Commit a7b31bac authored by David S. Miller's avatar David S. Miller
Browse files

[SPARC64]: Do not write garbage into %pstate in tsb_context_switch(). 



For SUN4V, we were clobbering %o5 to do the hypervisor call.
This clobbers the saved %pstate value and we end up writing
garbage into that register as a result.  Oops.

Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent de635d83

arch/sparc64/kernel/tsb.S

+7 −1
Original line number Diff line number Diff line
@@ -265,13 +265,19 @@ __tsb_context_switch: 
	mov	SCRATCHPAD_UTSBREG2, %g1

	stxa	%g2, [%g1] ASI_SCRATCHPAD



	/* Save away %o5's %pstate, we have to use %o5 for

	 * the hypervisor call.

	 */

	mov	%o5, %g1



	mov	HV_FAST_MMU_TSB_CTXNON0, %o5

	mov	1, %o0

	mov	%o4, %o1

	ta	HV_FAST_TRAP



	/* Finish up and restore %o5.  */

	ba,pt	%xcc, 9f

	 nop

	 mov	%g1, %o5



	/* SUN4U TSB switch.  */

1:	mov	TSB_REG, %g1

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