Re: [PATCH] ACPI/APEI: Better fix to avoid spamming the console with old error logs

[Darren Hart]

On Wed, Jun 22, 2022 at 10:09:06AM -0700, Tony Luck wrote:
> The fix in commit 3f8dec116210 ("ACPI/APEI: Limit printable size of BERT
> table data") does not work as intended on systems where the BIOS has a
> fixed size block of memory for the BERT table, relying on s/w to quit
> when it finds a record with estatus->block_status == 0. On these systems
> all errors are suppressed because the check:
> 
> 	if (region_len < ACPI_BERT_PRINT_MAX_LEN)
> 
> always fails.
> 
> New scheme skips individual CPER records that are too large, and also
> limits the total number of records that will be printed to 5.

Apologies for the delay.

This seems like a reasonable approach. Working to confirm new behavior on Ampere
Altra systems (specifically how region_len and estatus_len are related).

-- 
Darren Hart
Ampere Computing / OS and Kernel