From e5b85622771090b7529cffdd38c0402a544609ef Mon Sep 17 00:00:00 2001 From: Brian Behlendorf Date: Mon, 21 May 2012 12:59:58 -0700 Subject: [PATCH] Extend CONFIG_DEBUG_LOCK_ALLOC check The CONFIG_DEBUG_LOCK_ALLOC check at configure time was added to detect when mutex_lock() is defined as a GPL-only symbol. However, the check as written only inferred this from this configuration setting, it never actually checked. This change introduces that missing check to prevent false positives. Signed-off-by: Brian Behlendorf --- config/kernel.m4 | 84 +++++++++++++----- configure | 226 ++++++++++++++++++++++++++++++++++++++--------- 2 files changed, 244 insertions(+), 66 deletions(-) diff --git a/config/kernel.m4 b/config/kernel.m4 index 48e92ced4..0f6100071 100644 --- a/config/kernel.m4 +++ b/config/kernel.m4 @@ -311,34 +311,74 @@ 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 # -dnl # CONFIG_PREEMPT - Preempt kernels require special handling. -dnl # -dnl # There are certain kernel build options which when enabled are -dnl # completely incompatible with non GPL kernel modules. It is best -dnl # to detect these at configure time and fail with a clear error -dnl # rather than build everything and fail during linking. -dnl # -dnl # CONFIG_DEBUG_LOCK_ALLOC - Maps mutex_lock() to mutex_lock_nested() -dnl # AC_DEFUN([ZFS_AC_KERNEL_CONFIG], [ - ZFS_LINUX_CONFIG([PREEMPT], - AC_MSG_ERROR([ - *** Kernel built with CONFIG_PREEMPT which is not supported. - *** You must rebuild your kernel without this option.]), []) - - AS_IF([test "$ZFS_META_LICENSE" = CDDL], [ - ZFS_LINUX_CONFIG([DEBUG_LOCK_ALLOC], - AC_MSG_ERROR([ - *** Kernel built with CONFIG_DEBUG_LOCK_ALLOC which is - *** incompatible with the CDDL license. You must rebuild - *** your kernel without this option.]), []) - ]) - AS_IF([test "$ZFS_META_LICENSE" = GPL], [ AC_DEFINE([HAVE_GPL_ONLY_SYMBOLS], [1], [Define to 1 if licensed under the GPL]) ]) + + ZFS_AC_KERNEL_CONFIG_PREEMPT + ZFS_AC_KERNEL_CONFIG_DEBUG_LOCK_ALLOC +]) + +dnl # +dnl # Check CONFIG_PREEMPT +dnl # +dnl # Premptible kernels will be supported in the future. But at the +dnl # moment there are a few places in the code which need to be updated +dnl # to accomidate them. Until that work occurs we should detect this +dnl # at configure time and fail with a sensible message. Otherwise, +dnl # people will be able to build successfully, however they will have +dnl # stability problems. See https://github.com/zfsonlinux/zfs/issues/83 +dnl # +AC_DEFUN([ZFS_AC_KERNEL_CONFIG_PREEMPT], [ + + ZFS_LINUX_CONFIG([PREEMPT], + AC_MSG_ERROR([ + *** Kernel built with CONFIG_PREEMPT which is not supported. + *** You must rebuild your kernel without this option.]), []) +]) + +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="$EXTRA_KCFLAGS" + ZFS_LINUX_TRY_COMPILE([ + #include + #include + + MODULE_LICENSE("$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. You must rebuild your kernel without + *** this option enabled.]) + ]) + EXTRA_KCFLAGS="$tmp_flags" + ], []) ]) dnl # diff --git a/configure b/configure index f891e1aaf..6b198f873 100755 --- a/configure +++ b/configure @@ -12396,6 +12396,19 @@ $as_echo "$SPL_SYMBOLS" >&6; } + if test "$ZFS_META_LICENSE" = GPL; then + + +cat >>confdefs.h <<\_ACEOF +#define HAVE_GPL_ONLY_SYMBOLS 1 +_ACEOF + + +fi + + + + { $as_echo "$as_me:$LINENO: checking whether Linux was built with CONFIG_PREEMPT" >&5 $as_echo_n "checking whether Linux was built with CONFIG_PREEMPT... " >&6; } @@ -12466,9 +12479,9 @@ fi - if test "$ZFS_META_LICENSE" = CDDL; then - { $as_echo "$as_me:$LINENO: checking whether Linux was built with CONFIG_DEBUG_LOCK_ALLOC" >&5 + + { $as_echo "$as_me:$LINENO: checking whether Linux was built with CONFIG_DEBUG_LOCK_ALLOC" >&5 $as_echo_n "checking whether Linux was built with CONFIG_DEBUG_LOCK_ALLOC... " >&6; } @@ -12513,16 +12526,85 @@ _ACEOF { $as_echo "$as_me:$LINENO: result: yes" >&5 $as_echo "yes" >&6; } - { { $as_echo "$as_me:$LINENO: error: - *** Kernel built with CONFIG_DEBUG_LOCK_ALLOC which is - *** incompatible with the CDDL license. You must rebuild - *** your kernel without this option." >&5 + + { $as_echo "$as_me:$LINENO: checking whether mutex_lock() is GPL-only" >&5 +$as_echo_n "checking whether mutex_lock() is GPL-only... " >&6; } + tmp_flags="$EXTRA_KCFLAGS" + + +cat confdefs.h - <<_ACEOF >conftest.c +/* confdefs.h. */ +_ACEOF +cat confdefs.h >>conftest.$ac_ext +cat >>conftest.$ac_ext <<_ACEOF +/* end confdefs.h. */ + + + #include + #include + + MODULE_LICENSE("$ZFS_META_LICENSE"); + +int +main (void) +{ + + struct mutex lock; + + mutex_init(&lock); + mutex_lock(&lock); + mutex_unlock(&lock); + + ; + return 0; +} + +_ACEOF + + + rm -Rf build && mkdir -p build + echo "obj-m := conftest.o" >build/Makefile + if { ac_try='cp conftest.c build && make modules -C $LINUX_OBJ EXTRA_CFLAGS="-Werror-implicit-function-declaration $EXTRA_KCFLAGS" $ARCH_UM M=$PWD/build' + { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5 + (eval $ac_try) 2>&5 + ac_status=$? + $as_echo "$as_me:$LINENO: \$? = $ac_status" >&5 + (exit $ac_status); }; } >/dev/null && { ac_try='test -s build/conftest.o' + { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5 + (eval $ac_try) 2>&5 + ac_status=$? + $as_echo "$as_me:$LINENO: \$? = $ac_status" >&5 + (exit $ac_status); }; }; then + + { $as_echo "$as_me:$LINENO: result: no" >&5 +$as_echo "no" >&6; } + +else + $as_echo "$as_me: failed program was:" >&5 +sed 's/^/| /' conftest.$ac_ext >&5 + + { $as_echo "$as_me:$LINENO: result: yes" >&5 +$as_echo "yes" >&6; } + { { $as_echo "$as_me:$LINENO: error: + *** Kernel built with CONFIG_DEBUG_LOCK_ALLOC which is incompatible + *** with the CDDL license. You must rebuild your kernel without + *** this option enabled." >&5 $as_echo "$as_me: error: - *** Kernel built with CONFIG_DEBUG_LOCK_ALLOC which is - *** incompatible with the CDDL license. You must rebuild - *** your kernel without this option." >&2;} + *** Kernel built with CONFIG_DEBUG_LOCK_ALLOC which is incompatible + *** with the CDDL license. You must rebuild your kernel without + *** this option enabled." >&2;} { (exit 1); exit 1; }; } + + +fi + + rm -Rf build + + + EXTRA_KCFLAGS="$tmp_flags" + + else $as_echo "$as_me: failed program was:" >&5 sed 's/^/| /' conftest.$ac_ext >&5 @@ -12540,19 +12622,6 @@ fi -fi - - - if test "$ZFS_META_LICENSE" = GPL; then - - -cat >>confdefs.h <<\_ACEOF -#define HAVE_GPL_ONLY_SYMBOLS 1 -_ACEOF - - -fi - { $as_echo "$as_me:$LINENO: checking block device operation prototypes" >&5 @@ -18420,6 +18489,19 @@ $as_echo "$SPL_SYMBOLS" >&6; } + if test "$ZFS_META_LICENSE" = GPL; then + + +cat >>confdefs.h <<\_ACEOF +#define HAVE_GPL_ONLY_SYMBOLS 1 +_ACEOF + + +fi + + + + { $as_echo "$as_me:$LINENO: checking whether Linux was built with CONFIG_PREEMPT" >&5 $as_echo_n "checking whether Linux was built with CONFIG_PREEMPT... " >&6; } @@ -18490,9 +18572,9 @@ fi - if test "$ZFS_META_LICENSE" = CDDL; then - { $as_echo "$as_me:$LINENO: checking whether Linux was built with CONFIG_DEBUG_LOCK_ALLOC" >&5 + + { $as_echo "$as_me:$LINENO: checking whether Linux was built with CONFIG_DEBUG_LOCK_ALLOC" >&5 $as_echo_n "checking whether Linux was built with CONFIG_DEBUG_LOCK_ALLOC... " >&6; } @@ -18537,16 +18619,85 @@ _ACEOF { $as_echo "$as_me:$LINENO: result: yes" >&5 $as_echo "yes" >&6; } - { { $as_echo "$as_me:$LINENO: error: - *** Kernel built with CONFIG_DEBUG_LOCK_ALLOC which is - *** incompatible with the CDDL license. You must rebuild - *** your kernel without this option." >&5 + + { $as_echo "$as_me:$LINENO: checking whether mutex_lock() is GPL-only" >&5 +$as_echo_n "checking whether mutex_lock() is GPL-only... " >&6; } + tmp_flags="$EXTRA_KCFLAGS" + + +cat confdefs.h - <<_ACEOF >conftest.c +/* confdefs.h. */ +_ACEOF +cat confdefs.h >>conftest.$ac_ext +cat >>conftest.$ac_ext <<_ACEOF +/* end confdefs.h. */ + + + #include + #include + + MODULE_LICENSE("$ZFS_META_LICENSE"); + +int +main (void) +{ + + struct mutex lock; + + mutex_init(&lock); + mutex_lock(&lock); + mutex_unlock(&lock); + + ; + return 0; +} + +_ACEOF + + + rm -Rf build && mkdir -p build + echo "obj-m := conftest.o" >build/Makefile + if { ac_try='cp conftest.c build && make modules -C $LINUX_OBJ EXTRA_CFLAGS="-Werror-implicit-function-declaration $EXTRA_KCFLAGS" $ARCH_UM M=$PWD/build' + { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5 + (eval $ac_try) 2>&5 + ac_status=$? + $as_echo "$as_me:$LINENO: \$? = $ac_status" >&5 + (exit $ac_status); }; } >/dev/null && { ac_try='test -s build/conftest.o' + { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5 + (eval $ac_try) 2>&5 + ac_status=$? + $as_echo "$as_me:$LINENO: \$? = $ac_status" >&5 + (exit $ac_status); }; }; then + + { $as_echo "$as_me:$LINENO: result: no" >&5 +$as_echo "no" >&6; } + +else + $as_echo "$as_me: failed program was:" >&5 +sed 's/^/| /' conftest.$ac_ext >&5 + + { $as_echo "$as_me:$LINENO: result: yes" >&5 +$as_echo "yes" >&6; } + { { $as_echo "$as_me:$LINENO: error: + *** Kernel built with CONFIG_DEBUG_LOCK_ALLOC which is incompatible + *** with the CDDL license. You must rebuild your kernel without + *** this option enabled." >&5 $as_echo "$as_me: error: - *** Kernel built with CONFIG_DEBUG_LOCK_ALLOC which is - *** incompatible with the CDDL license. You must rebuild - *** your kernel without this option." >&2;} + *** Kernel built with CONFIG_DEBUG_LOCK_ALLOC which is incompatible + *** with the CDDL license. You must rebuild your kernel without + *** this option enabled." >&2;} { (exit 1); exit 1; }; } + + +fi + + rm -Rf build + + + EXTRA_KCFLAGS="$tmp_flags" + + else $as_echo "$as_me: failed program was:" >&5 sed 's/^/| /' conftest.$ac_ext >&5 @@ -18564,19 +18715,6 @@ fi -fi - - - if test "$ZFS_META_LICENSE" = GPL; then - - -cat >>confdefs.h <<\_ACEOF -#define HAVE_GPL_ONLY_SYMBOLS 1 -_ACEOF - - -fi - { $as_echo "$as_me:$LINENO: checking block device operation prototypes" >&5