linux-kernel - [tip: ras/urgent] x86/mce: Make sure logged MCEs are processed after sysfs update

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Date:   Sun, 12 Mar 2023 20:38:33 -0000
From:   "tip-bot2 for Yazen Ghannam" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Yazen Ghannam <yazen.ghannam@....com>,
        "Borislav Petkov (AMD)" <bp@...en8.de>,
        Tony Luck <tony.luck@...el.com>, stable@...r.kernel.org,
        x86@...nel.org, linux-kernel@...r.kernel.org
Subject: [tip: ras/urgent] x86/mce: Make sure logged MCEs are processed after
 sysfs update

The following commit has been merged into the ras/urgent branch of tip:

Commit-ID:     4783b9cb374af02d49740e00e2da19fd4ed6dec4
Gitweb:        https://git.kernel.org/tip/4783b9cb374af02d49740e00e2da19fd4ed6dec4
Author:        Yazen Ghannam <yazen.ghannam@....com>
AuthorDate:    Wed, 01 Mar 2023 22:14:20 
Committer:     Borislav Petkov (AMD) <bp@...en8.de>
CommitterDate: Sun, 12 Mar 2023 21:12:21 +01:00

x86/mce: Make sure logged MCEs are processed after sysfs update

A recent change introduced a flag to queue up errors found during
boot-time polling. These errors will be processed during late init once
the MCE subsystem is fully set up.

A number of sysfs updates call mce_restart() which goes through a subset
of the CPU init flow. This includes polling MCA banks and logging any
errors found. Since the same function is used as boot-time polling,
errors will be queued. However, the system is now past late init, so the
errors will remain queued until another error is found and the workqueue
is triggered.

Call mce_schedule_work() at the end of mce_restart() so that queued
errors are processed.

Fixes: 3bff147b187d ("x86/mce: Defer processing of early errors")
Signed-off-by: Yazen Ghannam <yazen.ghannam@....com>
Signed-off-by: Borislav Petkov (AMD) <bp@...en8.de>
Reviewed-by: Tony Luck <tony.luck@...el.com>
Cc: stable@...r.kernel.org
Link: https://lore.kernel.org/r/20230301221420.2203184-1-yazen.ghannam@amd.com
---
 arch/x86/kernel/cpu/mce/core.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/kernel/cpu/mce/core.c b/arch/x86/kernel/cpu/mce/core.c
index 7832a69..2eec60f 100644
--- a/arch/x86/kernel/cpu/mce/core.c
+++ b/arch/x86/kernel/cpu/mce/core.c
@@ -2355,6 +2355,7 @@ static void mce_restart(void)
 {
 	mce_timer_delete_all();
 	on_each_cpu(mce_cpu_restart, NULL, 1);
+	mce_schedule_work();
 }

 /* Toggle features for corrected errors */