linux-kernel - [PATCH] riscv: fix -Wundef warning for CONFIG_RISCV_BOOT

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Message-Id: <20230106161213.2374093-1-masahiroy@kernel.org>
Date:   Sat,  7 Jan 2023 01:12:13 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        linux-riscv@...ts.infradead.org
Cc:     linux-kernel@...r.kernel.org,
        Masahiro Yamada <masahiroy@...nel.org>,
        Alexandre Ghiti <alexandre.ghiti@...onical.com>,
        Anup Patel <anup@...infault.org>,
        Atish Patra <atishp@...osinc.com>, Guo Ren <guoren@...nel.org>,
        Jisheng Zhang <jszhang@...nel.org>,
        Myrtle Shah <gatecat@....me>
Subject: [PATCH] riscv: fix -Wundef warning for CONFIG_RISCV_BOOT_SPINWAIT

Since commit 80b6093b55e3 ("kbuild: add -Wundef to KBUILD_CPPFLAGS
for W=1 builds"), building with W=1 detects misuse of #if.

  $ make W=1 ARCH=riscv CROSS_COMPILE=riscv64-linux-gnu- arch/riscv/kernel/
    [snip]
    AS      arch/riscv/kernel/head.o
  arch/riscv/kernel/head.S:329:5: warning: "CONFIG_RISCV_BOOT_SPINWAIT" is not defined, evaluates to 0 [-Wundef]
    329 | #if CONFIG_RISCV_BOOT_SPINWAIT
        |     ^~~~~~~~~~~~~~~~~~~~~~~~~~

CONFIG_RISCV_BOOT_SPINWAIT is a bool option. #ifdef should be used.

Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
---

 arch/riscv/kernel/head.S | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/riscv/kernel/head.S b/arch/riscv/kernel/head.S
index b865046e4dbb..4bf6c449d78b 100644
--- a/arch/riscv/kernel/head.S
+++ b/arch/riscv/kernel/head.S
@@ -326,7 +326,7 @@ clear_bss_done:
 	call soc_early_init
 	tail start_kernel
 
-#if CONFIG_RISCV_BOOT_SPINWAIT
+#ifdef CONFIG_RISCV_BOOT_SPINWAIT
 .Lsecondary_start:
 	/* Set trap vector to spin forever to help debug */
 	la a3, .Lsecondary_park
-- 
2.34.1