Re: [PATCH] xtensa: Increase size of gcc stack frame check

[Max Filippov]

On Mon, Sep 13, 2021 at 9:11 AM Guenter Roeck <linux@xxxxxxxxxxxx> wrote:
> The functions I checked typically have pretty large local data
> (like, more than 700-800 bytes). The errors are only observed
> with xtensa:allmodconfig test builds. While it may be arguable
> if those functions really need that much data on the stack, it
> is unreasonable to assume that all those errors (again, more
> than 50) are ever going to get fixed, especially since the errors
> are only seen with xtensa and not with any other architecture

That's not what I observe. If I build allmodconfig on v5.15-rc1
for arm with gcc-8.3 I get 69 of them.

> (including parisc; setting a stack limit of 1024 works just fine
> with that architecture, at least with gcc 11.x). So the realistic

This comparison is a bit biased because allmodconfig on xtensa
enables KASAN which is not supported by the parisc. Disabling
KASAN roughly halves the size of stack frames for a few
instances that I've checked.

-- 
Thanks.
-- Max