linuxkpi: Define ZERO_OR_NULL_PTR()
in <linux/slab.h>
On Linux, the `kmalloc()` family of functions returns a special value if the size of the allocation is zero. This macro verifies if the pointer is NULL (the allocation failed) or the size is 0 (the allocation was not performed AFAIU). This special value can be passed to `kfree()`. On FreeBSD, our `malloc(9)` functions don't return a special value for 0-size allocations. Therefore we can simply compare the result against NULL. Reviewed by: manu Approved by: manu Differential Revision: https://reviews.freebsd.org/D37367
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@ -90,6 +90,8 @@ struct linux_kmem_cache;
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/* drm-kmod 5.4 compat */
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#define kfree_async(ptr) kfree(ptr);
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#define ZERO_OR_NULL_PTR(x) ((x) == NULL)
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static inline gfp_t
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linux_check_m_flags(gfp_t flags)
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{
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