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ARM: 7454/1: entry: don't bother with syscall tracing on ret_from_fork path

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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>
This commit is contained in:
Will Deacon 2012-07-06 15:48:50 +01:00 committed by Russell King
parent 8f827a1468
commit 64284a9f8a
1 changed files with 0 additions and 6 deletions
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6
arch/arm/kernel/entry-common.S
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@ -95,13 +95,7 @@ ENDPROC(ret_to_user)
ENTRY(ret_from_fork) ENTRY(ret_from_fork)
bl schedule_tail bl schedule_tail
get_thread_info tsk get_thread_info tsk
ldr r1, [tsk, #TI_FLAGS] @ check for syscall tracing
mov why, #1 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 b ret_slow_syscall
ENDPROC(ret_from_fork) ENDPROC(ret_from_fork)