linux-kernel - linux-next: build failure in Linus' tree

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Date:	Sun, 27 Mar 2016 17:06:18 +1100
From:	Stephen Rothwell <sfr@...b.auug.org.au>
To:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	Peter Zijlstra <peterz@...radead.org>
Cc:	linux-next@...r.kernel.org, linux-kernel@...r.kernel.org,
	Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: linux-next: build failure in Linus' tree

Hi all,

After merging the fixes tree, today's linux-next build (perf powerpcle)
failed like this:

arch/powerpc/util/header.c:17:1: error: no previous prototype for 'get_cpuid' [-Werror=missing-prototypes]
 get_cpuid(char *buffer, size_t sz)
 ^
arch/powerpc/util/header.c: In function 'get_cpuid':
arch/powerpc/util/header.c:24:7: error: implicit declaration of function 'scnprintf' [-Werror=implicit-function-declaration]
  nb = scnprintf(buffer, sz, "%lu,%lu$", PVR_VER(pvr), PVR_REV(pvr));
       ^
arch/powerpc/util/header.c:24:2: error: nested extern declaration of 'scnprintf' [-Werror=nested-externs]
  nb = scnprintf(buffer, sz, "%lu,%lu$", PVR_VER(pvr), PVR_REV(pvr));
  ^

Caused by commit

  531d2410635c ("perf tools: Do not include stringify.h from the kernel sources")

I added the following fix patch for for today:

From: Stephen Rothwell <sfr@...b.auug.org.au>
Date: Sun, 27 Mar 2016 14:44:26 +1100
Subject: [PATCH] perf tools: we stil need header.h for various things

Fixes:  531d2410635c ("perf tools: Do not include stringify.h from the kernel sources")
Signed-off-by: Stephen Rothwell <sfr@...b.auug.org.au>
---
 tools/perf/arch/powerpc/util/header.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/tools/perf/arch/powerpc/util/header.c b/tools/perf/arch/powerpc/util/header.c
index 6138bdef6e63..8a0191a11f87 100644
--- a/tools/perf/arch/powerpc/util/header.c
+++ b/tools/perf/arch/powerpc/util/header.c
@@ -5,6 +5,8 @@
 #include <string.h>
 #include <linux/stringify.h>
 
+#include "../../util/header.h"
+
 #define mfspr(rn)       ({unsigned long rval; \
 			 asm volatile("mfspr %0," __stringify(rn) \
 				      : "=r" (rval)); rval; })
-- 
2.7.0

-- 
Cheers,
Stephen Rothwell