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Date:   Sat, 13 Feb 2021 14:41:59 +0000
From:   Chris Down <>
Cc:     Tony Luck <>, Fenghua Yu <>,,
Subject: [PATCH] ia64: Depend on non-static printk for cmpxchg debug

With !CONFIG_PRINTK, printk() is static in the header, but ia64's
cmpxchg.h with CONFIG_IA64_DEBUG_CMPXCHG doesn't take this into account
before trying to use it as extern, resulting in a compiler error:

    ./include/linux/printk.h:219:5: error: static declaration of 'printk' follows non-static declaration
    219 | int printk(const char *s, ...)
	|     ^~~~~~
    ./arch/ia64/include/uapi/asm/cmpxchg.h:142:14: note: previous declaration of 'printk' was here
    142 |   extern int printk(const char *fmt, ...);  \
	|              ^~~~~~

Make CONFIG_IA64_DEBUG_CMPXCHG dependent on CONFIG_PRINTK to avoid this.

Signed-off-by: Chris Down <>
Reported-by: kernel test robot <>
Cc: Tony Luck <>
Cc: Fenghua Yu <>
 arch/ia64/Kconfig.debug | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/ia64/Kconfig.debug b/arch/ia64/Kconfig.debug
index 40ca23bd228d..2ce008e2d164 100644
--- a/arch/ia64/Kconfig.debug
+++ b/arch/ia64/Kconfig.debug
@@ -39,7 +39,7 @@ config DISABLE_VHPT
 	bool "Turn on compare-and-exchange bug checking (slow!)"
-	depends on DEBUG_KERNEL
+	depends on DEBUG_KERNEL && PRINTK
 	  Selecting this option turns on bug checking for the IA-64
 	  compare-and-exchange instructions.  This is slow!  Itaniums

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