On Thu, Jan 12, 2017 at 04:37:16PM +0100, 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 < 64kB 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.

For the btrfs bits,

Acked-by: David Sterba <dsterba@suse.com>

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