From: Michal Hocko <mhocko@kernel.org>
To: Vlastimil Babka <vbabka@suse.cz>
Cc: LKML <linux-kernel@vger.kernel.org>,
"Andrew Morton" <akpm@linux-foundation.org>,
linux-mm@kvack.org, "Alex Deucher" <alexander.deucher@amd.com>,
"Alex Thorlton" <athorlton@sgi.com>,
"Andrea Arcangeli" <aarcange@redhat.com>,
"Andy Lutomirski" <luto@amacapital.net>,
"Benjamin LaHaise" <bcrl@kvack.org>,
"Christian König" <christian.koenig@amd.com>,
"Daniel Vetter" <daniel.vetter@intel.com>,
"Dave Hansen" <dave.hansen@linux.intel.com>,
"David Airlie" <airlied@linux.ie>,
"Davidlohr Bueso" <dave@stgolabs.net>,
"David Rientjes" <rientjes@google.com>,
"H . Peter Anvin" <hpa@zytor.com>,
"Hugh Dickins" <hughd@google.com>,
"Ingo Molnar" <mingo@kernel.org>,
"Johannes Weiner" <hannes@cmpxchg.org>,
"Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>,
"Konstantin Khlebnikov" <koct9i@gmail.com>,
linux-arch@vger.kernel.org, "Mel Gorman" <mgorman@suse.de>,
"Oleg Nesterov" <oleg@redhat.com>,
"Peter Zijlstra" <peterz@infradead.org>,
"Petr Cermak" <petrcermak@chromium.org>,
"Thomas Gleixner" <tglx@linutronix.de>,
"Al Viro" <viro@zeniv.linux.org.uk>
Subject: Re: [PATCH 02/18] mm: make vm_mmap killable
Date: Fri, 11 Mar 2016 13:12:35 +0100 [thread overview]
Message-ID: <20160311121235.GI27701@dhcp22.suse.cz> (raw)
In-Reply-To: <56E29702.5030100@suse.cz>
On Fri 11-03-16 10:59:30, Vlastimil Babka wrote:
> On 02/29/2016 02:26 PM, Michal Hocko wrote:
> >From: Michal Hocko <mhocko@suse.com>
> >
> >All the callers of vm_mmap seem to check for the failure already
> >and bail out in one way or another on the error which means that
>
> Hmm I'm not that sure about this one:
> 17 1071 fs/binfmt_elf.c <<load_elf_binary>>
>
> Assigns result of vm_mmap() to "error" variable which is never checked.
Yes it is not checked but not used either. If the current got killed
then it wouldn't return to the userspace so my understanding is that not
checking this value is not a problem. At least that is my understanding.
> Shouldn't __must_check trigger here?
well, __must_check is a misleading name. It doesn't actually enforce the
value is checked. It just has to be used and an assignment is
sufficient. I was discussing this without our gcc guy and he promissed
to look and try to come up with a different attribute which would
actually work like __must_check.
--
Michal Hocko
SUSE Labs
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next prev parent reply other threads:[~2016-03-11 12:12 UTC|newest]
Thread overview: 88+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-29 13:26 [PATCH 0/18] change mmap_sem taken for write killable Michal Hocko
2016-02-29 13:26 ` [PATCH 01/18] mm: Make mmap_sem for write waits killable for mm syscalls Michal Hocko
2016-02-29 13:44 ` kbuild test robot
2016-02-29 13:44 ` kbuild test robot
2016-03-10 15:47 ` Vlastimil Babka
2016-03-10 15:56 ` Michal Hocko
2016-02-29 13:26 ` [PATCH 02/18] mm: make vm_mmap killable Michal Hocko
2016-03-11 9:59 ` Vlastimil Babka
2016-03-11 12:12 ` Michal Hocko [this message]
2016-03-11 12:43 ` Vlastimil Babka
2016-03-11 12:55 ` Michal Hocko
2016-02-29 13:26 ` [PATCH 03/18] mm: make vm_munmap killable Michal Hocko
2016-03-11 10:06 ` Vlastimil Babka
2016-03-11 12:32 ` Michal Hocko
2016-02-29 13:26 ` [PATCH 04/18] mm, aout: handle vm_brk failures Michal Hocko
2016-03-11 10:32 ` Vlastimil Babka
2016-03-11 12:42 ` Michal Hocko
2016-02-29 13:26 ` [PATCH 05/18] mm, elf: handle vm_brk error Michal Hocko
2016-03-11 10:35 ` Vlastimil Babka
2016-02-29 13:26 ` [PATCH 06/18] mm: make vm_brk killable Michal Hocko
2016-03-11 10:44 ` Vlastimil Babka
2016-02-29 13:26 ` [PATCH 07/18] mm, proc: make clear_refs killable Michal Hocko
2016-02-29 13:47 ` kbuild test robot
2016-02-29 17:38 ` Oleg Nesterov
2016-02-29 17:53 ` Michal Hocko
2016-02-29 17:58 ` Oleg Nesterov
2016-02-29 18:02 ` Michal Hocko
2016-02-29 17:56 ` [PATCH] " Michal Hocko
2016-02-29 18:16 ` Oleg Nesterov
2016-02-29 20:25 ` kbuild test robot
2016-03-11 10:59 ` Vlastimil Babka
2016-02-29 13:26 ` [PATCH 08/18] mm, fork: make dup_mmap wait for mmap_sem for write killable Michal Hocko
2016-02-29 13:48 ` kbuild test robot
2016-02-29 17:54 ` Oleg Nesterov
2016-02-29 18:07 ` [PATCH] " Michal Hocko
2016-02-29 20:13 ` kbuild test robot
2016-03-11 11:12 ` Vlastimil Babka
2016-02-29 13:26 ` [PATCH 09/18] ipc, shm: make shmem attach/detach wait for mmap_sem killable Michal Hocko
2016-03-08 19:15 ` Davidlohr Bueso
2016-03-09 10:16 ` Michal Hocko
2016-03-09 10:19 ` [PATCH] " Michal Hocko
2016-03-09 10:46 ` kbuild test robot
2016-03-11 11:18 ` Vlastimil Babka
2016-02-29 13:26 ` [PATCH 10/18] vdso: make arch_setup_additional_pages wait for mmap_sem for write killable Michal Hocko
2016-02-29 13:45 ` kbuild test robot
2016-02-29 13:50 ` kbuild test robot
2016-02-29 13:53 ` kbuild test robot
2016-02-29 15:41 ` Andy Lutomirski
2016-03-11 11:28 ` Vlastimil Babka
2016-02-29 13:26 ` [PATCH 11/18] coredump: make coredump_wait wait for mma_sem " Michal Hocko
2016-02-29 15:57 ` Oleg Nesterov
2016-03-11 11:32 ` Vlastimil Babka
2016-03-11 11:54 ` Vlastimil Babka
2016-03-11 12:46 ` Michal Hocko
2016-02-29 13:26 ` [PATCH 12/18] aio: make aio_setup_ring killable Michal Hocko
2016-02-29 16:17 ` Jeff Moyer
2016-03-11 11:57 ` Vlastimil Babka
2016-02-29 13:26 ` [PATCH 13/18] exec: make exec path waiting for mmap_sem killable Michal Hocko
2016-02-29 17:23 ` Oleg Nesterov
2016-02-29 17:47 ` Michal Hocko
2016-02-29 18:10 ` Oleg Nesterov
2016-03-11 12:51 ` Vlastimil Babka
2016-02-29 13:26 ` [PATCH 14/18] prctl: make PR_SET_THP_DISABLE wait " Michal Hocko
2016-03-11 12:54 ` Vlastimil Babka
2016-02-29 13:26 ` [PATCH 15/18] uprobes: wait for mmap_sem for write killable Michal Hocko
2016-02-29 15:57 ` Oleg Nesterov
2016-02-29 16:28 ` Michal Hocko
2016-02-29 17:12 ` Oleg Nesterov
2016-02-29 17:42 ` [PATCH] " Michal Hocko
2016-02-29 17:52 ` kbuild test robot
2016-02-29 17:53 ` kbuild test robot
2016-02-29 18:11 ` Oleg Nesterov
2016-02-29 18:22 ` Michal Hocko
2016-02-29 18:38 ` Oleg Nesterov
2016-03-11 14:58 ` Vlastimil Babka
2016-03-11 15:32 ` Michal Hocko
2016-02-29 13:26 ` [PATCH 16/18] drm/i915: make i915_gem_mmap_ioctl wait for mmap_sem killable Michal Hocko
2016-03-11 15:23 ` Vlastimil Babka
2016-02-29 13:26 ` [PATCH 17/18] drm/radeon: make radeon_mn_get " Michal Hocko
2016-02-29 13:35 ` Christian König
2016-03-11 15:27 ` Vlastimil Babka
2016-02-29 13:26 ` [PATCH 18/18] drm/amdgpu: make amdgpu_mn_get " Michal Hocko
2016-03-11 15:29 ` Vlastimil Babka
2016-02-29 13:31 ` [PATCH 0/18] change mmap_sem taken for write killable Michal Hocko
2016-02-29 14:04 ` Kirill A. Shutemov
2016-02-29 14:16 ` Michal Hocko
2016-02-29 15:03 ` Kirill A. Shutemov
2016-04-26 12:56 [PATCH 0/18] change mmap_sem taken for write killable v2 Michal Hocko
2016-04-26 12:56 ` [PATCH 02/18] mm: make vm_mmap killable Michal Hocko
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