linux-kernel - [PATCH 1/4] pipe: reduce padding in struct pipe_inode

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Date:   Thu, 21 Sep 2023 09:57:52 +0200
From:   Max Kellermann <max.kellermann@...os.com>
To:     viro@...iv.linux.org.uk, brauner@...nel.org, howells@...hat.com
Cc:     linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        Max Kellermann <max.kellermann@...os.com>
Subject: [PATCH 1/4] pipe: reduce padding in struct pipe_inode_info

This has no effect on 64 bit because there are 10 32-bit integers
surrounding the two bools, but on 32 bit architectures, this reduces
the struct size by 4 bytes by merging the two bools into one word.

Signed-off-by: Max Kellermann <max.kellermann@...os.com>
---
 include/linux/pipe_fs_i.h | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/include/linux/pipe_fs_i.h b/include/linux/pipe_fs_i.h
index 608a9eb86bff..598a411d7da2 100644
--- a/include/linux/pipe_fs_i.h
+++ b/include/linux/pipe_fs_i.h
@@ -62,9 +62,6 @@ struct pipe_inode_info {
 	unsigned int tail;
 	unsigned int max_usage;
 	unsigned int ring_size;
-#ifdef CONFIG_WATCH_QUEUE
-	bool note_loss;
-#endif
 	unsigned int nr_accounted;
 	unsigned int readers;
 	unsigned int writers;
@@ -72,6 +69,9 @@ struct pipe_inode_info {
 	unsigned int r_counter;
 	unsigned int w_counter;
 	bool poll_usage;
+#ifdef CONFIG_WATCH_QUEUE
+	bool note_loss;
+#endif
 	struct page *tmp_page;
 	struct fasync_struct *fasync_readers;
 	struct fasync_struct *fasync_writers;
-- 
2.39.2