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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_64.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_64.S')
| -rw-r--r-- | arch/powerpc/kernel/misc_64.S | 10 |
1 files changed, 4 insertions, 6 deletions
diff --git a/arch/powerpc/kernel/misc_64.S b/arch/powerpc/kernel/misc_64.S index 971d7e78aff2..e59caf874d05 100644 --- a/arch/powerpc/kernel/misc_64.S +++ b/arch/powerpc/kernel/misc_64.S @@ -40,14 +40,12 @@ _GLOBAL(call_do_softirq) mtlr r0 blr -_GLOBAL(call_handle_irq) - ld r8,0(r6) +_GLOBAL(call_do_irq) mflr r0 std r0,16(r1) - mtctr r8 - stdu r1,THREAD_SIZE-STACK_FRAME_OVERHEAD(r5) - mr r1,r5 - bctrl + stdu r1,THREAD_SIZE-STACK_FRAME_OVERHEAD(r4) + mr r1,r4 + bl .__do_irq ld r1,0(r1) ld r0,16(r1) mtlr r0 |