From: David S. Miller Date: Thu, 16 Feb 2006 05:16:42 +0000 (-0800) Subject: [SPARC64]: Do not write garbage into %pstate in tsb_context_switch(). X-Git-Tag: v2.6.17-rc1~1184^2~100 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a7b31bac691668a60da8b9892124b7da408e0a0e;p=linux-2.6 [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: David S. Miller --- diff --git a/arch/sparc64/kernel/tsb.S b/arch/sparc64/kernel/tsb.S index be8f0892d7..7996c9d667 100644 --- a/arch/sparc64/kernel/tsb.S +++ b/arch/sparc64/kernel/tsb.S @@ -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