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608f8749a1
Reduce the time required for ./configure to perform the needed
KABI checks by allowing kbuild to compile multiple test cases in
parallel. This was accomplished by splitting each test's source
code from the logic handling whether that code could be compiled
or not.
By introducing this split it's possible to minimize the number of
times kbuild needs to be invoked. As importantly, it means all of
the tests can be built in parallel. This does require a little extra
care since we expect some tests to fail, so the --keep-going (-k)
option must be provided otherwise some tests may not get compiled.
Furthermore, since a failure during the kbuild modpost phase will
result in an early exit; the final linking phase is limited to tests
which passed the initial compilation and produced an object file.
Once everything has been built the configure script proceeds as
previously. The only significant difference is that it now merely
needs to test for the existence of a .ko file to determine the
result of a given test. This vastly speeds up the entire process.
New test cases should use ZFS_LINUX_TEST_SRC to declare their test
source code and ZFS_LINUX_TEST_RESULT to check the result. All of
the existing kernel-*.m4 files have been updated accordingly, see
config/kernel-current-time.m4 for a basic example. The legacy
ZFS_LINUX_TRY_COMPILE macro has been kept to handle special cases
but it's use is not encouraged.
master (secs) patched (secs)
------------- ----------------
autogen.sh 61 68
configure 137 24 (~17% of current run time)
make -j $(nproc) 44 44
make rpms 287 150
Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #8547
Closes #9132
Closes #9341
87 lines
2.4 KiB
Plaintext
87 lines
2.4 KiB
Plaintext
dnl #
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dnl # 2.6.35 API change,
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dnl # The cachep->gfpflags member was renamed cachep->allocflags. These are
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dnl # private allocation flags which are applied when allocating a new slab
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dnl # in kmem_getpages(). Unfortunately there is no public API for setting
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dnl # non-default flags.
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dnl #
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AC_DEFUN([ZFS_AC_KERNEL_SRC_KMEM_CACHE_ALLOCFLAGS], [
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ZFS_LINUX_TEST_SRC([kmem_cache_allocflags], [
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#include <linux/slab.h>
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],[
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struct kmem_cache cachep __attribute__ ((unused));
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cachep.allocflags = GFP_KERNEL;
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])
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ZFS_LINUX_TEST_SRC([kmem_cache_gfpflags], [
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#include <linux/slab.h>
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],[
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struct kmem_cache cachep __attribute__ ((unused));
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cachep.gfpflags = GFP_KERNEL;
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])
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])
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AC_DEFUN([ZFS_AC_KERNEL_KMEM_CACHE_ALLOCFLAGS], [
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AC_MSG_CHECKING([whether struct kmem_cache has allocflags])
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ZFS_LINUX_TEST_RESULT([kmem_cache_allocflags], [
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AC_MSG_RESULT(yes)
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AC_DEFINE(HAVE_KMEM_CACHE_ALLOCFLAGS, 1,
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[struct kmem_cache has allocflags])
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],[
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AC_MSG_RESULT(no)
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AC_MSG_CHECKING([whether struct kmem_cache has gfpflags])
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ZFS_LINUX_TEST_RESULT([kmem_cache_gfpflags], [
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AC_MSG_RESULT(yes)
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AC_DEFINE(HAVE_KMEM_CACHE_GFPFLAGS, 1,
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[struct kmem_cache has gfpflags])
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],[
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AC_MSG_RESULT(no)
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])
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])
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])
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dnl #
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dnl # grsecurity API change,
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dnl # kmem_cache_create() with SLAB_USERCOPY flag replaced by
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dnl # kmem_cache_create_usercopy().
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dnl #
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AC_DEFUN([ZFS_AC_KERNEL_SRC_KMEM_CACHE_CREATE_USERCOPY], [
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ZFS_LINUX_TEST_SRC([kmem_cache_create_usercopy], [
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#include <linux/slab.h>
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static void ctor(void *foo) { /* fake ctor */ }
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],[
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struct kmem_cache *skc_linux_cache;
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const char *name = "test";
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size_t size = 4096;
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size_t align = 8;
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unsigned long flags = 0;
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size_t useroffset = 0;
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size_t usersize = size - useroffset;
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skc_linux_cache = kmem_cache_create_usercopy(
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name, size, align, flags, useroffset, usersize, ctor);
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])
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])
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AC_DEFUN([ZFS_AC_KERNEL_KMEM_CACHE_CREATE_USERCOPY], [
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AC_MSG_CHECKING([whether kmem_cache_create_usercopy() exists])
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ZFS_LINUX_TEST_RESULT([kmem_cache_create_usercopy], [
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AC_MSG_RESULT(yes)
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AC_DEFINE(HAVE_KMEM_CACHE_CREATE_USERCOPY, 1,
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[kmem_cache_create_usercopy() exists])
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],[
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AC_MSG_RESULT(no)
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])
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])
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AC_DEFUN([ZFS_AC_KERNEL_SRC_KMEM_CACHE], [
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ZFS_AC_KERNEL_SRC_KMEM_CACHE_ALLOCFLAGS
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ZFS_AC_KERNEL_SRC_KMEM_CACHE_CREATE_USERCOPY
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])
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AC_DEFUN([ZFS_AC_KERNEL_KMEM_CACHE], [
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ZFS_AC_KERNEL_KMEM_CACHE_ALLOCFLAGS
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ZFS_AC_KERNEL_KMEM_CACHE_CREATE_USERCOPY
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])
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