linux-kernel - [PATCH v2 1/3] mm: kmemleak: Slightly reduce the size of some structures on 64-bit architectures

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Date:   Thu, 25 May 2017 16:42:15 +0100
From:   Catalin Marinas <catalin.marinas@....com>
To:     linux-mm@...ck.org
Cc:     linux-kernel@...r.kernel.org, Michal Hocko <mhocko@...nel.org>,
        Andy Lutomirski <luto@...capital.net>,
        "Luis R. Rodriguez" <mcgrof@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH v2 1/3] mm: kmemleak: Slightly reduce the size of some structures on 64-bit architectures

This patch changes the kmemleak_object.flags type to unsigned int and
moves the early_log.min_count (int) near early_log.op_type (int) to
slightly reduce the size of these structures on 64-bit architectures.

Cc: Michal Hocko <mhocko@...nel.org>
Cc: Andy Lutomirski <luto@...capital.net>
Cc: "Luis R. Rodriguez" <mcgrof@...nel.org>
Signed-off-by: Catalin Marinas <catalin.marinas@....com>
---
 mm/kmemleak.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/mm/kmemleak.c b/mm/kmemleak.c
index 20036d4f9f13..964b12eba2c1 100644
--- a/mm/kmemleak.c
+++ b/mm/kmemleak.c
@@ -150,7 +150,7 @@ struct kmemleak_scan_area {
  */
 struct kmemleak_object {
 	spinlock_t lock;
-	unsigned long flags;		/* object status flags */
+	unsigned int flags;		/* object status flags */
 	struct list_head object_list;
 	struct list_head gray_list;
 	struct rb_node rb_node;
@@ -262,9 +262,9 @@ enum {
  */
 struct early_log {
 	int op_type;			/* kmemleak operation type */
+	int min_count;			/* minimum reference count */
 	const void *ptr;		/* allocated/freed memory block */
 	size_t size;			/* memory block size */
-	int min_count;			/* minimum reference count */
 	unsigned long trace[MAX_TRACE];	/* stack trace */
 	unsigned int trace_len;		/* stack trace length */
 };
@@ -393,7 +393,7 @@ static void dump_object_info(struct kmemleak_object *object)
 		  object->comm, object->pid, object->jiffies);
 	pr_notice("  min_count = %d\n", object->min_count);
 	pr_notice("  count = %d\n", object->count);
-	pr_notice("  flags = 0x%lx\n", object->flags);
+	pr_notice("  flags = 0x%x\n", object->flags);
 	pr_notice("  checksum = %u\n", object->checksum);
 	pr_notice("  backtrace:\n");
 	print_stack_trace(&trace, 4);