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| author | David S. Miller <davem@davemloft.net> | 2008-11-25 22:24:59 -0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2008-12-04 09:17:03 -0800 |
| commit | 5565736e44fff06dc5f5c6559e04ac58d2d560ab (patch) | |
| tree | 08fd6982f1659a4a77439aa19498297e226b1b1b /arch | |
| parent | b4f4372f96e0573d752d9e45beda02fabf716cc8 (diff) | |
| download | lwn-5565736e44fff06dc5f5c6559e04ac58d2d560ab.tar.gz lwn-5565736e44fff06dc5f5c6559e04ac58d2d560ab.zip | |
sparc64: Make special trap return path for TRAP_NMI().
We don't want the rtrap path to try and run softirqs or
anything like that when returning from a PIL==15 NMI.
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/sparc/include/asm/ttable.h | 2 | ||||
| -rw-r--r-- | arch/sparc64/kernel/rtrap.S | 14 |
2 files changed, 14 insertions, 2 deletions
diff --git a/arch/sparc/include/asm/ttable.h b/arch/sparc/include/asm/ttable.h index bb2c0770a6ac..48f2807d3265 100644 --- a/arch/sparc/include/asm/ttable.h +++ b/arch/sparc/include/asm/ttable.h @@ -162,7 +162,7 @@ mov level, %o0; \ call routine; \ add %sp, PTREGS_OFF, %o1; \ - ba,a,pt %xcc, rtrap_irq; + ba,a,pt %xcc, rtrap_nmi; #define TRAP_IVEC TRAP_NOSAVE(do_ivec) diff --git a/arch/sparc64/kernel/rtrap.S b/arch/sparc64/kernel/rtrap.S index 6892cf556f45..fd3cee4d117c 100644 --- a/arch/sparc64/kernel/rtrap.S +++ b/arch/sparc64/kernel/rtrap.S @@ -132,6 +132,18 @@ __handle_signal: ba,pt %xcc, __handle_signal_continue andn %l1, %l4, %l1 + /* When returning from a NMI (%pil==15) interrupt we want to + * avoid running softirqs, doing IRQ tracing, preempting, etc. + */ + .globl rtrap_nmi +rtrap_nmi: ldx [%sp + PTREGS_OFF + PT_V9_TSTATE], %l1 + sethi %hi(0xf << 20), %l4 + and %l1, %l4, %l4 + andn %l1, %l4, %l1 + srl %l4, 20, %l4 + ba,pt %xcc, rtrap_no_irq_enable + wrpr %l4, %pil + .align 64 .globl rtrap_irq, rtrap, irqsz_patchme, rtrap_xcall rtrap_irq: @@ -161,8 +173,8 @@ rtrap_xcall: call trace_hardirqs_on nop wrpr %l4, %pil -rtrap_no_irq_enable: #endif +rtrap_no_irq_enable: andcc %l1, TSTATE_PRIV, %l3 bne,pn %icc, to_kernel nop |