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Linux 2.6.39 compat: Test if kstrtoul() exists 

kstrtoul() exists only after torvalds/linux@33ee3b2e2e in 2.6.39.
Use strict_strtoul() if kstrtoul() doesn't exist.
Note that strict_strtoul() has existed as an alias for kstrtoul()
for a while, but removed in torvalds/linux@3db2e9cdc0.

It looks like RHEL6 (2.6.32 based) has backported kstrtoul(),
and this caused build CI to pass compilation test.
It should fail on vanilla < 2.6.39 kernels or distro kernels without
backport as reported in #8760.

--
 # grep "kstrtoul(" /lib/modules/2.6.32-754.12.1.el6.x86_64/build/ \
 include/linux/kernel.h >/dev/null
 # echo $?
 0

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: loli10K <ezomori.nozomu@gmail.com>
Signed-off-by: Tomohiro Kusumi <kusumi.tomohiro@gmail.com>
Closes #8760 
Closes #8761
This commit is contained in:
Tomohiro Kusumi 2019-05-25 04:26:18 +09:00 committed by Brian Behlendorf
parent 2e8c315fc6
commit 8708fd888f
3 changed files with 26 additions and 0 deletions
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21
config/kernel-kstrtoul.m4 Normal file
View File

@ -0,0 +1,21 @@
dnl #
dnl # 2.6.39 API change
dnl #
dnl # 33ee3b2e2eb9 kstrto*: converting strings to integers done (hopefully) right
dnl #
dnl # If kstrtoul() doesn't exist, fallback to use strict_strtoul() which has
dnl # existed since 2.6.25.
dnl #
AC_DEFUN([ZFS_AC_KERNEL_KSTRTOUL], [
AC_MSG_CHECKING([whether kstrtoul() exists])
ZFS_LINUX_TRY_COMPILE([
#include <linux/kernel.h>
],[
int ret __attribute__ ((unused)) = kstrtoul(NULL, 10, NULL);
],[
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_KSTRTOUL, 1, [kstrtoul() exists])
],[
AC_MSG_RESULT(no)
])
])

1
config/kernel.m4
View File

@ -167,6 +167,7 @@ AC_DEFUN([ZFS_AC_CONFIG_KERNEL], [
ZFS_AC_KERNEL_TOTALHIGH_PAGES
ZFS_AC_KERNEL_BLK_QUEUE_DISCARD
ZFS_AC_KERNEL_BLK_QUEUE_SECURE_ERASE
ZFS_AC_KERNEL_KSTRTOUL
AS_IF([test "$LINUX_OBJ" != "$LINUX"], [
KERNEL_MAKE="$KERNEL_MAKE O=$LINUX_OBJ"

4
include/spl/sys/strings.h
View File

@ -28,4 +28,8 @@
#define bcopy(src, dest, size) memmove(dest, src, size)
#define bcmp(src, dest, size) memcmp((src), (dest), (size_t)(size))
#ifndef HAVE_KSTRTOUL
#define kstrtoul strict_strtoul
#endif
#endif /* _SPL_SYS_STRINGS_H */