Re: [PATCH] s390/pai: Reduce excessive debug feature size

[Vasily Gorbik <gor@linux.ibm.com>]

On Tue, Aug 25, 2026 at 11:49:25AM +0200, Heiko Carstens wrote:
> The pai debug feature is registered with 256 areas, where each area
> contains 32 pages. This sums up to a total of 32MiB. The code does not use
> any debug exceptions, which means that 255 of those areas are never
> used. In addition all existing debug feature calls have a lower level (5)
> than the default level (3).
> 
> This in turn means that without user interaction the debug feature is
> unused.
> 
> Reduce the number of areas to 1, and also reduce the number of pages for
> the remaining area to 1. Since user interaction is required, the user can
> also increase the size of the remaining area, instead of wasting memory by
> default.
> 
> This reduces the total size of the debug feature to 4KiB.
> 
> Fixes: a3f8423622ef ("s390/pai_crypto: Add PAI crypto characteristics table for parameters")
> Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
> ---
>  arch/s390/kernel/perf_pai.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

Applied, thank you!