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Use __attribute__((malloc)) on memory allocation functions

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This informs the C compiler that pointers returned from these functions
do not alias other functions, which allows it to do better code
optimization and should make the compiled code smaller.

References:
https://stackoverflow.com/a/53654773
https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html#index-malloc-function-attribute
https://clang.llvm.org/docs/AttributeReference.html#malloc

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Richard Yao <richard.yao@alumni.stonybrook.edu>
Closes #14827
This commit is contained in:
Richard Yao
2023-05-26 18:47:52 -04:00
committed by GitHub
parent 20494d47d2
commit 0f03a41161
5 changed files with 23 additions and 14 deletions
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lib/libspl/include/umem.h
+4 -3
View File
@@ -83,7 +83,7 @@ const char *_umem_debug_init(void);
const char *_umem_options_init(void);
const char *_umem_logging_init(void);
__attribute__((alloc_size(1)))
__attribute__((malloc, alloc_size(1)))
static inline void *
umem_alloc(size_t size, int flags)
{
@@ -96,7 +96,7 @@ umem_alloc(size_t size, int flags)
return (ptr);
}
__attribute__((alloc_size(1)))
__attribute__((malloc, alloc_size(1)))
static inline void *
umem_alloc_aligned(size_t size, size_t align, int flags)
{
@@ -118,7 +118,7 @@ umem_alloc_aligned(size_t size, size_t align, int flags)
return (ptr);
}
__attribute__((alloc_size(1)))
__attribute__((malloc, alloc_size(1)))
static inline void *
umem_zalloc(size_t size, int flags)
{
@@ -188,6 +188,7 @@ umem_cache_destroy(umem_cache_t *cp)
umem_free(cp, sizeof (umem_cache_t));
}
__attribute__((malloc))
static inline void *
umem_cache_alloc(umem_cache_t *cp, int flags)
{