linux-kernel - [PATCH] riscv: enable DEBUG_FORCE_FUNCTION_ALIGN

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Message-Id: <20230727160356.3874-1-jszhang@kernel.org>
Date:   Fri, 28 Jul 2023 00:03:56 +0800
From:   Jisheng Zhang <jszhang@...nel.org>
To:     Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>
Cc:     linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org
Subject: [PATCH] riscv: enable DEBUG_FORCE_FUNCTION_ALIGN_64B

Allow to force all function address 64B aligned as it is possible for
other architectures. This may be useful when verify if performance
bump is caused by function alignment changes.

Before commit 1bf18da62106 ("lib/Kconfig.debug: add ARCH dependency
for FUNCTION_ALIGN option"), riscv supports enabling the
DEBUG_FORCE_FUNCTION_ALIGN_64B option, but after that commit, each
arch needs to claim the support explicitly. I tried the config file in
[1] for both RV64 and RV32, I can't reproduce the build error as [1],
there is no reason for not allowing to enforce this function alignment.

Link: https://lore.kernel.org/lkml/202202271612.W32UJAj2-lkp@intel.com/ [1]
Signed-off-by: Jisheng Zhang <jszhang@...nel.org>
---
 lib/Kconfig.debug | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index fbc89baf7de6..39ffd218e960 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -502,7 +502,7 @@ config SECTION_MISMATCH_WARN_ONLY

 config DEBUG_FORCE_FUNCTION_ALIGN_64B
 	bool "Force all function address 64B aligned"
-	depends on EXPERT && (X86_64 || ARM64 || PPC32 || PPC64 || ARC || S390)
+	depends on EXPERT && (X86_64 || ARM64 || PPC32 || PPC64 || ARC || RISCV || S390)
 	select FUNCTION_ALIGNMENT_64B
 	help
 	  There are cases that a commit from one domain changes the function
-- 
2.40.1