linux-kernel - [PATCH 1/2 v2] sh: mcount.S: fix build error when PRINTK is not enabled

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Date:   Mon, 15 Nov 2021 19:36:54 -0800
From:   Randy Dunlap <rdunlap@...radead.org>
To:     linux-kernel@...r.kernel.org
Cc:     Randy Dunlap <rdunlap@...radead.org>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Rich Felker <dalias@...c.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>
Subject: [PATCH 1/2 v2] sh: mcount.S: fix build error when PRINTK is not enabled

Fix a build error in mcount.S when CONFIG_PRINTK is not enabled.
Fixes this build error:

sh2-linux-ld: arch/sh/lib/mcount.o: in function `stack_panic':
(.text+0xec): undefined reference to `dump_stack'

Fixes: e460ab27b6c3e ("sh: Fix up stack overflow check with ftrace disabled.")
Signed-off-by: Randy Dunlap <rdunlap@...radead.org>
Cc: Yoshinori Sato <ysato@...rs.sourceforge.jp>
Cc: Rich Felker <dalias@...c.org>
Suggested-by: Geert Uytterhoeven <geert@...ux-m68k.org>
---
v2: add PRINTK to STACK_DEBUG dependency (thanks, Geert)

 arch/sh/Kconfig.debug |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- linux-next-20211115.orig/arch/sh/Kconfig.debug
+++ linux-next-20211115/arch/sh/Kconfig.debug
@@ -15,7 +15,7 @@ config SH_STANDARD_BIOS
 
 config STACK_DEBUG
 	bool "Check for stack overflows"
-	depends on DEBUG_KERNEL
+	depends on DEBUG_KERNEL && PRINTK
 	help
 	  This option will cause messages to be printed if free stack space
 	  drops below a certain limit. Saying Y here will add overhead to