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From: Alexey Dobriyan <adobriyan@gmail.com>
To: akpm@linux-foundation.org
Cc: linux-fsdevel@vger.kernel.org
Subject: [PATCH] proc: shuffle "struct pde_opener"
Date: Sat, 5 Oct 2019 02:47:53 +0300
Message-ID: <20191004234753.GB30246@avx2> (raw)

List iteration takes more code than anything else which means embedded
list_head should be the first element of the structure.

Space savings:

	add/remove: 0/0 grow/shrink: 0/4 up/down: 0/-18 (-18)
	Function                                     old     new   delta
	close_pdeo                                   228     227      -1
	proc_reg_release                              86      82      -4
	proc_entry_rundown                           143     139      -4
	proc_reg_open                                298     289      -9

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
---

 fs/proc/internal.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/fs/proc/internal.h
+++ b/fs/proc/internal.h
@@ -197,8 +197,8 @@ extern ssize_t proc_simple_write(struct file *, const char __user *, size_t, lof
  * inode.c
  */
 struct pde_opener {
-	struct file *file;
 	struct list_head lh;
+	struct file *file;
 	bool closing;
 	struct completion *c;
 } __randomize_layout;

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