linux-kernel - [PATCH] Documentation/prctl: don't build tsc tests when cross compiling

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Date:	Sat, 20 Jun 2015 21:22:20 -0400
From:	Paul Gortmaker <paul.gortmaker@...driver.com>
To:	<linux-kernel@...r.kernel.org>
CC:	Paul Gortmaker <paul.gortmaker@...driver.com>,
	Jonathan Corbet <corbet@....net>, <linux-doc@...r.kernel.org>,
	Erik Bosman <ejbosman@...vu.nl>
Subject: [PATCH] Documentation/prctl: don't build tsc tests when cross compiling

The following was seen in linux-next build coverage, which is somewhat
unique since it uses powerpc host to cross compile x86:

Documentation/prctl/disable-tsc-on-off-stress-test.c:36:1: error:
 impossible register constraint in 'asm'
Documentation/prctl/disable-tsc-ctxt-sw-stress-test.c:34:1: error:
 impossible register constraint in 'asm'
Documentation/prctl/disable-tsc-test.c:36:1: error: impossible
 register constraint in 'asm'

It probably makes sense to just skip building these tests when
we are cross compiling.

Cc: Jonathan Corbet <corbet@....net>
Cc: linux-doc@...r.kernel.org
Cc: Erik Bosman <ejbosman@...vu.nl>
Signed-off-by: Paul Gortmaker <paul.gortmaker@...driver.com>
---
 Documentation/prctl/Makefile | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Documentation/prctl/Makefile b/Documentation/prctl/Makefile
index 2948b7b124b9..44de3080c7f2 100644
--- a/Documentation/prctl/Makefile
+++ b/Documentation/prctl/Makefile
@@ -1,3 +1,4 @@
+ifndef CROSS_COMPILE
 # List of programs to build
 hostprogs-$(CONFIG_X86) := disable-tsc-ctxt-sw-stress-test disable-tsc-on-off-stress-test disable-tsc-test
 # Tell kbuild to always build the programs
@@ -6,3 +7,4 @@ always := $(hostprogs-y)
 HOSTCFLAGS_disable-tsc-ctxt-sw-stress-test.o += -I$(objtree)/usr/include
 HOSTCFLAGS_disable-tsc-on-off-stress-test.o += -I$(objtree)/usr/include
 HOSTCFLAGS_disable-tsc-test.o += -I$(objtree)/usr/include
+endif
-- 
2.2.1

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