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Add autoconf checks for atomic64_cmpxchg + atomic64_xchg
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
parent
5e9b5d832b
commit
302b88e6ab
@ -28,6 +28,8 @@ AC_DEFUN([SPL_AC_CONFIG_KERNEL], [
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SPL_AC_ATOMIC_SPINLOCK
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SPL_AC_TYPE_UINTPTR_T
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SPL_AC_TYPE_ATOMIC64_T
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SPL_AC_TYPE_ATOMIC64_CMPXCHG
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SPL_AC_TYPE_ATOMIC64_XCHG
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SPL_AC_3ARGS_INIT_WORK
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SPL_AC_2ARGS_REGISTER_SYSCTL
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SPL_AC_SET_SHRINKER
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@ -488,6 +490,44 @@ AC_DEFUN([SPL_AC_TYPE_ATOMIC64_T],
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])
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])
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dnl #
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dnl # 2.6.24 API change,
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dnl # check if atomic64_cmpxchg is defined
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dnl #
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AC_DEFUN([SPL_AC_TYPE_ATOMIC64_CMPXCHG],
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[AC_MSG_CHECKING([whether kernel defines atomic64_cmpxchg])
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SPL_LINUX_TRY_COMPILE([
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#include <asm/atomic.h>
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],[
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atomic64_cmpxchg((atomic64_t *)NULL, 0, 0);
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],[
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AC_MSG_RESULT([yes])
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AC_DEFINE(HAVE_ATOMIC64_CMPXCHG, 1,
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[kernel defines atomic64_cmpxchg])
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],[
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AC_MSG_RESULT([no])
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])
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])
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dnl #
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dnl # 2.6.24 API change,
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dnl # check if atomic64_xchg is defined
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dnl #
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AC_DEFUN([SPL_AC_TYPE_ATOMIC64_XCHG],
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[AC_MSG_CHECKING([whether kernel defines atomic64_xchg])
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SPL_LINUX_TRY_COMPILE([
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#include <asm/atomic.h>
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],[
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atomic64_xchg((atomic64_t *)NULL, 0);
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],[
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AC_MSG_RESULT([yes])
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AC_DEFINE(HAVE_ATOMIC64_XCHG, 1,
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[kernel defines atomic64_xchg])
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],[
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AC_MSG_RESULT([no])
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])
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])
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dnl #
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dnl # 2.6.20 API change,
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dnl # INIT_WORK use 2 args and not store data inside
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256
configure
vendored
256
configure
vendored
@ -19350,6 +19350,134 @@ echo "${ECHO_T}no" >&6
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fi
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rm -Rf build
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echo "$as_me:$LINENO: checking whether kernel defines atomic64_cmpxchg" >&5
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echo $ECHO_N "checking whether kernel defines atomic64_cmpxchg... $ECHO_C" >&6
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cat >conftest.c <<_ACEOF
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/* confdefs.h. */
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_ACEOF
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cat confdefs.h >>conftest.$ac_ext
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cat >>conftest.$ac_ext <<_ACEOF
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/* end confdefs.h. */
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#include <asm/atomic.h>
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int
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main (void)
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{
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atomic64_cmpxchg((atomic64_t *)NULL, 0, 0);
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;
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return 0;
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}
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_ACEOF
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rm -Rf build && mkdir -p build
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echo "obj-m := conftest.o" >build/Makefile
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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'
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{ (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
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(eval $ac_try) 2>&5
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ac_status=$?
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echo "$as_me:$LINENO: \$? = $ac_status" >&5
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(exit $ac_status); }; } >/dev/null && { ac_try='test -s build/conftest.o'
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{ (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
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(eval $ac_try) 2>&5
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ac_status=$?
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echo "$as_me:$LINENO: \$? = $ac_status" >&5
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(exit $ac_status); }; }; then
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echo "$as_me:$LINENO: result: yes" >&5
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echo "${ECHO_T}yes" >&6
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cat >>confdefs.h <<\_ACEOF
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#define HAVE_ATOMIC64_CMPXCHG 1
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_ACEOF
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else
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echo "$as_me: failed program was:" >&5
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sed 's/^/| /' conftest.$ac_ext >&5
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echo "$as_me:$LINENO: result: no" >&5
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echo "${ECHO_T}no" >&6
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fi
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rm -Rf build
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echo "$as_me:$LINENO: checking whether kernel defines atomic64_xchg" >&5
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echo $ECHO_N "checking whether kernel defines atomic64_xchg... $ECHO_C" >&6
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cat >conftest.c <<_ACEOF
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/* confdefs.h. */
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_ACEOF
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cat confdefs.h >>conftest.$ac_ext
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cat >>conftest.$ac_ext <<_ACEOF
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/* end confdefs.h. */
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#include <asm/atomic.h>
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int
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main (void)
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{
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atomic64_xchg((atomic64_t *)NULL, 0);
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;
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return 0;
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}
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_ACEOF
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rm -Rf build && mkdir -p build
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echo "obj-m := conftest.o" >build/Makefile
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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'
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{ (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
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(eval $ac_try) 2>&5
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ac_status=$?
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echo "$as_me:$LINENO: \$? = $ac_status" >&5
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(exit $ac_status); }; } >/dev/null && { ac_try='test -s build/conftest.o'
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{ (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
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(eval $ac_try) 2>&5
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ac_status=$?
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echo "$as_me:$LINENO: \$? = $ac_status" >&5
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(exit $ac_status); }; }; then
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echo "$as_me:$LINENO: result: yes" >&5
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echo "${ECHO_T}yes" >&6
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cat >>confdefs.h <<\_ACEOF
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#define HAVE_ATOMIC64_XCHG 1
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_ACEOF
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else
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echo "$as_me: failed program was:" >&5
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sed 's/^/| /' conftest.$ac_ext >&5
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echo "$as_me:$LINENO: result: no" >&5
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echo "${ECHO_T}no" >&6
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fi
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rm -Rf build
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@ -22521,6 +22649,134 @@ echo "${ECHO_T}no" >&6
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fi
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rm -Rf build
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echo "$as_me:$LINENO: checking whether kernel defines atomic64_cmpxchg" >&5
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echo $ECHO_N "checking whether kernel defines atomic64_cmpxchg... $ECHO_C" >&6
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cat >conftest.c <<_ACEOF
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/* confdefs.h. */
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_ACEOF
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cat confdefs.h >>conftest.$ac_ext
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cat >>conftest.$ac_ext <<_ACEOF
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/* end confdefs.h. */
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#include <asm/atomic.h>
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int
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main (void)
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{
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atomic64_cmpxchg((atomic64_t *)NULL, 0, 0);
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;
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return 0;
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}
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_ACEOF
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rm -Rf build && mkdir -p build
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echo "obj-m := conftest.o" >build/Makefile
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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'
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{ (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
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(eval $ac_try) 2>&5
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ac_status=$?
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echo "$as_me:$LINENO: \$? = $ac_status" >&5
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(exit $ac_status); }; } >/dev/null && { ac_try='test -s build/conftest.o'
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{ (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
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(eval $ac_try) 2>&5
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ac_status=$?
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echo "$as_me:$LINENO: \$? = $ac_status" >&5
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(exit $ac_status); }; }; then
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echo "$as_me:$LINENO: result: yes" >&5
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echo "${ECHO_T}yes" >&6
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cat >>confdefs.h <<\_ACEOF
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#define HAVE_ATOMIC64_CMPXCHG 1
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_ACEOF
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else
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echo "$as_me: failed program was:" >&5
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sed 's/^/| /' conftest.$ac_ext >&5
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echo "$as_me:$LINENO: result: no" >&5
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echo "${ECHO_T}no" >&6
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fi
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rm -Rf build
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echo "$as_me:$LINENO: checking whether kernel defines atomic64_xchg" >&5
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echo $ECHO_N "checking whether kernel defines atomic64_xchg... $ECHO_C" >&6
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cat >conftest.c <<_ACEOF
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/* confdefs.h. */
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_ACEOF
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cat confdefs.h >>conftest.$ac_ext
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cat >>conftest.$ac_ext <<_ACEOF
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/* end confdefs.h. */
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#include <asm/atomic.h>
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int
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main (void)
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{
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atomic64_xchg((atomic64_t *)NULL, 0);
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;
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return 0;
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}
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_ACEOF
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rm -Rf build && mkdir -p build
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echo "obj-m := conftest.o" >build/Makefile
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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'
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{ (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
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(eval $ac_try) 2>&5
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ac_status=$?
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echo "$as_me:$LINENO: \$? = $ac_status" >&5
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(exit $ac_status); }; } >/dev/null && { ac_try='test -s build/conftest.o'
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{ (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
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(eval $ac_try) 2>&5
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ac_status=$?
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echo "$as_me:$LINENO: \$? = $ac_status" >&5
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(exit $ac_status); }; }; then
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echo "$as_me:$LINENO: result: yes" >&5
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echo "${ECHO_T}yes" >&6
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cat >>confdefs.h <<\_ACEOF
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#define HAVE_ATOMIC64_XCHG 1
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_ACEOF
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else
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echo "$as_me: failed program was:" >&5
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sed 's/^/| /' conftest.$ac_ext >&5
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echo "$as_me:$LINENO: result: no" >&5
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echo "${ECHO_T}no" >&6
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fi
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rm -Rf build
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@ -55,5 +55,13 @@ static inline void atomic64_set(atomic64_t *v, __s64 i)
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#endif /* HAVE_ATOMIC64_T */
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#ifndef HAVE_ATOMIC64_CMPXCHG
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#define atomic64_cmpxchg(v, o, n) (cmpxchg(&((v)->counter), (o), (n)))
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#endif
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#ifndef HAVE_ATOMIC64_XCHG
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#define atomic64_xchg(v, n) (xchg(&((v)->counter), n))
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#endif
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#endif /* _SPL_ATOMIC_COMPAT_H */
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@ -30,6 +30,7 @@
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#include <linux/module.h>
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#include <linux/spinlock.h>
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#include <sys/types.h>
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#include <asm/atomic_compat.h>
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/*
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* Two approaches to atomic operations are implemented each with its
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@ -33,9 +33,15 @@
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/* device_create wants 5 args */
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#undef HAVE_5ARGS_DEVICE_CREATE
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/* kernel defines atomic64_cmpxchg */
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#undef HAVE_ATOMIC64_CMPXCHG
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/* kernel defines atomic64_t */
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#undef HAVE_ATOMIC64_T
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/* kernel defines atomic64_xchg */
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#undef HAVE_ATOMIC64_XCHG
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/* class_device_create() is available */
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#undef HAVE_CLASS_DEVICE_CREATE
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