x86: ret_from_fork - get rid of jump back

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Impact: remove dead code

If we take a closer look at the rff_trace/rff_action ret_from_fork code,
we have to realize that it does all the wrong things: for example it
checks the TIF flag - while later on jumping back to the ret-from-syscall
path - duplicating the check needlessly.

But checking for _TIF_SYSCALL_TRACE is completely unnecessary here because
we clear that flag for every freshly forked task. So the whole "tracing"
code here, for which there is a out of line jump optimization that makes
it even harder to read, is in reality completely dead code ...

Reported-by: Cyrill Gorcunov <gorcunov@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Tested-by: Cyrill Gorcunov <gorcunov@gmail.com>

...

This commit is contained in:

Ingo Molnar 2008-11-27 14:41:21 +01:00

parent 3bdae4f464

commit 5b3eec0c80

1 changed files with 16 additions and 15 deletions

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arch/x86/kernel/entry_64.S

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