Re: [PATCH v3 2/2] x86/mce/dev-mcelog: Fix updating kflags in AMD systems
From: Smita Koralahalli Channabasappa
Date: Mon Sep 14 2020 - 17:21:17 EST
On 9/14/20 10:34 AM, Borislav Petkov wrote:
On Thu, Sep 03, 2020 at 06:45:31PM -0500, Smita Koralahalli wrote:
The mcelog utility is not commonly used on AMD systems. Therefore, errors
logged only by the dev_mce_log() notifier will be missed. This may occur
if the EDAC modules are not loaded in which case it's preferable to print
the error record by the default notifier.
However, the mce->kflags set by dev_mce_log() notifier makes the default
notifier to skip over the errors assuming they are processed by
dev_mce_log().
Do not update kflags in the dev_mce_log() notifier on AMD systems.
Signed-off-by: Smita Koralahalli <Smita.KoralahalliChannabasappa@xxxxxxx>
---
Link:
https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Flkml.kernel.org%2Fr%2F20200828203332.11129-3-Smita.KoralahalliChannabasappa%40amd.com&data=02%7C01%7CSmita.KoralahalliChannabasappa%40amd.com%7Cc452e9f80fe9459839c708d858c3a763%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637356944652485754&sdata=%2FhYQbBBNld1GtNX8%2FI6PERD0icYfy0e1k5zukQYI%2Fa4%3D&reserved=0
v3:
No change
v2:
No change
---
arch/x86/kernel/cpu/mce/dev-mcelog.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/arch/x86/kernel/cpu/mce/dev-mcelog.c b/arch/x86/kernel/cpu/mce/dev-mcelog.c
index 03e51053592a..100fbeebdc72 100644
--- a/arch/x86/kernel/cpu/mce/dev-mcelog.c
+++ b/arch/x86/kernel/cpu/mce/dev-mcelog.c
@@ -67,7 +67,9 @@ static int dev_mce_log(struct notifier_block *nb, unsigned long val,
unlock:
mutex_unlock(&mce_chrdev_read_mutex);
- mce->kflags |= MCE_HANDLED_MCELOG;
+ if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD)
+ mce->kflags |= MCE_HANDLED_MCELOG;
+
return NOTIFY_OK;
}
--
This one is not related to your 1/2 so it sounds to me like I should
take this one now, independently?
Yes, this can be taken independently. I just tagged it along as I came
across the issue of missing error logs while trying to print error
records in the previous patch.
Thanks,
Smita