Workaround for Errata 4504: PMC0 doesn't seem to set SIARLOG when
an exception occurs. Instead, log the PC for when we took the actual
exception.
Index: 2.6.21/arch/powerpc/oprofile/op_model_pa6t.c
===================================================================
--- 2.6.21.orig/arch/powerpc/oprofile/op_model_pa6t.c
+++ 2.6.21/arch/powerpc/oprofile/op_model_pa6t.c
@@ -215,6 +215,9 @@ static void pa6t_handle_interrupt(struct
if (oprofile_running && ctr[i].enabled) {
if (mmcr0 & PA6T_MMCR0_SIARLOG)
oprofile_add_ext_sample(pc, regs, i,
is_kernel);
+ else if (i < 2)
+ /* PMC0/1 might not set SIARLOG, just
log PC at time of fault */
+ oprofile_add_ext_sample(regs->nip,
regs, i, is_kernel);
ctr_write(i, reset_value[i]);
} else {
ctr_write(i, 0UL);
--
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