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Add compatibility layer for {kmap,kunmap}_atomic

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Starting from linux-2.6.37, {kmap,kunmap}_atomic takes 1 argument instead of 2.
We use zfs_{kmap,kunmap}_atomic as wrappers and always take 2 argument, but
ignore the 2nd for newer kernel.

Signed-off-by: Chunwei Chen <tuxoko@gmail.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
This commit is contained in:
Chunwei Chen
2015-05-11 22:22:56 +08:00
committed by Brian Behlendorf
parent efc412b645
commit 17888ae30d
4 changed files with 63 additions and 1 deletions
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config/kernel-kmap-atomic-args.m4
+20
View File
@@ -0,0 +1,20 @@
dnl #
dnl # 2.6.37 API change
dnl # kmap_atomic changed from assigning hard-coded named slot to using
dnl # push/pop based dynamical allocation.
dnl #
AC_DEFUN([ZFS_AC_KERNEL_KMAP_ATOMIC_ARGS], [
AC_MSG_CHECKING([whether kmap_atomic wants 1 args])
ZFS_LINUX_TRY_COMPILE([
#include <linux/pagemap.h>
],[
struct page page;
kmap_atomic(&page);
],[
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_1ARG_KMAP_ATOMIC, 1,
[kmap_atomic wants 1 args])
],[
AC_MSG_RESULT(no)
])
])