linux-kernel - [PATCH v7 1/5] LoongArch: Add CONFIG_AS_HAS_EXPLICIT

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Date:   Tue, 30 Aug 2022 18:48:02 +0800
From:   Xi Ruoyao <xry111@...111.site>
To:     loongarch@...ts.linux.dev
Cc:     linux-kernel@...r.kernel.org, WANG Xuerui <kernel@...0n.name>,
        Huacai Chen <chenhuacai@...nel.org>,
        Youling Tang <tangyouling@...ngson.cn>,
        Jinyang He <hejinyang@...ngson.cn>,
        Xi Ruoyao <xry111@...111.site>
Subject: [PATCH v7 1/5] LoongArch: Add CONFIG_AS_HAS_EXPLICIT_RELOCS

GNU as >= 2.40 and GCC >= 13 will support using explicit relocation
hints in the assembly code, instead of la.* macros.  The usage of
explicit relocation hints can improve code generation so it's enabled
by default by GCC >= 13.

Introduce CONFIG_AS_HAS_EXPLICIT_RELOCS as the switch for
"use explicit relocation hints or not."

Signed-off-by: Xi Ruoyao <xry111@...111.site>
---
 arch/loongarch/Kconfig | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/loongarch/Kconfig b/arch/loongarch/Kconfig
index d3ce96a1a744..0721b4b2207a 100644
--- a/arch/loongarch/Kconfig
+++ b/arch/loongarch/Kconfig
@@ -204,6 +204,9 @@ config SCHED_OMIT_FRAME_POINTER
 	bool
 	default y
 
+config AS_HAS_EXPLICIT_RELOCS
+	def_bool $(as-instr,x:pcalau12i \$t0$(comma)%pc_hi20(x))
+
 menu "Kernel type and options"
 
 source "kernel/Kconfig.hz"
-- 
2.37.0