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dnl # This file is supposed to be available after DKMS finishes
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dnl # building the SPL kernel module for the target kernel. The
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dnl # '--with-spl-timeout' option can be passed to pause here,
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dnl # waiting for the file to appear from a concurrently building
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dnl # SPL package.
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dnl #
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AC_MSG_CHECKING([spl build directory])
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while true; do
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AS_IF([test -z "$splbuild"], [
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AS_IF([ test -e "${splsrc}/${LINUX_VERSION}/spl_config.h" ], [
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splbuild="${splsrc}/${LINUX_VERSION}"
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], [ test -e "${splsrc}/spl_config.h" ], [
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splbuild="${splsrc}"
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], [
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splbuild="[Not found]"
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])
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])
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AS_IF([test -e "$splbuild/spl_config.h" -o $timeout -le 0], [
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break;
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], [
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sleep 1
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timeout=$((timeout-1))
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])
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done
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AC_MSG_RESULT([$splbuild])
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AS_IF([ ! test -e "$splbuild/spl_config.h"], [
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AC_MSG_ERROR([
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*** Please make sure the kmod spl devel <kernel> package for your
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*** distribution is installed then try again. If that fails you
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*** can specify the location of the spl objects with the
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*** '--with-spl-obj=PATH' option.])
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])
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AC_MSG_CHECKING([spl source version])
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AS_IF([test -r $splbuild/spl_config.h &&
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fgrep -q SPL_META_VERSION $splbuild/spl_config.h], [
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splsrcver=`(echo "#include <spl_config.h>";
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echo "splsrcver=SPL_META_VERSION-SPL_META_RELEASE") |
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cpp -I $splbuild |
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grep "^splsrcver=" | tr -d \" | cut -d= -f2`
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])
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AS_IF([test -z "$splsrcver"], [
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AC_MSG_RESULT([Not found])
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AC_MSG_ERROR([
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*** Cannot determine the version of the spl source.
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*** Please prepare the spl source before running this script])
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])
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AC_MSG_RESULT([$splsrcver])
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SPL=${splsrc}
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SPL_OBJ=${splbuild}
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SPL_VERSION=${splsrcver}
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AC_SUBST(SPL)
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AC_SUBST(SPL_OBJ)
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AC_SUBST(SPL_VERSION)
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dnl #
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dnl # Detect the name used for the SPL Module.symvers file. If one
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dnl # does not exist this is likely because the SPL has been configured
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dnl # but not built. The '--with-spl-timeout' option can be passed
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dnl # to pause here, waiting for the file to appear from a concurrently
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dnl # building SPL package. If the file does not appear in time, a good
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dnl # guess is made as to what this file will be named based on what it
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dnl # is named in the kernel build products. This file will first be
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dnl # used at link time so if the guess is wrong the build will fail
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dnl # then. This unfortunately means the ZFS package does not contain a
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dnl # reliable mechanism to detect symbols exported by the SPL at
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dnl # configure time.
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dnl #
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AC_MSG_CHECKING([spl file name for module symbols])
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SPL_SYMBOLS=NONE
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|
while true; do
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AS_IF([test -r $SPL_OBJ/Module.symvers], [
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SPL_SYMBOLS=Module.symvers
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], [test -r $SPL_OBJ/Modules.symvers], [
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SPL_SYMBOLS=Modules.symvers
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], [test -r $SPL_OBJ/module/Module.symvers], [
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SPL_SYMBOLS=Module.symvers
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], [test -r $SPL_OBJ/module/Modules.symvers], [
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SPL_SYMBOLS=Modules.symvers
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])
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AS_IF([test $SPL_SYMBOLS != NONE -o $timeout -le 0], [
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break;
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], [
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sleep 1
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timeout=$((timeout-1))
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])
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done
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AS_IF([test "$SPL_SYMBOLS" = NONE], [
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SPL_SYMBOLS=$LINUX_SYMBOLS
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])
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|
|
|
AC_MSG_RESULT([$SPL_SYMBOLS])
|
|
AC_SUBST(SPL_SYMBOLS)
|
|
])
|
|
|
|
dnl #
|
|
dnl # Basic toolchain sanity check.
|
|
dnl #
|
|
AC_DEFUN([ZFS_AC_TEST_MODULE],
|
|
[AC_MSG_CHECKING([whether modules can be built])
|
|
ZFS_LINUX_TRY_COMPILE([],[],[
|
|
AC_MSG_RESULT([yes])
|
|
],[
|
|
AC_MSG_RESULT([no])
|
|
if test "x$enable_linux_builtin" != xyes; then
|
|
AC_MSG_ERROR([*** Unable to build an empty module.])
|
|
else
|
|
AC_MSG_ERROR([
|
|
*** Unable to build an empty module.
|
|
*** Please run 'make scripts' inside the kernel source tree.])
|
|
fi
|
|
])
|
|
])
|
|
|
|
dnl #
|
|
dnl # Certain kernel build options are not supported. These must be
|
|
dnl # detected at configure time and cause a build failure. Otherwise
|
|
dnl # modules may be successfully built that behave incorrectly.
|
|
dnl #
|
|
AC_DEFUN([ZFS_AC_KERNEL_CONFIG], [
|
|
|
|
AS_IF([test "$ZFS_META_LICENSE" = GPL], [
|
|
AC_DEFINE([HAVE_GPL_ONLY_SYMBOLS], [1],
|
|
[Define to 1 if licensed under the GPL])
|
|
])
|
|
|
|
ZFS_AC_KERNEL_CONFIG_DEBUG_LOCK_ALLOC
|
|
])
|
|
|
|
dnl #
|
|
dnl # Check CONFIG_DEBUG_LOCK_ALLOC
|
|
dnl #
|
|
dnl # This is typically only set for debug kernels because it comes with
|
|
dnl # a performance penalty. However, when it is set it maps the non-GPL
|
|
dnl # symbol mutex_lock() to the GPL-only mutex_lock_nested() symbol.
|
|
dnl # This will cause a failure at link time which we'd rather know about
|
|
dnl # at compile time.
|
|
dnl #
|
|
dnl # Since we plan to pursue making mutex_lock_nested() a non-GPL symbol
|
|
dnl # with the upstream community we add a check to detect this case.
|
|
dnl #
|
|
AC_DEFUN([ZFS_AC_KERNEL_CONFIG_DEBUG_LOCK_ALLOC], [
|
|
|
|
ZFS_LINUX_CONFIG([DEBUG_LOCK_ALLOC], [
|
|
AC_MSG_CHECKING([whether mutex_lock() is GPL-only])
|
|
tmp_flags="$EXTRA_KCFLAGS"
|
|
ZFS_LINUX_TRY_COMPILE([
|
|
#include <linux/module.h>
|
|
#include <linux/mutex.h>
|
|
|
|
MODULE_LICENSE("$ZFS_META_LICENSE");
|
|
],[
|
|
struct mutex lock;
|
|
|
|
mutex_init(&lock);
|
|
mutex_lock(&lock);
|
|
mutex_unlock(&lock);
|
|
],[
|
|
AC_MSG_RESULT(no)
|
|
],[
|
|
AC_MSG_RESULT(yes)
|
|
AC_MSG_ERROR([
|
|
*** Kernel built with CONFIG_DEBUG_LOCK_ALLOC which is incompatible
|
|
*** with the CDDL license and will prevent the module linking stage
|
|
*** from succeeding. You must rebuild your kernel without this
|
|
*** option enabled.])
|
|
])
|
|
EXTRA_KCFLAGS="$tmp_flags"
|
|
], [])
|
|
])
|
|
|
|
dnl #
|
|
dnl # ZFS_LINUX_CONFTEST
|
|
dnl #
|
|
AC_DEFUN([ZFS_LINUX_CONFTEST], [
|
|
cat confdefs.h - <<_ACEOF >conftest.c
|
|
$1
|
|
_ACEOF
|
|
])
|
|
|
|
dnl #
|
|
dnl # ZFS_LANG_PROGRAM(C)([PROLOGUE], [BODY])
|
|
dnl #
|
|
m4_define([ZFS_LANG_PROGRAM], [
|
|
$1
|
|
int
|
|
main (void)
|
|
{
|
|
dnl Do *not* indent the following line: there may be CPP directives.
|
|
dnl Don't move the `;' right after for the same reason.
|
|
$2
|
|
;
|
|
return 0;
|
|
}
|
|
])
|
|
|
|
dnl #
|
|
dnl # ZFS_LINUX_COMPILE_IFELSE / like AC_COMPILE_IFELSE
|
|
dnl #
|
|
AC_DEFUN([ZFS_LINUX_COMPILE_IFELSE], [
|
|
m4_ifvaln([$1], [ZFS_LINUX_CONFTEST([$1])])
|
|
rm -Rf build && mkdir -p build && touch build/conftest.mod.c
|
|
echo "obj-m := conftest.o" >build/Makefile
|
|
modpost_flag=''
|
|
test "x$enable_linux_builtin" = xyes && modpost_flag='modpost=true' # fake modpost stage
|
|
AS_IF(
|
|
[AC_TRY_COMMAND(cp conftest.c build && make [$2] -C $LINUX_OBJ EXTRA_CFLAGS="-Werror $EXTRA_KCFLAGS" $ARCH_UM M=$PWD/build $modpost_flag) >/dev/null && AC_TRY_COMMAND([$3])],
|
|
[$4],
|
|
[_AC_MSG_LOG_CONFTEST m4_ifvaln([$5],[$5])]
|
|
)
|
|
rm -Rf build
|
|
])
|
|
|
|
dnl #
|
|
dnl # ZFS_LINUX_TRY_COMPILE like AC_TRY_COMPILE
|
|
dnl #
|
|
AC_DEFUN([ZFS_LINUX_TRY_COMPILE],
|
|
[ZFS_LINUX_COMPILE_IFELSE(
|
|
[AC_LANG_SOURCE([ZFS_LANG_PROGRAM([[$1]], [[$2]])])],
|
|
[modules],
|
|
[test -s build/conftest.o],
|
|
[$3], [$4])
|
|
])
|
|
|
|
dnl #
|
|
dnl # ZFS_LINUX_CONFIG
|
|
dnl #
|
|
AC_DEFUN([ZFS_LINUX_CONFIG],
|
|
[AC_MSG_CHECKING([whether Linux was built with CONFIG_$1])
|
|
ZFS_LINUX_TRY_COMPILE([
|
|
#include <linux/module.h>
|
|
],[
|
|
#ifndef CONFIG_$1
|
|
#error CONFIG_$1 not #defined
|
|
#endif
|
|
],[
|
|
AC_MSG_RESULT([yes])
|
|
$2
|
|
],[
|
|
AC_MSG_RESULT([no])
|
|
$3
|
|
])
|
|
])
|
|
|
|
dnl #
|
|
dnl # ZFS_CHECK_SYMBOL_EXPORT
|
|
dnl # check symbol exported or not
|
|
dnl #
|
|
AC_DEFUN([ZFS_CHECK_SYMBOL_EXPORT], [
|
|
grep -q -E '[[[:space:]]]$1[[[:space:]]]' \
|
|
$LINUX_OBJ/$LINUX_SYMBOLS 2>/dev/null
|
|
rc=$?
|
|
if test $rc -ne 0; then
|
|
export=0
|
|
for file in $2; do
|
|
grep -q -E "EXPORT_SYMBOL.*($1)" \
|
|
"$LINUX/$file" 2>/dev/null
|
|
rc=$?
|
|
if test $rc -eq 0; then
|
|
export=1
|
|
break;
|
|
fi
|
|
done
|
|
if test $export -eq 0; then :
|
|
$4
|
|
else :
|
|
$3
|
|
fi
|
|
else :
|
|
$3
|
|
fi
|
|
])
|
|
|
|
dnl #
|
|
dnl # ZFS_LINUX_TRY_COMPILE_SYMBOL
|
|
dnl # like ZFS_LINUX_TRY_COMPILE, except ZFS_CHECK_SYMBOL_EXPORT
|
|
dnl # is called if not compiling for builtin
|
|
dnl #
|
|
AC_DEFUN([ZFS_LINUX_TRY_COMPILE_SYMBOL], [
|
|
ZFS_LINUX_TRY_COMPILE([$1], [$2], [rc=0], [rc=1])
|
|
if test $rc -ne 0; then :
|
|
$6
|
|
else
|
|
if test "x$enable_linux_builtin" != xyes; then
|
|
ZFS_CHECK_SYMBOL_EXPORT([$3], [$4], [rc=0], [rc=1])
|
|
fi
|
|
if test $rc -ne 0; then :
|
|
$6
|
|
else :
|
|
$5
|
|
fi
|
|
fi
|
|
])
|