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authorCatalin Marinas <catalin.marinas@arm.com>2012-12-17 16:01:45 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2012-12-17 17:15:18 -0800
commit0ad50c3896afbb3c103409a18260e601b87a744c (patch)
tree3a59c1e90b3ee62daf18bc9689cf454a31f164be /arch/powerpc/kernel
parent918854a65e856574523d94763ef2a2b48ad55a25 (diff)
downloadlinaro-lsk-0ad50c3896afbb3c103409a18260e601b87a744c.tar.gz
compat: generic compat_sys_sched_rr_get_interval() implementation
This function is used by sparc, powerpc tile and arm64 for compat support. The patch adds a generic implementation with a wrapper for PowerPC to do the u32->int sign extension. The reason for a single patch covering powerpc, tile, sparc and arm64 is to keep it bisectable, otherwise kernel building may fail with mismatched function declarations. Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Chris Metcalf <cmetcalf@tilera.com> [for tile] Acked-by: David S. Miller <davem@davemloft.net> Acked-by: Arnd Bergmann <arnd@arndb.de> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Alexander Viro <viro@zeniv.linux.org.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/powerpc/kernel')
-rw-r--r--arch/powerpc/kernel/sys_ppc32.c17
1 files changed, 4 insertions, 13 deletions
diff --git a/arch/powerpc/kernel/sys_ppc32.c b/arch/powerpc/kernel/sys_ppc32.c
index 9c2ed90ece8..8a93778ed9f 100644
--- a/arch/powerpc/kernel/sys_ppc32.c
+++ b/arch/powerpc/kernel/sys_ppc32.c
@@ -175,19 +175,10 @@ asmlinkage long compat_sys_prctl(u32 option, u32 arg2, u32 arg3, u32 arg4, u32 a
* proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
* and the register representation of a signed int (msr in 64-bit mode) is performed.
*/
-asmlinkage long compat_sys_sched_rr_get_interval(u32 pid, struct compat_timespec __user *interval)
-{
- struct timespec t;
- int ret;
- mm_segment_t old_fs = get_fs ();
-
- /* The __user pointer cast is valid because of the set_fs() */
- set_fs (KERNEL_DS);
- ret = sys_sched_rr_get_interval((int)pid, (struct timespec __user *) &t);
- set_fs (old_fs);
- if (put_compat_timespec(&t, interval))
- return -EFAULT;
- return ret;
+asmlinkage long compat_sys_sched_rr_get_interval_wrapper(u32 pid,
+ struct compat_timespec __user *interval)
+{
+ return compat_sys_sched_rr_get_interval((int)pid, interval);
}
/* Note: it is necessary to treat mode as an unsigned int,