btrfs: add const function attribute

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For some reason the attribute is called __attribute_const__ and not
__const, marks functions that have no observable effects on program
state, IOW not reading pointers, just the arguments and calculating a
value. Allows the compiler to do some optimizations, based on
-Wsuggest-attribute=const . The effects are rather small, though, about
60 bytes decrese of btrfs.ko.

Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

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This commit is contained in:

David Sterba 2019-10-01 19:57:37 +02:00

parent b105e92755

commit 4143cb8b6f

4 changed files with 4 additions and 4 deletions

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2

fs/btrfs/ctree.h

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2

fs/btrfs/super.c

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2

fs/btrfs/volumes.c

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2

fs/btrfs/volumes.h

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