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authorWill Deacon <will.deacon@arm.com>2012-07-06 15:48:50 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2012-07-09 17:44:12 +0100
commit64284a9f8a91b2f1af577f78fabe05d8072cb6e6 (patch)
tree32858767cf85268a71966da4d5fb5719b4b0b15b /arch/arm/kernel/entry-common.S
parent8f827a1468c51c82443a78d15e67fe92022cd5b9 (diff)
downloadlinux-linaro-stable-64284a9f8a91b2f1af577f78fabe05d8072cb6e6.tar.gz
ARM: 7454/1: entry: don't bother with syscall tracing on ret_from_fork path
ret_from_fork is setup for a freshly spawned child task via copy_thread, called from copy_process. The latter function clears TIF_SYSCALL_TRACE and also resets the child task's audit_context to NULL, meaning that there is little point invoking the system call tracing routines. Furthermore, getting hold of the syscall number is a complete pain and it looks like the current code doesn't even bother. This patch removes the syscall tracing checks from ret_from_fork. Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/kernel/entry-common.S')
-rw-r--r--arch/arm/kernel/entry-common.S6
1 files changed, 0 insertions, 6 deletions
diff --git a/arch/arm/kernel/entry-common.S b/arch/arm/kernel/entry-common.S
index 4afed88d250a..10911c93fbf1 100644
--- a/arch/arm/kernel/entry-common.S
+++ b/arch/arm/kernel/entry-common.S
@@ -95,13 +95,7 @@ ENDPROC(ret_to_user)
ENTRY(ret_from_fork)
bl schedule_tail
get_thread_info tsk
- ldr r1, [tsk, #TI_FLAGS] @ check for syscall tracing
mov why, #1
- tst r1, #_TIF_SYSCALL_WORK @ are we tracing syscalls?
- beq ret_slow_syscall
- mov r1, sp
- mov r0, #1 @ trace exit [IP = 1]
- bl syscall_trace
b ret_slow_syscall
ENDPROC(ret_from_fork)