Re: kfree(NULL)

[Jan Engelhardt <jengelh@linux01.gwdg.de>]

>> Maybe kfree should really be a wrapper around __kfree which does the real
>> work.  Then kfree could be a inlined function or a #define that does the NULL
>> pointer check.
>
>NULL pointer check in kfree saves lot of small code fragments in callers.
>It is one of many reasons why kfree does it.
>Making kfree inline wrapper eliminates this save.

How about

slab.h:
#ifndef CONFIG_OPTIMIZING_FOR_SIZE
static inline void kfree(const void *p) {
    if(p != NULL)
        __kfree(p);
}
#else
extern void kfree(const void *);
#endif

slab.c:
#ifdef CONFIG_OPTIMIZING_FOR_SIZE
void kfree(const void *p) {
    if(p != NUILL)
        _kfree(p);
}
#endif

That way, you get your time saving with -O2 and your space saving with -Os.


Jan Engelhardt
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