On Sun, Oct 12, 2014 at 10:07:13PM +0100, Al Viro wrote:
> On Sun, Oct 12, 2014 at 03:42:39PM -0500, Eric Biggers wrote:
> > file = anon_inode_getfile(name, fops, priv, flags);
> > if (IS_ERR(file)) {
> > - error = PTR_ERR(file);
> > - goto err_put_unused_fd;
> > + put_unused_fd(fd);
> > + return PTR_ERR(file);
> > }
> > fd_install(fd, file);
>
> at least slap unlikely() on that if (IS_ERR(...))...
That shouldn't be necessary, as far as I can tell; linux/err.h has:
#define IS_ERR_VALUE(x) unlikely((x) >= (unsigned long)-MAX_ERRNO)
...
static inline bool __must_check IS_ERR(__force const void *ptr)
{
return IS_ERR_VALUE((unsigned long)ptr);
}
So unless GCC fails to propagate expected-value handling through static
inline functions, you should never need to write unlikely(IS_ERR(...)).
- Josh Triplett
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