Imported Upstream version 0.6.5.8

[mirror_spl-debian.git] / config / spl-build.m4

diff --git a/config/spl-build.m4 b/config/spl-build.m4
index b9c04a95e01d60aa6d92d81e49836d200085f542..c401fd8bca1c5dbdcbd3fc4500922fd193ad3eac 100644 (file)
--- a/config/spl-build.m4
+++ b/config/spl-build.m4
@@ -24,6 +24,7 @@ AC_DEFUN([SPL_AC_CONFIG_KERNEL], [
        SPL_AC_ATOMIC_SPINLOCK
        SPL_AC_SHRINKER_CALLBACK
        SPL_AC_CTL_NAME
+       SPL_AC_CONFIG_TRIM_UNUSED_KSYMS
        SPL_AC_PDE_DATA
        SPL_AC_SET_FS_PWD_WITH_CONST
        SPL_AC_2ARGS_VFS_UNLINK
@@ -39,11 +40,15 @@ AC_DEFUN([SPL_AC_CONFIG_KERNEL], [
        SPL_AC_2ARGS_ZLIB_DEFLATE_WORKSPACESIZE
        SPL_AC_SHRINK_CONTROL_STRUCT
        SPL_AC_RWSEM_SPINLOCK_IS_RAW
+       SPL_AC_RWSEM_ACTIVITY
+       SPL_AC_RWSEM_ATOMIC_LONG_COUNT
        SPL_AC_SCHED_RT_HEADER
        SPL_AC_2ARGS_VFS_GETATTR
        SPL_AC_USLEEP_RANGE
        SPL_AC_KMEM_CACHE_ALLOCFLAGS
        SPL_AC_WAIT_ON_BIT
+       SPL_AC_INODE_LOCK
+       SPL_AC_MUTEX_OWNER
 ])
 
 AC_DEFUN([SPL_AC_MODULE_SYMVERS], [
@@ -1244,6 +1249,26 @@ AC_DEFUN([SPL_AC_CONFIG_ZLIB_DEFLATE], [
        ])
 ])
 
+dnl #
+dnl # config trim unused symbols,
+dnl # Verify the kernel has CONFIG_TRIM_UNUSED_KSYMS DISABLED.
+dnl #
+AC_DEFUN([SPL_AC_CONFIG_TRIM_UNUSED_KSYMS], [
+       AC_MSG_CHECKING([whether CONFIG_TRIM_UNUSED_KSYM is disabled])
+       SPL_LINUX_TRY_COMPILE([
+               #if defined(CONFIG_TRIM_UNUSED_KSYMS)
+               #error CONFIG_TRIM_UNUSED_KSYMS not defined
+               #endif
+       ],[ ],[
+               AC_MSG_RESULT([yes])
+       ],[
+               AC_MSG_RESULT([no])
+               AC_MSG_ERROR([
+       *** This kernel has unused symbols trimming enabled, please disable.
+       *** Rebuild the kernel with CONFIG_TRIM_UNUSED_KSYMS=n set.])
+       ])
+])
+
 dnl #
 dnl # 2.6.39 API compat,
 dnl # The function zlib_deflate_workspacesize() now take 2 arguments.
@@ -1314,6 +1339,55 @@ AC_DEFUN([SPL_AC_RWSEM_SPINLOCK_IS_RAW], [
        EXTRA_KCFLAGS="$tmp_flags"
 ])
 
+dnl #
+dnl # 3.16 API Change
+dnl #
+dnl # rwsem-spinlock "->activity" changed to "->count"
+dnl #
+AC_DEFUN([SPL_AC_RWSEM_ACTIVITY], [
+       AC_MSG_CHECKING([whether struct rw_semaphore has member activity])
+       tmp_flags="$EXTRA_KCFLAGS"
+       EXTRA_KCFLAGS="-Werror"
+       SPL_LINUX_TRY_COMPILE([
+               #include <linux/rwsem.h>
+       ],[
+               struct rw_semaphore dummy_semaphore __attribute__ ((unused));
+               dummy_semaphore.activity = 0;
+       ],[
+               AC_MSG_RESULT(yes)
+               AC_DEFINE(HAVE_RWSEM_ACTIVITY, 1,
+               [struct rw_semaphore has member activity])
+       ],[
+               AC_MSG_RESULT(no)
+       ])
+       EXTRA_KCFLAGS="$tmp_flags"
+])
+
+dnl #
+dnl # 4.8 API Change
+dnl #
+dnl # rwsem "->count" changed to atomic_long_t type
+dnl #
+AC_DEFUN([SPL_AC_RWSEM_ATOMIC_LONG_COUNT], [
+       AC_MSG_CHECKING(
+       [whether struct rw_semaphore has atomic_long_t member count])
+       tmp_flags="$EXTRA_KCFLAGS"
+       EXTRA_KCFLAGS="-Werror"
+       SPL_LINUX_TRY_COMPILE([
+               #include <linux/rwsem.h>
+       ],[
+               DECLARE_RWSEM(dummy_semaphore);
+               (void) atomic_long_read(&dummy_semaphore.count);
+       ],[
+               AC_MSG_RESULT(yes)
+               AC_DEFINE(HAVE_RWSEM_ATOMIC_LONG_COUNT, 1,
+               [struct rw_semaphore has atomic_long_t member count])
+       ],[
+               AC_MSG_RESULT(no)
+       ])
+       EXTRA_KCFLAGS="$tmp_flags"
+])
+
 dnl #
 dnl # 3.9 API change,
 dnl # Moved things from linux/sched.h to linux/sched/rt.h
@@ -1447,3 +1521,56 @@ AC_DEFUN([SPL_AC_WAIT_ON_BIT], [
                AC_MSG_RESULT(no)
        ])
 ])
+
+dnl #
+dnl # 4.7 API change
+dnl # i_mutex is changed to i_rwsem. Instead of directly using
+dnl # i_mutex/i_rwsem, we should use inode_lock() and inode_lock_shared()
+dnl # We test inode_lock_shared because inode_lock is introduced earlier.
+dnl #
+AC_DEFUN([SPL_AC_INODE_LOCK], [
+       AC_MSG_CHECKING([whether inode_lock_shared() exists])
+       tmp_flags="$EXTRA_KCFLAGS"
+       EXTRA_KCFLAGS="-Werror"
+       SPL_LINUX_TRY_COMPILE([
+               #include <linux/fs.h>
+       ],[
+               struct inode *inode = NULL;
+               inode_lock_shared(inode);
+       ],[
+               AC_MSG_RESULT(yes)
+               AC_DEFINE(HAVE_INODE_LOCK_SHARED, 1, [yes])
+       ],[
+               AC_MSG_RESULT(no)
+       ])
+       EXTRA_KCFLAGS="$tmp_flags"
+])
+
+dnl #
+dnl # Check whether mutex has owner with task_struct type.
+dnl #
+dnl # Note that before Linux 3.0, mutex owner is of type thread_info.
+dnl #
+dnl # Note that in Linux 3.18, the condition for owner is changed from
+dnl # defined(CONFIG_DEBUG_MUTEXES) || defined(CONFIG_SMP) to
+dnl # defined(CONFIG_DEBUG_MUTEXES) || defined(CONFIG_MUTEX_SPIN_ON_OWNER)
+dnl #
+AC_DEFUN([SPL_AC_MUTEX_OWNER], [
+       AC_MSG_CHECKING([whether mutex has owner])
+       tmp_flags="$EXTRA_KCFLAGS"
+       EXTRA_KCFLAGS="-Werror"
+       SPL_LINUX_TRY_COMPILE([
+               #include <linux/mutex.h>
+               #include <linux/spinlock.h>
+       ],[
+               DEFINE_MUTEX(m);
+               struct task_struct *t __attribute__ ((unused));
+               t = m.owner;
+       ],[
+               AC_MSG_RESULT(yes)
+               AC_DEFINE(HAVE_MUTEX_OWNER, 1, [yes])
+       ],[
+               AC_MSG_RESULT(no)
+       ])
+       EXTRA_KCFLAGS="$tmp_flags"
+])