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Re: [PATCH 5/9] treewide: use kv[mz]alloc* rather than opencoded variants

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On 01/30/2017 10:49 AM, Michal Hocko wrote:
> From: Michal Hocko <mhocko@suse.com>
>
> There are many code paths opencoding kvmalloc. Let's use the helper
> instead. The main difference to kvmalloc is that those users are usually
> not considering all the aspects of the memory allocator. E.g. allocation
> requests <= 32kB (with 4kB pages) are basically never failing and invoke
> OOM killer to satisfy the allocation. This sounds too disruptive for
> something that has a reasonable fallback - the vmalloc. On the other
> hand those requests might fallback to vmalloc even when the memory
> allocator would succeed after several more reclaim/compaction attempts
> previously. There is no guarantee something like that happens though.
>
> This patch converts many of those places to kv[mz]alloc* helpers because
> they are more conservative.
>
> Changes since v1
> - add kvmalloc_array - this might silently fix some overflow issues
>   because most users simply didn't check the overflow for the vmalloc
>   fallback.
>
> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
> Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
> Cc: Herbert Xu <herbert@gondor.apana.org.au>
> Cc: Anton Vorontsov <anton@enomsg.org>
> Cc: Colin Cross <ccross@android.com>
> Cc: Kees Cook <keescook@chromium.org>
> Cc: Tony Luck <tony.luck@intel.com>
> Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
> Cc: Ben Skeggs <bskeggs@redhat.com>
> Cc: Kent Overstreet <kent.overstreet@gmail.com>
> Cc: Santosh Raspatur <santosh@chelsio.com>
> Cc: Hariprasad S <hariprasad@chelsio.com>
> Cc: Yishai Hadas <yishaih@mellanox.com>
> Cc: Oleg Drokin <oleg.drokin@intel.com>
> Cc: "Yan, Zheng" <zyan@redhat.com>
> Cc: Alexander Viro <viro@zeniv.linux.org.uk>
> Cc: Alexei Starovoitov <ast@kernel.org>
> Cc: Eric Dumazet <eric.dumazet@gmail.com>
> Cc: netdev@vger.kernel.org
> Acked-by: Andreas Dilger <andreas.dilger@intel.com> # Lustre
> Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com> # Xen bits
> Acked-by: Christian Borntraeger <borntraeger@de.ibm.com> # KVM/s390
> Acked-by: Dan Williams <dan.j.williams@intel.com> # nvdim
> Acked-by: David Sterba <dsterba@suse.com> # btrfs
> Acked-by: Ilya Dryomov <idryomov@gmail.com> # Ceph
> Acked-by: Tariq Toukan <tariqt@mellanox.com> # mlx4
> Signed-off-by: Michal Hocko <mhocko@suse.com>

Acked-by: Vlastimil Babka <vbabka@suse.cz>

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[PATCH 0/6 v3] kvmalloc Michal Hocko <mhocko@kernel.org> - 2017-01-30 11:00 +0100
  [PATCH 8/9] bcache: use kvmalloc Michal Hocko <mhocko@kernel.org> - 2017-01-30 11:00 +0100
    Re: [PATCH 8/9] bcache: use kvmalloc Vlastimil Babka <vbabka@suse.cz> - 2017-01-30 18:00 +0100
      Re: [PATCH 8/9] bcache: use kvmalloc Michal Hocko <mhocko@kernel.org> - 2017-01-30 18:30 +0100
  [PATCH 9/9] net, bpf: use kvzalloc helper Michal Hocko <mhocko@kernel.org> - 2017-01-30 11:00 +0100
    Re: [PATCH 9/9] net, bpf: use kvzalloc helper Michal Hocko <mhocko@kernel.org> - 2017-01-30 18:30 +0100
  [PATCH 4/9] ila: simplify a strange allocation pattern Michal Hocko <mhocko@kernel.org> - 2017-01-30 11:00 +0100
    Re: [PATCH 4/9] ila: simplify a strange allocation pattern Vlastimil Babka <vbabka@suse.cz> - 2017-01-30 16:30 +0100
  [PATCH 2/9] mm: support __GFP_REPEAT in kvmalloc_node for >32kB Michal Hocko <mhocko@kernel.org> - 2017-01-30 11:00 +0100
  [PATCH 7/9] md: use kvmalloc rather than opencoded variant Michal Hocko <mhocko@kernel.org> - 2017-01-30 11:00 +0100
    Re: [PATCH 7/9] md: use kvmalloc rather than opencoded variant Vlastimil Babka <vbabka@suse.cz> - 2017-01-30 18:00 +0100
    Re: [PATCH 7/9] md: use kvmalloc rather than opencoded variant Mikulas Patocka <mpatocka@redhat.com> - 2017-02-01 18:40 +0100
      Re: [PATCH 7/9] md: use kvmalloc rather than opencoded variant Michal Hocko <mhocko@kernel.org> - 2017-02-01 19:00 +0100
  Re: [PATCH 5/9] treewide: use kv[mz]alloc* rather than opencoded  variants Leon Romanovsky <leon@kernel.org> - 2017-01-30 11:40 +0100
  Re: [PATCH 5/9] treewide: use kv[mz]alloc* rather than opencoded  variants Vlastimil Babka <vbabka@suse.cz> - 2017-01-30 17:40 +0100
  Re: [PATCH 5/9] treewide: use kv[mz]alloc* rather than opencoded variants Kees Cook <keescook@chromium.org> - 2017-01-30 20:30 +0100
  Re: [PATCH 0/6 v3] kvmalloc Michal Hocko <mhocko@kernel.org> - 2017-02-05 11:30 +0100

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