mirror of
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
synced 2025-09-04 20:19:47 +08:00
1690905240
There are multiple instances in the kernel where we need to include or exclude particular instructions based on the ISA revision of the target processor. For MIPS32 / MIPS64, the compiler exports a __mips_isa_rev define. However, when targeting MIPS I - V, this define is absent. This leads to each use of __mips_isa_rev having to check that it is defined first. To simplify this, introduce the isa-rev.h header which always exports MIPS_ISA_REV. The name is changed so as to avoid confusion with the compiler builtin and to avoid accidentally using the builtin. MIPS_ISA_REV is defined to the compilers builtin if provided, or 0, which satisfies all current usages. Suggested-by: Paul Burton <paul.burton@mips.com> Signed-off-by: Matt Redfearn <matt.redfearn@mips.com> Reviewed-by: Maciej W. Rozycki <macro@mips.com> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/18676/ Signed-off-by: James Hogan <jhogan@kernel.org>
25 lines
556 B
C
25 lines
556 B
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/*
|
|
* Copyright (C) 2018 MIPS Tech, LLC
|
|
* Author: Matt Redfearn <matt.redfearn@mips.com>
|
|
*/
|
|
|
|
#ifndef __MIPS_ASM_ISA_REV_H__
|
|
#define __MIPS_ASM_ISA_REV_H__
|
|
|
|
/*
|
|
* The ISA revision level. This is 0 for MIPS I to V and N for
|
|
* MIPS{32,64}rN.
|
|
*/
|
|
|
|
/* If the compiler has defined __mips_isa_rev, believe it. */
|
|
#ifdef __mips_isa_rev
|
|
#define MIPS_ISA_REV __mips_isa_rev
|
|
#else
|
|
/* The compiler hasn't defined the isa rev so assume it's MIPS I - V (0) */
|
|
#define MIPS_ISA_REV 0
|
|
#endif
|
|
|
|
|
|
#endif /* __MIPS_ASM_ISA_REV_H__ */
|