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authorDavid S. Miller <davem@davemloft.net>2008-11-25 22:24:59 -0800
committerDavid S. Miller <davem@davemloft.net>2008-12-04 09:17:03 -0800
commit5565736e44fff06dc5f5c6559e04ac58d2d560ab (patch)
tree08fd6982f1659a4a77439aa19498297e226b1b1b /arch/sparc64/kernel
parentb4f4372f96e0573d752d9e45beda02fabf716cc8 (diff)
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/sparc64/kernel')
-rw-r--r--arch/sparc64/kernel/rtrap.S14
1 files changed, 13 insertions, 1 deletions
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