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Commit 5565736e authored by David S. Miller's avatar David S. Miller
Browse files

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: default avatarDavid S. Miller <davem@davemloft.net>
parent b4f4372f

arch/sparc/include/asm/ttable.h

+1 −1
Original line number Diff line number Diff line
@@ -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)

arch/sparc64/kernel/rtrap.S

+13 −1
Original line number Diff line number Diff line
@@ -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