mm/slab: call kmalloc_noprof() unconditionally in kmalloc_array_noprof()

If 'n' or 'size' isn't builtin constant, we used to call __kmalloc()
before commit 7bd230a ("mm/slab: enable slab allocation tagging for
kmalloc and friends"), which inadvertedly changed both paths to
kmalloc_noprof().

As Harry Yoo points out we can just call kmalloc_noprof()
unconditionally. If the compiler knows n and size are constants it
doesn't guarantee that bytes will be also seen as constant, and that is
the important test in kmalloc_noprof() anyway, so we can just defer to
it always.

[ [email protected]: change as Harry suggested and adjust commit log ]

Fixes: 7bd230a ("mm/slab: enable slab allocation tagging for kmalloc and friends")
Signed-off-by: Ye Bin <[email protected]>
Reviewed-by: Harry Yoo <[email protected]>
Signed-off-by: Vlastimil Babka <[email protected]>

Author: Ye Bin

include/linux/slab.h

@@ -941,8 +941,6 @@ static inline __alloc_size(1, 2) void *kmalloc_array_noprof(size_t n, size_t siz
 
 	if (unlikely(check_mul_overflow(n, size, &bytes)))
 		return NULL;
-	if (__builtin_constant_p(n) && __builtin_constant_p(size))
-		return kmalloc_noprof(bytes, flags);
 	return kmalloc_noprof(bytes, flags);
 }
 #define kmalloc_array(...)			alloc_hooks(kmalloc_array_noprof(__VA_ARGS__))