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| author | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2013-09-23 06:29:11 +0200 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2013-09-25 06:15:36 +0200 |
| commit | 0366a1c70b89efed4f9d590216bb004a16effbed (patch) | |
| tree | 5090ad127863968876119f1bb022a7bce32842ab /arch/powerpc/kernel/misc_32.S | |
| parent | Linux 3.12-rc2 (diff) | |
| download | linux-0366a1c70b89efed4f9d590216bb004a16effbed.tar.xz linux-0366a1c70b89efed4f9d590216bb004a16effbed.zip | |
powerpc/irq: Run softirqs off the top of the irq stack
Nowadays, irq_exit() calls __do_softirq() pretty much directly
instead of calling do_softirq() which switches to the decicated
softirq stack.
This has lead to observed stack overflows on powerpc since we call
irq_enter() and irq_exit() outside of the scope that switches to
the irq stack.
This fixes it by moving the stack switching up a level, making
irq_enter() and irq_exit() run off the irq stack.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/kernel/misc_32.S')
| -rw-r--r-- | arch/powerpc/kernel/misc_32.S | 9 |
1 files changed, 4 insertions, 5 deletions
diff --git a/arch/powerpc/kernel/misc_32.S b/arch/powerpc/kernel/misc_32.S index 777d999f563b..7da3882a3622 100644 --- a/arch/powerpc/kernel/misc_32.S +++ b/arch/powerpc/kernel/misc_32.S @@ -47,13 +47,12 @@ _GLOBAL(call_do_softirq) mtlr r0 blr -_GLOBAL(call_handle_irq) +_GLOBAL(call_do_irq) mflr r0 stw r0,4(r1) - mtctr r6 - stwu r1,THREAD_SIZE-STACK_FRAME_OVERHEAD(r5) - mr r1,r5 - bctrl + stwu r1,THREAD_SIZE-STACK_FRAME_OVERHEAD(r4) + mr r1,r4 + bl __do_irq lwz r1,0(r1) lwz r0,4(r1) mtlr r0 |