This is a note to let you know that I've just added the patch titled ia64: don't do IA64_CMPXCHG_DEBUG without CONFIG_PRINTK to the 5.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: ia64-don-t-do-ia64_cmpxchg_debug-without-config_prin.patch and it can be found in the queue-5.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit 45cb0719107f0eab438d121355bcf7ce887d759d Author: Randy Dunlap <rdunlap@xxxxxxxxxxxxx> Date: Sun Sep 26 10:12:24 2021 -0700 ia64: don't do IA64_CMPXCHG_DEBUG without CONFIG_PRINTK [ Upstream commit c15b5fc054c3d6c97e953617605235c5cb8ce979 ] When CONFIG_PRINTK is not set, the CMPXCHG_BUGCHECK() macro calls _printk(), but _printk() is a static inline function, not available as an extern. Since the purpose of the macro is to print the BUGCHECK info, make this config option depend on PRINTK. Fixes multiple occurrences of this build error: ../include/linux/printk.h:208:5: error: static declaration of '_printk' follows non-static declaration 208 | int _printk(const char *s, ...) | ^~~~~~~ In file included from ../arch/ia64/include/asm/cmpxchg.h:5, ../arch/ia64/include/uapi/asm/cmpxchg.h:146:28: note: previous declaration of '_printk' with type 'int(const char *, ...)' 146 | extern int _printk(const char *fmt, ...); Cc: linux-ia64@xxxxxxxxxxxxxxx Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> Cc: Tony Luck <tony.luck@xxxxxxxxx> Cc: Chris Down <chris@xxxxxxxxxxxxxx> Cc: Paul Gortmaker <paul.gortmaker@xxxxxxxxxxxxx> Cc: John Paul Adrian Glaubitz <glaubitz@xxxxxxxxxxxxxxxxxxx> Signed-off-by: Randy Dunlap <rdunlap@xxxxxxxxxxxxx> Signed-off-by: Petr Mladek <pmladek@xxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/arch/ia64/Kconfig.debug b/arch/ia64/Kconfig.debug index 40ca23bd228d6..2ce008e2d1644 100644 --- a/arch/ia64/Kconfig.debug +++ b/arch/ia64/Kconfig.debug @@ -39,7 +39,7 @@ config DISABLE_VHPT config IA64_DEBUG_CMPXCHG bool "Turn on compare-and-exchange bug checking (slow!)" - depends on DEBUG_KERNEL + depends on DEBUG_KERNEL && PRINTK help Selecting this option turns on bug checking for the IA-64 compare-and-exchange instructions. This is slow! Itaniums