Re: [PATCH v2] mm, slab: clean up slab->obj_exts always

[Vlastimil Babka]

On 4/24/25 18:34, Andy Shevchenko wrote:
> On Mon, Apr 21, 2025 at 03:52:32PM +0800, Zhenhua Huang wrote:
>> When memory allocation profiling is disabled at runtime or due to an
>> error, shutdown_mem_profiling() is called: slab->obj_exts which
>> previously allocated remains.
>> It won't be cleared by unaccount_slab() because of
>> mem_alloc_profiling_enabled() not true. It's incorrect, slab->obj_exts
>> should always be cleaned up in unaccount_slab() to avoid following error:
>> 
>> [...]BUG: Bad page state in process...
>> ..
>> [...]page dumped because: page still charged to cgroup
> 
> Please, always compile test with `make W=1`. Since CONFIG_WERROR=y this
> effectively breaks the build with Clang.

I don't see why, nor observe any W=1 warnings, can you be more specific? Thanks.