From 8045a4c293d36c61656a20d581b11f7f0cd7acd5 Mon Sep 17 00:00:00 2001 From: Robert Richter Date: Tue, 7 Jul 2009 19:30:25 +0200 Subject: x86/oprofile: Fix cast of counter value When casting the counter value to a 64 bit value in 32 bit mode, sign extension may lead to broken counter values. This patch fixes this by casting to (u64) instead of (s64). Signed-off-by: Robert Richter --- arch/x86/oprofile/op_model_amd.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'arch/x86/oprofile/op_model_amd.c') diff --git a/arch/x86/oprofile/op_model_amd.c b/arch/x86/oprofile/op_model_amd.c index e95268eb922..7ca8306aefa 100644 --- a/arch/x86/oprofile/op_model_amd.c +++ b/arch/x86/oprofile/op_model_amd.c @@ -111,7 +111,7 @@ static void op_amd_setup_ctrs(struct op_x86_model_spec const *model, if (counter_config[i].enabled && msrs->counters[i].addr) { reset_value[i] = counter_config[i].count; wrmsrl(msrs->counters[i].addr, - -(s64)counter_config[i].count); + -(u64)counter_config[i].count); rdmsrl(msrs->controls[i].addr, val); val &= model->reserved; val |= op_x86_get_ctrl(model, &counter_config[i]); @@ -237,7 +237,7 @@ static int op_amd_check_ctrs(struct pt_regs * const regs, if (val & OP_CTR_OVERFLOW) continue; oprofile_add_sample(regs, i); - wrmsrl(msrs->counters[i].addr, -(s64)reset_value[i]); + wrmsrl(msrs->counters[i].addr, -(u64)reset_value[i]); } op_amd_handle_ibs(regs, msrs); -- cgit v1.2.3