block: unalign call_single_data in struct request

A previous change blindly added massive alignment to the
call_single_data structure in struct request. This ballooned it in size
from 296 to 320 bytes on my setup, for no valid reason at all.

Use the unaligned struct __call_single_data variant instead.

Fixes: 966a967116e69 ("smp: Avoid using two cache lines for struct call_single_data")
Cc: [email protected] # v4.14
Signed-off-by: Jens Axboe <[email protected]>

diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 100d0df38026aa47f33c95b1fe2d1f969e7aa498..0ce8a372d5069a7aca7810429a968d20e923d3d1 100644 (file)
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -135,7 +135,7 @@ typedef __u32 __bitwise req_flags_t;
 struct request {
        struct list_head queuelist;
        union {
-               call_single_data_t csd;
+               struct __call_single_data csd;
                u64 fifo_time;
        };