diff options
| author | Jean-Sébastien Pédron <dumbbell@FreeBSD.org> | 2022-11-11 23:03:25 +0300 |
|---|---|---|
| committer | Jean-Sébastien Pédron <dumbbell@FreeBSD.org> | 2022-11-11 23:03:25 +0300 |
| commit | 208d02fd5d165389aed0c2b60519cb6b0f5b89f9 (patch) | |
| tree | d0f90911bf82ca1ad4efb2c685bbef02d5ecf356 | |
| parent | 86a1c5d1294579d6787811a5d9cde2aad2567cd9 (diff) | |
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
| -rw-r--r-- | sys/compat/linuxkpi/common/include/linux/slab.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/sys/compat/linuxkpi/common/include/linux/slab.h b/sys/compat/linuxkpi/common/include/linux/slab.h index 8f1cb433c36b..915f33acf67e 100644 --- a/sys/compat/linuxkpi/common/include/linux/slab.h +++ b/sys/compat/linuxkpi/common/include/linux/slab.h @@ -90,6 +90,8 @@ struct linux_kmem_cache; /* drm-kmod 5.4 compat */ #define kfree_async(ptr) kfree(ptr); +#define ZERO_OR_NULL_PTR(x) ((x) == NULL) + static inline gfp_t linux_check_m_flags(gfp_t flags) { |