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| author | Will Deacon <will.deacon@arm.com> | 2012-07-06 15:48:50 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2012-07-09 17:44:12 +0100 |
| commit | 64284a9f8a91b2f1af577f78fabe05d8072cb6e6 (patch) | |
| tree | 32858767cf85268a71966da4d5fb5719b4b0b15b /arch | |
| parent | 8f827a1468c51c82443a78d15e67fe92022cd5b9 (diff) | |
| download | op-kernel-dev-64284a9f8a91b2f1af577f78fabe05d8072cb6e6.zip op-kernel-dev-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')
| -rw-r--r-- | arch/arm/kernel/entry-common.S | 6 |
1 files changed, 0 insertions, 6 deletions
diff --git a/arch/arm/kernel/entry-common.S b/arch/arm/kernel/entry-common.S index 4afed88..10911c9 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) |
