linux-kernel - [PATCH 1/8] LoongArch: Add CONFIG_CC_HAS_EXPLICIT

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Date:   Sun, 28 Aug 2022 01:54:29 +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 1/8] LoongArch: Add CONFIG_CC_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.  We need to adapt the kernel for this change,
introduce CONFIG_CC_HAS_EXPLICIT_RELOCS so we can use it in later
patches.

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 810096bbf853..e7cfd451024b 100644
--- a/arch/loongarch/Kconfig
+++ b/arch/loongarch/Kconfig
@@ -203,6 +203,9 @@ config SCHED_OMIT_FRAME_POINTER
 	bool
 	default y
 
+config CC_HAS_EXPLICIT_RELOCS
+	def_bool $(cc-option,-mexplicit-relocs) && $(as-instr,x:pcalau12i \$t0$(comma)%pc_hi20(x))
+
 menu "Kernel type and options"
 
 source "kernel/Kconfig.hz"
-- 
2.37.0