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| author | Daniel Vetter <daniel.vetter@ffwll.ch> | 2017-02-01 09:06:26 +0100 |
|---|---|---|
| committer | Daniel Vetter <daniel.vetter@ffwll.ch> | 2017-02-01 09:06:26 +0100 |
| commit | 45bf86e7731606a475b7f989486de23b0784bfe7 (patch) | |
| tree | dac8a776783d6322bedf346060fb6000251c8b40 /arch/x86/entry/entry_32.S | |
| parent | 059c7a5a748d4e7481d8b1b4cf0e182cb81496ad (diff) | |
| parent | 18566acac18f5784347bc5fe636a26897d1c963b (diff) | |
| download | talos-obmc-linux-45bf86e7731606a475b7f989486de23b0784bfe7.tar.gz talos-obmc-linux-45bf86e7731606a475b7f989486de23b0784bfe7.zip | |
Merge remote-tracking branch 'airlied/drm-next' into drm-misc-next
Backmerge to resync and also so that Ville can apply a cleanup patch
from Takashi.
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Diffstat (limited to 'arch/x86/entry/entry_32.S')
| -rw-r--r-- | arch/x86/entry/entry_32.S | 30 |
1 files changed, 11 insertions, 19 deletions
diff --git a/arch/x86/entry/entry_32.S b/arch/x86/entry/entry_32.S index 701d29f8e4d3..57f7ec35216e 100644 --- a/arch/x86/entry/entry_32.S +++ b/arch/x86/entry/entry_32.S @@ -255,23 +255,6 @@ ENTRY(__switch_to_asm) END(__switch_to_asm) /* - * The unwinder expects the last frame on the stack to always be at the same - * offset from the end of the page, which allows it to validate the stack. - * Calling schedule_tail() directly would break that convention because its an - * asmlinkage function so its argument has to be pushed on the stack. This - * wrapper creates a proper "end of stack" frame header before the call. - */ -ENTRY(schedule_tail_wrapper) - FRAME_BEGIN - - pushl %eax - call schedule_tail - popl %eax - - FRAME_END - ret -ENDPROC(schedule_tail_wrapper) -/* * A newly forked process directly context switches into this address. * * eax: prev task we switched from @@ -279,15 +262,24 @@ ENDPROC(schedule_tail_wrapper) * edi: kernel thread arg */ ENTRY(ret_from_fork) - call schedule_tail_wrapper + FRAME_BEGIN /* help unwinder find end of stack */ + + /* + * schedule_tail() is asmlinkage so we have to put its 'prev' argument + * on the stack. + */ + pushl %eax + call schedule_tail + popl %eax testl %ebx, %ebx jnz 1f /* kernel threads are uncommon */ 2: /* When we fork, we trace the syscall return in the child, too. */ - movl %esp, %eax + leal FRAME_OFFSET(%esp), %eax call syscall_return_slowpath + FRAME_END jmp restore_all /* kernel thread */ |
