Re: [PATCH] Enable '-Werror' by default for all kernel builds

Christoph Hellwig
2021-09-09T06:00:04Z

[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #1: Type: text/plain; charset=unknown-8bit, Size: 949 bytes --]

On Wed, Sep 08, 2021 at 11:58:56PM +0200, Marco Elver wrote:
> It'd be good to avoid. It has helped uncover build issues with KASAN in
> the past. Or at least make it dependent on the problematic architecture.
> For example if arm is a problem, something like this:

I'm also seeing quite a few stack size warnings with KASAN on x86_64
without COMPILT_TEST using gcc 10.2.1 from Debian. In fact there are a
few warnings without KASAN, but with KASAN there are a lot more.
I'll try to find some time to dig into them.

While we're at it, with -Werror something like this is really futile:

drivers/gpu/drm/amd/amdgpu/amdgpu_object.c: In function ‘amdgpu_bo_support_uswc’:
drivers/gpu/drm/amd/amdgpu/amdgpu_object.c:493:2: warning: #warning
Please enable CONFIG_MTRR and CONFIG_X86_PAT for better performance thanks to write-combining [-Wcpp
493 | #warning Please enable CONFIG_MTRR and CONFIG_X86_PAT for better performance \
| ^~~~~~~