From: Suren Baghdasaryan <surenb@google.com>
To: Vlastimil Babka <vbabka@suse.cz>
Cc: akpm@linux-foundation.org, kent.overstreet@linux.dev,
pasha.tatashin@soleen.com, souravpanda@google.com,
keescook@chromium.org, linux-mm@kvack.org,
linux-kernel@vger.kernel.org, kernel test robot <lkp@intel.com>
Subject: Re: [PATCH 1/1] mm/slab: fix 'variable obj_exts set but not used' warning
Date: Tue, 2 Jul 2024 15:16:18 +0000 [thread overview]
Message-ID: <CAJuCfpGr237=zQb58Zd6E-NmpBfvq-6_LQ58nsiwgx9S1KE0pQ@mail.gmail.com> (raw)
In-Reply-To: <bb4214ca-fada-4aa9-af40-008182ea4006@suse.cz>
On Tue, Jul 2, 2024 at 9:31 AM Vlastimil Babka <vbabka@suse.cz> wrote:
>
> On 6/30/24 9:20 PM, Suren Baghdasaryan wrote:
> > On Mon, Jun 17, 2024 at 3:04 AM Vlastimil Babka <vbabka@suse.cz> wrote:
> >>
> >> On 6/15/24 12:59 AM, Suren Baghdasaryan wrote:
> >> > slab_post_alloc_hook() uses prepare_slab_obj_exts_hook() to obtain
> >> > slabobj_ext object. Currently the only user of slabobj_ext object in
> >> > this path is memory allocation profiling, therefore when it's not enabled
> >> > this object is not needed. This also generates a warning when compiling
> >> > with CONFIG_MEM_ALLOC_PROFILING=n. Move the code under this configuration
> >> > to fix the warning. If more slabobj_ext users appear in the future, the
> >> > code will have to be changed back to call prepare_slab_obj_exts_hook().
> >> >
> >> > Fixes: 4b8736964640 ("mm/slab: add allocation accounting into slab allocation and free paths")
> >> > Reported-by: kernel test robot <lkp@intel.com>
> >> > Closes: https://lore.kernel.org/oe-kbuild-all/202406150444.F6neSaiy-lkp@intel.com/
> >> > Signed-off-by: Suren Baghdasaryan <surenb@google.com>
> >>
> >> Acked-by: Vlastimil Babka <vbabka@suse.cz>
> >>
> >> But it seems to me we could remove the whole #ifdef if current->alloc_tag
> >> (which doesn't exist with !MEM_ALLOC_PROFILING) had an access helper, or
> >> there was a alloc_tag_add_current() variant?
> >
> > Hmm. I'll check if current->alloc_tag is the only reason for this
> > ifdef. If so then you are correct and we can simplify this code.
>
> The fix is now in mm-hotfixes-stable but we can cleanup for the future as a
> non-hotfix.
Yes, it's on my TODO list now. Thanks!
>
next prev parent reply other threads:[~2024-07-02 15:16 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-06-14 22:59 Suren Baghdasaryan
2024-06-17 10:04 ` Vlastimil Babka
2024-06-30 19:20 ` Suren Baghdasaryan
2024-07-02 9:31 ` Vlastimil Babka
2024-07-02 15:16 ` Suren Baghdasaryan [this message]
2024-07-03 1:58 ` Suren Baghdasaryan
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