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Add autoconf checks for atomic64_cmpxchg + atomic64_xchg

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These functions didn't exist for all archs prior to 2.6.24.  This
patch addes an autoconf test to detect this and add them when needed.
The autoconf check is needed instead of just an #ifndef because in
the most modern kernels atomic64_{cmp}xchg are implemented as in
inline function and not a #define.
This commit is contained in:
Brian Behlendorf
2009-10-30 13:53:17 -07:00
parent 5e9b5d832b
commit 302b88e6ab
5 changed files with 311 additions and 0 deletions
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config/spl-build.m4
+40
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@@ -28,6 +28,8 @@ AC_DEFUN([SPL_AC_CONFIG_KERNEL], [
SPL_AC_ATOMIC_SPINLOCK
SPL_AC_TYPE_UINTPTR_T
SPL_AC_TYPE_ATOMIC64_T
SPL_AC_TYPE_ATOMIC64_CMPXCHG
SPL_AC_TYPE_ATOMIC64_XCHG
SPL_AC_3ARGS_INIT_WORK
SPL_AC_2ARGS_REGISTER_SYSCTL
SPL_AC_SET_SHRINKER
@@ -488,6 +490,44 @@ AC_DEFUN([SPL_AC_TYPE_ATOMIC64_T],
])
])
dnl #
dnl # 2.6.24 API change,
dnl # check if atomic64_cmpxchg is defined
dnl #
AC_DEFUN([SPL_AC_TYPE_ATOMIC64_CMPXCHG],
[AC_MSG_CHECKING([whether kernel defines atomic64_cmpxchg])
SPL_LINUX_TRY_COMPILE([
#include <asm/atomic.h>
],[
atomic64_cmpxchg((atomic64_t *)NULL, 0, 0);
],[
AC_MSG_RESULT([yes])
AC_DEFINE(HAVE_ATOMIC64_CMPXCHG, 1,
[kernel defines atomic64_cmpxchg])
],[
AC_MSG_RESULT([no])
])
])
dnl #
dnl # 2.6.24 API change,
dnl # check if atomic64_xchg is defined
dnl #
AC_DEFUN([SPL_AC_TYPE_ATOMIC64_XCHG],
[AC_MSG_CHECKING([whether kernel defines atomic64_xchg])
SPL_LINUX_TRY_COMPILE([
#include <asm/atomic.h>
],[
atomic64_xchg((atomic64_t *)NULL, 0);
],[
AC_MSG_RESULT([yes])
AC_DEFINE(HAVE_ATOMIC64_XCHG, 1,
[kernel defines atomic64_xchg])
],[
AC_MSG_RESULT([no])
])
])
dnl #
dnl # 2.6.20 API change,
dnl # INIT_WORK use 2 args and not store data inside