diff options
author | Paul Mackerras <paulus@samba.org> | 2009-06-03 09:38:58 (GMT) |
---|---|---|
committer | Ingo Molnar <mingo@elte.hu> | 2009-06-03 09:49:52 (GMT) |
commit | 6984efb692e97ce5f75f26e595685c04c2061bac (patch) | |
tree | d7093e4fe93fbec7a244ed9b85aadcacf9c25de8 /arch/powerpc/kernel/power5-pmu.c | |
parent | ed966aac335a63083d3125198479447248637d9e (diff) | |
download | linux-fsl-qoriq-6984efb692e97ce5f75f26e595685c04c2061bac.tar.xz |
perf_counter: powerpc: Fix event alternative code generation on POWER5/5+
Commit ef923214 ("perf_counter: powerpc: use u64 for event
codes internally") introduced a bug where the return value from
function find_alternative_bdecode gets put into a u64 variable
and later tested to see if it is < 0. The effect is that we
get extra, bogus event code alternatives on POWER5 and POWER5+,
leading to error messages such as "oops compute_mmcr failed"
being printed and counters not counting properly.
This fixes it by using s64 for the return type of
find_alternative_bdecode and for the local variable that the
caller puts the value in. It also makes the event argument a
u64 on POWER5+ for consistency.
Signed-off-by: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: John Kacur <jkacur@redhat.com>
Cc: Stephane Eranian <eranian@googlemail.com>
LKML-Reference: <18982.17586.666132.90983@cargo.ozlabs.ibm.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/powerpc/kernel/power5-pmu.c')
-rw-r--r-- | arch/powerpc/kernel/power5-pmu.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/powerpc/kernel/power5-pmu.c b/arch/powerpc/kernel/power5-pmu.c index d534496..1b44c5f 100644 --- a/arch/powerpc/kernel/power5-pmu.c +++ b/arch/powerpc/kernel/power5-pmu.c @@ -250,7 +250,7 @@ static const unsigned char bytedecode_alternatives[4][4] = { * PMCSEL values on other counters. This returns the alternative * event code for those that do, or -1 otherwise. */ -static u64 find_alternative_bdecode(u64 event) +static s64 find_alternative_bdecode(u64 event) { int pmc, altpmc, pp, j; @@ -272,7 +272,7 @@ static u64 find_alternative_bdecode(u64 event) static int power5_get_alternatives(u64 event, unsigned int flags, u64 alt[]) { int i, j, nalt = 1; - u64 ae; + s64 ae; alt[0] = event; nalt = 1; |