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@xxxxxxxxxxxxx> --- arch/sparc/include/asm/ttable.h | 2 +- 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 bb2c077..48f2807 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 6892cf5..fd3cee4 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 -- 1.5.6.5 -- To unsubscribe from this list: send the line "unsubscribe sparclinux" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
