On Fri, 5 Feb 2010 02:05:56 -0500
Amerigo Wang <amwang@xxxxxxxxxx> wrote:
I got these warnings:
fs/compat_ioctl.c: In function ___compat_sys_ioctl':
fs/compat_ioctl.c:534: warning: ___karg' may be used uninitialized in this function
fs/compat_ioctl.c:533: warning: ___kcmd' may be used uninitialized in this function
fs/compat_ioctl.c:656: warning: ___ret' may be used uninitialized in this function
These warnings are harmless, so just shut gcc up.
Signed-off-by: WANG Cong <amwang@xxxxxxxxxx>
Cc: Alexander Viro <viro@xxxxxxxxxxxxxxxxxx>
Cc: Arnd Bergmann <arnd@xxxxxxxx>
---
diff --git a/fs/compat_ioctl.c b/fs/compat_ioctl.c
index c5c45de..2468f80 100644
--- a/fs/compat_ioctl.c
+++ b/fs/compat_ioctl.c
@@ -543,6 +543,8 @@ static int mt_ioctl_trans(unsigned int fd, unsigned int cmd, void __user *argp)
kcmd = MTIOCGET;
karg = &get;
break;
+ default:
+ return -EINVAL;
}
set_fs (KERNEL_DS);
err = sys_ioctl (fd, kcmd, (unsigned long)karg);
@@ -653,7 +655,7 @@ static int set_raw32_request(struct raw_config_request *req, struct raw32_config
static int raw_ioctl(unsigned fd, unsigned cmd,
struct raw32_config_request __user *user_req)
{
- int ret;
+ int ret = -EINVAL;
switch (cmd) {
case RAW_SETBIND:
Unfortunately that adds more code for something which cannot happen at
runtime.
I guess we could do this trick:
--- a/fs/compat_ioctl.c~a
+++ a/fs/compat_ioctl.c
@@ -539,7 +539,7 @@ static int mt_ioctl_trans(unsigned int f
kcmd = MTIOCPOS;
karg = &pos;
break;
- case MTIOCGET32:
+ default: /* MTIOCGET32 */
kcmd = MTIOCGET;
karg = &get;
break;
@@ -657,7 +657,7 @@ static int raw_ioctl(unsigned fd, unsign
switch (cmd) {
case RAW_SETBIND:
- case RAW_GETBIND: {
+ default: { /* RAW_GETBIND */
struct raw_config_request req;
mm_segment_t oldfs = get_fs();
_
Which actually reduces code:
akpm:/usr/src/25> size fs/compat_ioctl.o
text data bss dec hex filename
9012 2232 2864 14108 371c fs/compat_ioctl.o
8968 2232 2848 14048 36e0 fs/compat_ioctl.o