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net: atm: Use IS_ENABLED in atm_dev_ioctl

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When building with -Wsometimes-uninitialized, Clang warns:

net/atm/resources.c:256:6: warning: variable 'number' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized]
net/atm/resources.c:212:7: warning: variable 'iobuf_len' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized]

Clang won't realize that compat is 0 when CONFIG_COMPAT is not set until
the constant folding stage, which happens after this semantic analysis.
Use IS_ENABLED instead so that the zero is present at the semantic
analysis stage, which eliminates this warning.

Link: https://github.com/ClangBuiltLinux/linux/issues/386
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Nathan Chancellor 2019-03-07 09:57:42 -07:00 • committed by David S. Miller
parent 3499e87ea0
commit f9d19a7494
1 changed files with 2 additions and 6 deletions
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8
net/atm/resources.c
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@ -203,13 +203,9 @@ int atm_dev_ioctl(unsigned int cmd, void __user *arg, int compat)
int __user *sioc_len; int __user *sioc_len;
int __user *iobuf_len; int __user *iobuf_len;
#ifndef CONFIG_COMPAT
compat = 0; /* Just so the compiler _knows_ */
#endif
switch (cmd) { switch (cmd) {
case ATM_GETNAMES: case ATM_GETNAMES:
if (compat) { if (IS_ENABLED(CONFIG_COMPAT) && compat) {
#ifdef CONFIG_COMPAT #ifdef CONFIG_COMPAT
struct compat_atm_iobuf __user *ciobuf = arg; struct compat_atm_iobuf __user *ciobuf = arg;
compat_uptr_t cbuf; compat_uptr_t cbuf;
@ -253,7 +249,7 @@ int atm_dev_ioctl(unsigned int cmd, void __user *arg, int compat)
break; break;
} }
if (compat) { if (IS_ENABLED(CONFIG_COMPAT) && compat) {
#ifdef CONFIG_COMPAT #ifdef CONFIG_COMPAT
struct compat_atmif_sioc __user *csioc = arg; struct compat_atmif_sioc __user *csioc = arg;
compat_uptr_t carg; compat_uptr_t carg;