a3f8a30f3f
Instead of using version checks per-compiler to define (or not)
each attribute, use __has_attribute to test for them, following
the cleanup started with commit 815f0ddb34
("include/linux/compiler*.h: make compiler-*.h mutually exclusive"),
which is supported on gcc >= 5, clang >= 2.9 and icc >= 17.
In the meantime, to support 4.6 <= gcc < 5, we implement
__has_attribute by hand.
All the attributes that can be unconditionally defined and directly
map to compiler attribute(s) (even if optional) have been moved
to a new file include/linux/compiler_attributes.h
In an effort to make the file as regular as possible, comments
stating the purpose of attributes have been removed. Instead,
links to the compiler docs have been added (i.e. to gcc and,
if available, to clang as well). In addition, they have been sorted.
Finally, if an attribute is optional (i.e. if it is guarded
by __has_attribute), the reason has been stated for future reference.
Tested-by: Sedat Dilek <sedat.dilek@gmail.com> # on top of v4.19-rc5, clang 7
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Reviewed-by: Luc Van Oostenryck <luc.vanoostenryck@gmail.com>
Signed-off-by: Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>
37 lines
979 B
C
37 lines
979 B
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef __LINUX_COMPILER_TYPES_H
|
|
#error "Please don't include <linux/compiler-intel.h> directly, include <linux/compiler.h> instead."
|
|
#endif
|
|
|
|
#ifdef __ECC
|
|
|
|
/* Some compiler specific definitions are overwritten here
|
|
* for Intel ECC compiler
|
|
*/
|
|
|
|
#include <asm/intrinsics.h>
|
|
|
|
/* Intel ECC compiler doesn't support gcc specific asm stmts.
|
|
* It uses intrinsics to do the equivalent things.
|
|
*/
|
|
|
|
#define barrier() __memory_barrier()
|
|
#define barrier_data(ptr) barrier()
|
|
|
|
#define RELOC_HIDE(ptr, off) \
|
|
({ unsigned long __ptr; \
|
|
__ptr = (unsigned long) (ptr); \
|
|
(typeof(ptr)) (__ptr + (off)); })
|
|
|
|
/* This should act as an optimization barrier on var.
|
|
* Given that this compiler does not have inline assembly, a compiler barrier
|
|
* is the best we can do.
|
|
*/
|
|
#define OPTIMIZER_HIDE_VAR(var) barrier()
|
|
|
|
#endif
|
|
|
|
/* icc has this, but it's called _bswap16 */
|
|
#define __HAVE_BUILTIN_BSWAP16__
|
|
#define __builtin_bswap16 _bswap16
|