From: Jens Axboe <axboe@kernel.dk>
Date: Wed, 20 Dec 2017 20:13:58 +0000 (-0700)
Subject: block: unalign call_single_data in struct request
X-Git-Tag: v4.14.10~27
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=f349652293fb79fbd5768dfc18605200177b74d7;p=users%2Fjedix%2Flinux-maple.git

block: unalign call_single_data in struct request

commit 4ccafe032005e9b96acbef2e389a4de5b1254add upstream.

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")
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 8da66379f7ea..fd47bd96b5d3 100644
--- 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;
 	};