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Fix HAVE_FS_STRUCT_SPINLOCK check for gcc-4.1.2

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Older versions of gcc (gcc-4.1.2) will treat an 'incompatible
pointer type' as a warning instead of an error.  This results
in HAVE_FS_STRUCT_SPINLOCK being defined incorrectly.  This
failure mode was observed when using a RHEL6 2.6.32 based kernel
under RHEL5.5 which contains the old version of gcc.  To resolve
the issue the warning is explicitly promoted to an error.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
This commit is contained in:
Brian Behlendorf 2011-09-19 13:35:03 -07:00
parent c064bdee95
commit 97fd6a07c2
2 changed files with 9 additions and 0 deletions
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3
config/spl-build.m4
View File

@ -1598,6 +1598,8 @@ dnl # a spinlock_t to improve the fastpath performance.
dnl #
AC_DEFUN([SPL_AC_FS_STRUCT_SPINLOCK], [
AC_MSG_CHECKING([whether struct fs_struct uses spinlock_t])
tmp_flags="$EXTRA_KCFLAGS"
EXTRA_KCFLAGS="-Werror"
SPL_LINUX_TRY_COMPILE([
#include <linux/sched.h>
#include <linux/fs_struct.h>
@ -1611,6 +1613,7 @@ AC_DEFUN([SPL_AC_FS_STRUCT_SPINLOCK], [
],[
AC_MSG_RESULT(no)
])
EXTRA_KCFLAGS="$tmp_flags"
])
dnl #

6
configure vendored
View File

@ -15069,6 +15069,8 @@ fi
{ $as_echo "$as_me:$LINENO: checking whether struct fs_struct uses spinlock_t" >&5
$as_echo_n "checking whether struct fs_struct uses spinlock_t... " >&6; }
tmp_flags="$EXTRA_KCFLAGS"
EXTRA_KCFLAGS="-Werror"
cat confdefs.h - <<_ACEOF >conftest.c
@ -15132,6 +15134,7 @@ fi
rm -Rf build
EXTRA_KCFLAGS="$tmp_flags"
{ $as_echo "$as_me:$LINENO: checking whether struct cred exists" >&5
@ -19267,6 +19270,8 @@ fi
{ $as_echo "$as_me:$LINENO: checking whether struct fs_struct uses spinlock_t" >&5
$as_echo_n "checking whether struct fs_struct uses spinlock_t... " >&6; }
tmp_flags="$EXTRA_KCFLAGS"
EXTRA_KCFLAGS="-Werror"
cat confdefs.h - <<_ACEOF >conftest.c
@ -19330,6 +19335,7 @@ fi
rm -Rf build
EXTRA_KCFLAGS="$tmp_flags"
{ $as_echo "$as_me:$LINENO: checking whether struct cred exists" >&5