linux-kernel - checkpatch.pl: Use of extern in function prototype

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Date:	Mon, 18 Aug 2014 15:09:22 +0530
From:	Arun Chandran <achandran@...sta.com>
To:	linux-kernel@...r.kernel.org
Cc:	Andy Whitcroft <apw@...onical.com>, Joe Perches <joe@...ches.com>,
	Geoff Levand <geoff@...radead.org>,
	Mark Rutland <mark.rutland@....com>
Subject: checkpatch.pl: Use of extern in function prototype

Hi,

I have a piece of code as shown below.

#######################
diff --git a/arch/arm64/include/asm/proc-fns.h
b/arch/arm64/include/asm/proc-fns.h
index 9a8fd84..86be4f9 100644
--- a/arch/arm64/include/asm/proc-fns.h
+++ b/arch/arm64/include/asm/proc-fns.h
@@ -32,7 +32,7 @@ extern void cpu_cache_off(void);
 extern void cpu_do_idle(void);
 extern void cpu_do_switch_mm(unsigned long pgd_phys, struct mm_struct *mm);
 extern void cpu_reset(unsigned long addr) __attribute__((noreturn));
+extern void cpu_soft_restart(phys_addr_t cpu_reset,
                unsigned long addr) __attribute__((noreturn));
 extern void cpu_do_suspend(struct cpu_suspend_ctx *ptr);
 extern u64 cpu_do_resume(phys_addr_t ptr, u64 idmap_ttbr);
########################

Other lines had an "extern" in them I also added it blindly.
when the above code is given checkpatch.pl did not throw any
error/warning,; but I got this reply

http://lists.infradead.org/pipermail/linux-arm-kernel/2014-August/279691.html

[[As the functions have external linkage by default, the extern keyword is
irrelevant in this case.]]

Does checkpatch.pl misbehave in my case?

--Arun
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