linux-kernel - Re: [PATCH] ACPI: extlog: Clear Extended Error Log status when RAS

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Message-ID: <CAJZ5v0j4djPUdJ3pdzH+E0npJHxMCHFYj4sG2-=S50=XyX_0qg@mail.gmail.com>
Date:   Wed, 13 Dec 2023 13:51:43 +0100
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Tony Luck <tony.luck@...el.com>
Cc:     "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Erwin Tsaur <erwin.tsaur@...el.com>,
        Borislav Petkov <bp@...en8.de>, linux-acpi@...r.kernel.org,
        linux-kernel@...r.kernel.org, patches@...ts.linux.dev
Subject: Re: [PATCH] ACPI: extlog: Clear Extended Error Log status when
 RAS_CEC handled the error

On Tue, Dec 12, 2023 at 10:22 PM Tony Luck <tony.luck@...el.com> wrote:
>
> When both CONFIG_RAS_CEC and CONFIG_ACPI_EXTLOG are enabled, Linux does
> not clear the status word of the BIOS supplied error record for corrected
> errors. This may prevent logging of subsequent uncorrected errors.
>
> Fix by clearing the status.
>
> Fixes: 23ba710a0864 ("x86/mce: Fix all mce notifiers to update the mce->kflags bitmask")
> Reported-by: Erwin Tsaur <erwin.tsaur@...el.com>
> Signed-off-by: Tony Luck <tony.luck@...el.com>
> ---
>  drivers/acpi/acpi_extlog.c | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/acpi/acpi_extlog.c b/drivers/acpi/acpi_extlog.c
> index e120a96e1eae..71e8d4e7a36c 100644
> --- a/drivers/acpi/acpi_extlog.c
> +++ b/drivers/acpi/acpi_extlog.c
> @@ -145,9 +145,14 @@ static int extlog_print(struct notifier_block *nb, unsigned long val,
>         static u32 err_seq;
>
>         estatus = extlog_elog_entry_check(cpu, bank);
> -       if (estatus == NULL || (mce->kflags & MCE_HANDLED_CEC))
> +       if (!estatus)
>                 return NOTIFY_DONE;
>
> +       if (mce->kflags & MCE_HANDLED_CEC) {
> +               estatus->block_status = 0;
> +               return NOTIFY_DONE;
> +       }
> +
>         memcpy(elog_buf, (void *)estatus, ELOG_ENTRY_LEN);
>         /* clear record status to enable BIOS to update it again */
>         estatus->block_status = 0;
> --

Applied as 6.8 material, thanks!