Patch "perf powerpc: Fix build-test failure" has been added to the 4.8-stable tree

This is a note to let you know that I've just added the patch titled

perf powerpc: Fix build-test failure

to the 4.8-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:
perf-powerpc-fix-build-test-failure.patch
and it can be found in the queue-4.8 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Ravi Bangoria <[email protected]>
Date: Wed, 31 Aug 2016 13:33:11 +0530
Subject: perf powerpc: Fix build-test failure

From: Ravi Bangoria <[email protected]>

commit 25b8592e912f085ce2ff736a2927584ddeab238c upstream.

'make -C tools/perf build-test' is failing with below log for poewrpc.

In file included from /tmp/tmp.3eEwmGlYaF/perf-4.8.0-rc4/tools/perf/perf.h:15:0,

                   from util/cpumap.h:8,
                   from util/env.c:1:

/tmp/tmp.3eEwmGlYaF/perf-4.8.0-rc4/tools/perf/perf-sys.h:23:56:
fatal error: ../../arch/powerpc/include/uapi/asm/unistd.h: No such file or directory compilation terminated.

I bisected it and found it's failing from commit ad430729ae00 ("Remove:
kernel unistd*h files from perf's MANIFEST, not used").

Header file '../../arch/powerpc/include/uapi/asm/unistd.h' is included only for powerpc in tools/perf/perf-sys.h.

By looking closly at commit history, I found little weird thing:

Commit f2d9cae9ea9e ("perf powerpc: Use uapi/unistd.h to fix build error") replaced 'asm/unistd.h' with 'uapi/asm/unistd.h'

Commit d2709c7ce4c5 ("perf: Make perf build for x86 with UAPI disintegration applied") removes all arch specific 'uapi/asm/unistd.h' for all archs and adds generic <asm/unistd.h>.

Commit f0b9abfb0446 ("Merge branch 'linus' into perf/core") again includes 'uapi/asm/unistd.h' for powerpc. Don't know how exactly this happened as this change is not part of commit also.

---
 tools/perf/perf-sys.h |    1 -
 1 file changed, 1 deletion(-)

@@ -20,7 +20,6 @@
 #endif
 
 #ifdef __powerpc__
-#include "../../arch/powerpc/include/uapi/asm/unistd.h"
 #define CPUINFO_PROC	{"cpu"}
 #endif
 

Patches currently in stable-queue which might be from [email protected] are

queue-4.8/perf-powerpc-fix-build-test-failure.patch