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Subject[PATCH 2/6] mqueue: apply mathematics distributivity on mq_bytes calculation
Date
Code size reduction:
text data bss dec hex filename
9941 72 16 10029 272d ipc/mqueue-BEFORE.o
9925 72 16 10013 271d ipc/mqueue-AFTER.o

Signed-off-by: André Goddard Rosa <andre.goddard@gmail.com>
---
ipc/mqueue.c | 9 +++++----
1 files changed, 5 insertions(+), 4 deletions(-)
diff --git a/ipc/mqueue.c b/ipc/mqueue.c
index 2d76647..04403fd 100644
--- a/ipc/mqueue.c
+++ b/ipc/mqueue.c
@@ -261,8 +261,9 @@ static void mqueue_delete_inode(struct inode *inode)

clear_inode(inode);

- mq_bytes = (info->attr.mq_maxmsg * sizeof(struct msg_msg *) +
- (info->attr.mq_maxmsg * info->attr.mq_msgsize));
+ /* Total amount of bytes accounted for the mqueue */
+ mq_bytes = info->attr.mq_maxmsg * (sizeof(struct msg_msg *)
+ + info->attr.mq_msgsize);
user = info->user;
if (user) {
spin_lock(&mq_lock);
@@ -601,8 +602,8 @@ static int mq_attr_ok(struct ipc_namespace *ipc_ns, struct mq_attr *attr)
/* check for overflow */
if (attr->mq_msgsize > ULONG_MAX/attr->mq_maxmsg)
return 0;
- if ((unsigned long)(attr->mq_maxmsg * attr->mq_msgsize) +
- (attr->mq_maxmsg * sizeof (struct msg_msg *)) <
+ if ((unsigned long)(attr->mq_maxmsg * (attr->mq_msgsize
+ + sizeof (struct msg_msg *))) <
(unsigned long)(attr->mq_maxmsg * attr->mq_msgsize))
return 0;
return 1;
--
1.7.0.87.g0901d
--
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