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bcache: Avoid nested function definition
Fixes below error with clang:
../drivers/md/bcache/sysfs.c:759:3: error: function definition is not allowed here
{ return *((uint16_t *) r) - *((uint16_t *) l); }
^
../drivers/md/bcache/sysfs.c:789:32: error: use of undeclared identifier 'cmp'
sort(p, n, sizeof(uint16_t), cmp, NULL);
^
2 errors generated.
v2:
rename function to __bch_cache_cmp
Signed-off-by: Peter Foley <pefoley2@pefoley.com>
Reviewed-by: Coly Li <colyli@suse.de>
Reviewed-by: Michael Lyle <mlyle@lyle.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>