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| author | Rob Gardner <rob.gardner@oracle.com> | 2015-12-22 07:48:03 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2015-12-24 20:07:16 +0300 |
| commit | 1ca04a4ce0d5131471c5a1fac76899dc2d9d3f36 (patch) | |
| tree | 7e2f8aad1841ce369234d6de9c522b545bedf6aa /arch | |
| parent | 82924e542f20e645bc7de86e2889fe3fb0858566 (diff) | |
| download | linux-1ca04a4ce0d5131471c5a1fac76899dc2d9d3f36.tar.xz | |
sparc64: Don't set %pil in rtrap_nmi too early
Commit 28a1f53 delays setting %pil to avoid potential
hardirq stack overflow in the common rtrap_irq path.
Setting %pil also needs to be delayed in the rtrap_nmi
path for the same reason.
Signed-off-by: Rob Gardner <rob.gardner@oracle.com>
Signed-off-by: Dave Aldridge <david.j.aldridge@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/sparc/kernel/rtrap_64.S | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/arch/sparc/kernel/rtrap_64.S b/arch/sparc/kernel/rtrap_64.S index 39f0c662f4c8..d08bdaffdbfc 100644 --- a/arch/sparc/kernel/rtrap_64.S +++ b/arch/sparc/kernel/rtrap_64.S @@ -73,7 +73,13 @@ rtrap_nmi: ldx [%sp + PTREGS_OFF + PT_V9_TSTATE], %l1 andn %l1, %l4, %l1 srl %l4, 20, %l4 ba,pt %xcc, rtrap_no_irq_enable - wrpr %l4, %pil + nop + /* 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. + */ .align 64 .globl rtrap_irq, rtrap, irqsz_patchme, rtrap_xcall |