Messages in this thread | | | Date | Tue, 23 May 2023 12:26:32 +0800 | Subject | Re: [PATCH] drm/drm_vblank.c: avoid unsigned int to signed int cast | From | Sui Jingfeng <> |
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Hi,
On 2023/5/22 19:29, Jani Nikula wrote: > In general, do not use unsigned types in arithmethic to avoid negative > values, because most people will be tripped over by integer promotion > rules, and you'll get negative values anyway.
Here I'm sure about this,
but there are plenty unsigned types arithmetic in the kernel.
take kmalloc_array() function as an example in /tools/virto/linux/kernel.h
static inline void *kmalloc_array(unsigned n, size_t s, gfp_t gfp) { return kmalloc(n * s, gfp); }
NOTE that *size_t* is an unsigned integral data type.
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