linux-kernel - Re: [PATCH v2 2/2] alloc_tag: outline and export free_reserved

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Message-ID: <CAJuCfpG0W=65v9Z5zPg4R3cmeQSexhA5nJTJSAsEc4ogqbC8eA@mail.gmail.com>
Date: Wed, 17 Jul 2024 14:30:29 -0700
From: Suren Baghdasaryan <surenb@...gle.com>
To: Vlastimil Babka <vbabka@...e.cz>
Cc: akpm@...ux-foundation.org, kent.overstreet@...ux.dev, hch@...radead.org, 
	pasha.tatashin@...een.com, souravpanda@...gle.com, keescook@...omium.org, 
	linux-kernel@...r.kernel.org, linux-mm@...ck.org, 
	kernel test robot <lkp@...el.com>
Subject: Re: [PATCH v2 2/2] alloc_tag: outline and export free_reserved_page()

On Wed, Jul 17, 2024 at 2:20 PM Suren Baghdasaryan <surenb@...gle.com> wrote:
>
> On Wed, Jul 17, 2024 at 1:19 PM Vlastimil Babka <vbabka@...e.cz> wrote:
> >
> > On 7/17/24 10:04 PM, Suren Baghdasaryan wrote:
> > > On Wed, Jul 17, 2024 at 12:36 PM Vlastimil Babka <vbabka@...e.cz> wrote:
> > >>
> > >> On 7/17/24 8:12 PM, Suren Baghdasaryan wrote:
> > >> > Outline and export free_reserved_page() because modules use it and it
> > >> > in turn uses page_ext_{get|put} which should not be exported. The same
> > >> > result could be obtained by outlining {get|put}_page_tag_ref() but that
> > >> > would have higher performance impact as these functions are used in
> > >> > more performance critical paths.
> > >> >
> > >> > Fixes: dcfe378c81f7 ("lib: introduce support for page allocation tagging")
> > >> > Reported-by: kernel test robot <lkp@...el.com>
> > >> > Closes: https://lore.kernel.org/oe-kbuild-all/202407080044.DWMC9N9I-lkp@intel.com/
> > >> > Suggested-by: Christoph Hellwig <hch@...radead.org>
> > >> > Suggested-by: Vlastimil Babka <vbabka@...e.cz>
> > >> > Signed-off-by: Suren Baghdasaryan <surenb@...gle.com>
> > >>
> > >> Acked-by: Vlastimil Babka <vbabka@...e.cz>
> > >>
> > >> Are these two patches now stable@ material as 6.10 build is broken on ppc64
> > >> with alloc taging enabled?
> > >
> > > I tested them with that specific configuration mentioned in the bug
> > > report and with several usual ones I use.
> > > Yeah, I guess from now on all such fixes should have
> > >
> > > Cc: stable@...r.kernel.org # v6.10
> >
> > Right. BTW I have just realized that the way you did Patch 2/2 and outlined
> > the whole free_reserved_page() (which is fair, it's an init-time function),
> > mem_alloc_profiling_enabled() didn't stay inlined so Patch 1/2 is in fact
> > not necessary anymore?
>
> Yeah, I think you are right, currently no module has reasons to use
> mem_alloc_profiling_enabled() directly. That might change in the
> future but we can add the export at the time it's needed.
> I checked and ppc64 build passes with just this patch. Let me post v3
> with just this patch and Cc stable@.

v3 posted at https://lore.kernel.org/all/20240717212844.2749975-1-surenb@google.com/

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> >