linux-kernel - Re: [PATCH] hugetlb: fix CONFIG_CGROUP

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Message-ID: <CAHS8izOTc_7RKHoJVG_dOKEjT1d4KxNOUwMqqZwyqZm0fe=HcA@mail.gmail.com>
Date:   Sun, 16 Feb 2020 13:03:38 -0800
From:   Mina Almasry <almasrymina@...gle.com>
To:     Randy Dunlap <rdunlap@...radead.org>
Cc:     linux-mm@...ck.org, linux-next@...r.kernel.org,
        open list <linux-kernel@...r.kernel.org>,
        David Rientjes <rientjes@...gle.com>,
        Greg Thelen <gthelen@...gle.com>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Shakeel Butt <shakeelb@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] hugetlb: fix CONFIG_CGROUP_HUGETLB ifdefs

On Sun, Feb 16, 2020 at 12:40 PM Mina Almasry <almasrymina@...gle.com> wrote:
>
> On Fri, Feb 14, 2020 at 5:57 PM Randy Dunlap <rdunlap@...radead.org> wrote:
> >
> > On 2/14/20 5:17 PM, Randy Dunlap wrote:
> > > On 2/14/20 1:00 PM, Mina Almasry wrote:
> > >> On Fri, Feb 14, 2020 at 12:46 PM Mina Almasry <almasrymina@...gle.com> wrote:
> > >>>
> > >>> Fixes an #ifdef bug in the patch referred to below that was
> > >>> causing a build error when CONFIG_DEBUG_VM &&
> > >>> !CONFIG_CCGROUP_HUGETLB.
> > >
> > > Hi Mina,
> > >
> > > I don't know if this was supposed to fix the 2 build reports that I made,
> > > but this does not apply cleanly to mmotm (and it's a reply email so it's
> > > more difficult to apply anyway):
> > >
> > > Applying patch mm-hugetlb-fix-CONFIG_CGROUP_HUGETLB.patch
> > > patching file mm/hugetlb.c
> > > Hunk #1 succeeded at 289 with fuzz 1.
> > > Hunk #2 succeeded at 325 with fuzz 2.
> > > Hunk #3 FAILED at 435.
> > > 1 out of 3 hunks FAILED -- rejects in file mm/hugetlb.c
> > >
> >
> > OK, I applied this patch manually and it does fix most of the reported build problems.
> > The only one remaining is this:
> >
> >   CC      mm/migrate.o
> > In file included from ../mm/migrate.c:39:0:
> > ../include/linux/hugetlb_cgroup.h:146:21: warning: ‘struct file_region’ declared inside parameter list will not be visible outside of this definition or declaration
> >               struct file_region *rg,
> >                      ^~~~~~~~~~~
> > ../include/linux/hugetlb_cgroup.h:145:63: warning: ‘struct resv_map’ declared inside parameter list will not be visible outside of this definition or declaration
> >  static inline void hugetlb_cgroup_uncharge_file_region(struct resv_map *resv,
> >                                                                ^~~~~~~~
> > ../include/linux/hugetlb_cgroup.h:233:59: warning: ‘struct resv_map’ declared inside parameter list will not be visible outside of this definition or declaration
> >  static inline void hugetlb_cgroup_uncharge_counter(struct resv_map *resv,
> >                                                            ^~~~~~~~
> >
>
> Hi Randy,
>
> Yes this was supposed to fix the build errors. I'm having trouble
> reproducing the one you have pending above. This is my development
> environment:
>
> ➜  prodkernel2 git:(mm-build-fix) git remote show github-akpm
> * remote github-akpm
>   Fetch URL: https://github.com/hnaz/linux-mm.git
>   Push  URL: https://github.com/hnaz/linux-mm.git
>
> ➜  prodkernel2 git:(mm-build-fix) git s
> ## mm-build-fix...github-akpm/master [ahead 1]
>
> ➜  prodkernel2 git:(mm-build-fix) make -j80 mm/migrate.o
> (succeeds with no warnings).
>
> ➜  prodkernel2 git:(mm-build-fix) make -j80
> (succeeds with no warnings)
>
> Is my development environment wrong? Shouldn't I be able to reproduce
> this build warning on this tree with my fix?
> https://github.com/hnaz/linux-mm.git
>
> I'm using config-r9887 that you sent earlier.
>
> I'm probably supposed to use a different branch since you also say
> that my patch doesn't apply cleanily, but the mmotm readme says that
> github mirrors Andrew's tree?
>

Just looking at the build error without being able to reproduce, it
looks like this diff would fix it?

➜  prodkernel2 git:(mm-build-fix) ✗ git diff
diff --git a/include/linux/hugetlb_cgroup.h b/include/linux/hugetlb_cgroup.h
index a09d4164ba910..5f66cdcbe9b10 100644
--- a/include/linux/hugetlb_cgroup.h
+++ b/include/linux/hugetlb_cgroup.h
@@ -15,6 +15,7 @@
 #ifndef _LINUX_HUGETLB_CGROUP_H
 #define _LINUX_HUGETLB_CGROUP_H

+#include <linux/hugetlb.h>
 #include <linux/mmdebug.h>

 struct hugetlb_cgroup;

Can you let me know? Or any insight into why I can't reproduce the
warning? Wrong tree perhaps?

I suspect a forward declaration of struct resv_map and struct
file_region in hugetlb_cgroup.h would also fix.

> > >
> > >>> Fixes: b5f16a533ce8a ("hugetlb: support file_region coalescing again")
> > >>> Signed-off-by: Mina Almasry <almasrymina@...gle.com>
> > >>> Cc: David Rientjes <rientjes@...gle.com>
> > >>> Cc: Greg Thelen <gthelen@...gle.com>
> > >>> Cc: Mike Kravetz <mike.kravetz@...cle.com>
> > >>> Cc: Shakeel Butt <shakeelb@...gle.com>
> > >>> Cc: Andrew Morton <akpm@...ux-foundation.org>
> > >>> ---
> > >>>  mm/hugetlb.c | 8 +++++---
> > >>>  1 file changed, 5 insertions(+), 3 deletions(-)
> > >>>
> > >>> diff --git a/mm/hugetlb.c b/mm/hugetlb.c
> > >>> index ee6d262fe6ac0..95d34c58981d2 100644
> > >>> --- a/mm/hugetlb.c
> > >>> +++ b/mm/hugetlb.c
> > >>> @@ -289,7 +289,7 @@ static bool has_same_uncharge_info(struct file_region *rg,
> > >>>  #endif
> > >>>  }
> > >>>
> > >>> -#ifdef CONFIG_DEBUG_VM
> > >>> +#if defined(CONFIG_DEBUG_VM) && defined(CONFIG_CGROUP_HUGETLB)
> > >>>  static void dump_resv_map(struct resv_map *resv)
> > >>>  {
> > >>>         struct list_head *head = &resv->regions;
> > >>> @@ -325,6 +325,10 @@ static void check_coalesce_bug(struct resv_map *resv)
> > >>>                 }
> > >>>         }
> > >>>  }
> > >>> +#else
> > >>> +static void check_coalesce_bug(struct resv_map *resv)
> > >>> +{
> > >>> +}
> > >>>  #endif
> > >>>
> > >>>  static void coalesce_file_region(struct resv_map *resv, struct file_region *rg)
> > >>> @@ -431,9 +435,7 @@ static long add_reservation_in_range(struct resv_map *resv, long f, long t,
> > >>>         }
> > >>>
> > >>>         VM_BUG_ON(add < 0);
> > >>> -#ifdef CONFIG_DEBUG_VM
> > >>>         check_coalesce_bug(resv);
> > >>> -#endif
> > >>>         return add;
> > >>>  }
> > >>>
> > >>> --
> > >>> 2.25.0.265.gbab2e86ba0-goog
> >
> >
> > --
> > ~Randy
> > Reported-by: Randy Dunlap <rdunlap@...radead.org>