On Thursday, May 11, 2017 04:27:19 PM Bartlomiej Zolnierkiewicz wrote:
> > @@ -358,11 +358,7 @@ static int __init vrfb_probe(struct platform_device *pdev)
> > return PTR_ERR(vrfb_base);
> >
> > num_ctxs = pdev->num_resources - 1;
> > -
> > - ctxs = devm_kzalloc(&pdev->dev,
> > - sizeof(struct vrfb_ctx) * num_ctxs,
> > - GFP_KERNEL);
> > -
> > + ctxs = devm_kcalloc(&pdev->dev, num_ctxs, sizeof(*ctxs), GFP_KERNEL);
>
> This change makes the resulting binary larger by 24 bytes (probably
> because of the need to have an additional function argument) and
24 bytes seemed too much for just an additional function argument
so I've checked the source:
static inline void *devm_kzalloc(struct device *dev, size_t size, gfp_t gfp)
{
return devm_kmalloc(dev, size, gfp | __GFP_ZERO);
}
static inline void *devm_kmalloc_array(struct device *dev,
size_t n, size_t size, gfp_t flags)
{
if (size != 0 && n > SIZE_MAX / size)
return NULL;
return devm_kmalloc(dev, n * size, flags);
}
static inline void *devm_kcalloc(struct device *dev,
size_t n, size_t size, gfp_t flags)
{
return devm_kmalloc_array(dev, n, size, flags | __GFP_ZERO);
}
The extra kcalloc() checks are inlined currently into each instance.
Best regards,
--
Bartlomiej Zolnierkiewicz
Samsung R&D Institute Poland
Samsung Electronics
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