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

On 9/8/21 10:58 PM, Christoph Hellwig wrote:

On Wed, Sep 08, 2021 at 11:58:56PM +0200, Marco Elver wrote:

quoted

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 \
       |  ^~~~~~~

I have been wondering if all those #warning "errors" should either
be removed or be replaced with "#pragma message".

Guenter