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SubjectRe: [PATCH -v2 2/2] x86, MCE: Drop the default decoding notifier
On Tue, Apr 19, 2011 at 01:44:46PM -0400, Ingo Molnar wrote:
>
> * Borislav Petkov <bp@amd64.org> wrote:
>
> > + if (ret != NOTIFY_STOP)
> > + printk_ratelimited(KERN_EMERG HW_ERR
> > + "Run the above through 'mcelog --ascii'\n");
>
> pr_emerg_ratelimited() would allow you to keep that broken line happy?

Not entirely. I had to do the exit-early-to-save-an-indentation-level
trick also :)

--
From: Borislav Petkov <borislav.petkov@amd.com>
Date: Wed, 13 Apr 2011 14:32:06 +0200
Subject: [PATCH -v2.1 2/2] x86, MCE: Drop the default decoding notifier

The default notifier doesn't make a lot of sense to call in the
correctable errors case. Drop it and emit the mcelog decoding hint only
in the uncorrectable errors case and when no notifier is registered.
Also, limit issuing the "mcelog --ascii" message in the rare case when
we dump unreported CEs before panicking.

While at it, remove unused old x86_mce_decode_callback from the header.

Signed-off-by: Borislav Petkov <borislav.petkov@amd.com>
Signed-off-by: Prarit Bhargava <prarit@redhat.com>
---
arch/x86/include/asm/mce.h | 2 --
arch/x86/kernel/cpu/mcheck/mce.c | 24 +++++++-----------------
2 files changed, 7 insertions(+), 19 deletions(-)

diff --git a/arch/x86/include/asm/mce.h b/arch/x86/include/asm/mce.h
index eb16e94..021979a 100644
--- a/arch/x86/include/asm/mce.h
+++ b/arch/x86/include/asm/mce.h
@@ -142,8 +142,6 @@ static inline void winchip_mcheck_init(struct cpuinfo_x86 *c) {}
static inline void enable_p5_mce(void) {}
#endif

-extern void (*x86_mce_decode_callback)(struct mce *m);
-
void mce_setup(struct mce *m);
void mce_log(struct mce *m);
DECLARE_PER_CPU(struct sys_device, mce_dev);
diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c
index 68e2303..ff1ae9b 100644
--- a/arch/x86/kernel/cpu/mcheck/mce.c
+++ b/arch/x86/kernel/cpu/mcheck/mce.c
@@ -105,20 +105,6 @@ static int cpu_missing;
ATOMIC_NOTIFIER_HEAD(x86_mce_decoder_chain);
EXPORT_SYMBOL_GPL(x86_mce_decoder_chain);

-static int default_decode_mce(struct notifier_block *nb, unsigned long val,
- void *data)
-{
- pr_emerg(HW_ERR "No human readable MCE decoding support on this CPU type.\n");
- pr_emerg(HW_ERR "Run the message through 'mcelog --ascii' to decode.\n");
-
- return NOTIFY_STOP;
-}
-
-static struct notifier_block mce_dec_nb = {
- .notifier_call = default_decode_mce,
- .priority = -1,
-};
-
/* MCA banks polled by the period polling timer for corrected events */
DEFINE_PER_CPU(mce_banks_t, mce_poll_banks) = {
[0 ... BITS_TO_LONGS(MAX_NR_BANKS)-1] = ~0UL
@@ -212,6 +198,8 @@ void mce_log(struct mce *mce)

static void print_mce(struct mce *m)
{
+ int ret = 0;
+
pr_emerg(HW_ERR "CPU %d: Machine Check Exception: %Lx Bank %d: %016Lx\n",
m->extcpu, m->mcgstatus, m->bank, m->status);

@@ -239,7 +227,11 @@ static void print_mce(struct mce *m)
* Print out human-readable details about the MCE error,
* (if the CPU has an implementation for that)
*/
- atomic_notifier_call_chain(&x86_mce_decoder_chain, 0, m);
+ ret = atomic_notifier_call_chain(&x86_mce_decoder_chain, 0, m);
+ if (ret == NOTIFY_STOP)
+ return;
+
+ pr_emerg_ratelimited(HW_ERR "Run the above through 'mcelog --ascii'\n");
}

#define PANIC_TIMEOUT 5 /* 5 seconds */
@@ -1721,8 +1713,6 @@ __setup("mce", mcheck_enable);

int __init mcheck_init(void)
{
- atomic_notifier_chain_register(&x86_mce_decoder_chain, &mce_dec_nb);
-
mcheck_intel_therm_init();

return 0;
--
1.7.4.rc2


--
Regards/Gruss,
Boris.

Advanced Micro Devices GmbH
Einsteinring 24, 85609 Dornach
General Managers: Alberto Bozzo, Andrew Bowd
Registration: Dornach, Gemeinde Aschheim, Landkreis Muenchen
Registergericht Muenchen, HRB Nr. 4363


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