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| author | Ingo Molnar <mingo@elte.hu> | 2010-05-07 11:27:54 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2010-05-07 11:27:54 +0200 |
| commit | 48652ced1533c3372f996a0d83b6e73b1f1c9381 (patch) | |
| tree | 5e17729cfcdc97bf798a17b57cdb888b4ded65b0 /arch/sparc/kernel/rtrap_64.S | |
| parent | 99bd5e2f245d8cd17d040c82d40becdb3efd9b69 (diff) | |
| parent | 66f41d4c5c8a5deed66fdcc84509376c9a0bf9d8 (diff) | |
| download | talos-op-linux-48652ced1533c3372f996a0d83b6e73b1f1c9381.tar.gz talos-op-linux-48652ced1533c3372f996a0d83b6e73b1f1c9381.zip | |
Merge commit 'v2.6.34-rc6' into sched/core
Diffstat (limited to 'arch/sparc/kernel/rtrap_64.S')
| -rw-r--r-- | arch/sparc/kernel/rtrap_64.S | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/arch/sparc/kernel/rtrap_64.S b/arch/sparc/kernel/rtrap_64.S index 83f1873c6c13..090b9e9ad5e3 100644 --- a/arch/sparc/kernel/rtrap_64.S +++ b/arch/sparc/kernel/rtrap_64.S @@ -130,7 +130,17 @@ rtrap_xcall: nop call trace_hardirqs_on nop - wrpr %l4, %pil + /* Do not actually set the %pil here. We will do that + * below after we clear PSTATE_IE in the %pstate register. + * If we re-enable interrupts here, we can recurse down + * the hardirq stack potentially endlessly, causing a + * stack overflow. + * + * It is tempting to put this test and trace_hardirqs_on + * call at the 'rt_continue' label, but that will not work + * as that path hits unconditionally and we do not want to + * execute this in NMI return paths, for example. + */ #endif rtrap_no_irq_enable: andcc %l1, TSTATE_PRIV, %l3 |
