[PATCH] bypass hcall stats until cpu features have run
From: Anton Blanchard <hidden>
Date: 2007-03-20 19:29:54
I noticed that we execute hcalls before cpu feature code has run (eg for setting up the bolted kernel region). Create an unconditional branch that we nop out all the time to fix this. Signed-off-by: Anton Blanchard <redacted> --- Index: linux-2.6/arch/powerpc/platforms/pseries/hvCall.S ===================================================================
--- linux-2.6.orig/arch/powerpc/platforms/pseries/hvCall.S 2007-03-08 09:08:11.000000000 -0600
+++ linux-2.6/arch/powerpc/platforms/pseries/hvCall.S 2007-03-08 09:15:12.000000000 -0600@@ -30,9 +30,14 @@ /* * postcall is performed immediately before function return which - * allows liberal use of volatile registers. + * allows liberal use of volatile registers. We branch around this + * in early init (eg when populating the MMU hashtable) by using an + * unconditional cpu feature. */ #define HCALL_INST_POSTCALL \ +BEGIN_FTR_SECTION; \ + b 1f; \ +END_FTR_SECTION(0, 1); \ ld r4,STK_PARM(r3)(r1); /* validate opcode */ \ cmpldi cr7,r4,MAX_HCALL_OPCODE; \ bgt- cr7,1f; \