On Tue, 18 Mar 2014, Joe Perches wrote:
But using "if (0)" prevents the no_printk from occurring at all so there
would be no side-effects and the format & args would still be verified
by the compiler.
I'd prefer this (for symmetry and clarity):
#if NDEBUG
#define dprintk(flg, fmt, ...) \
do { if ((NDEBUG) & (flg)) pr_debug(fmt, ## __VA_ARGS__); } while (0)
#else
#define dprintk(flg, fmt, ...) \
do { if (0) pr_debug(fmt, ## __VA_ARGS__); } while (0)
#endif
But you seem to be asking for this instead:
#if NDEBUG
#define dprintk(flg, fmt, ...) \
do { if ((NDEBUG) & (flg)) pr_debug(fmt, ## __VA_ARGS__); } while (0)
#else
#define dprintk(flg, fmt, ...) \
do { if (0) no_printk(fmt, ## __VA_ARGS__); } while (0)
#endif
Why is that better?
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