linux-kernel - [PATCH 1/2] x86: Drop support for /proc files when !CONFIG_PROC

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Date:	Sat, 22 Feb 2014 11:08:50 -0800
From:	Josh Triplett <josh@...htriplett.org>
To:	Andi Kleen <ak@...ux.intel.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Borislav Petkov <bp@...e.de>, Feng Tang <feng.tang@...el.com>,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
	Jacob Shin <jacob.shin@....com>,
	Jan Beulich <JBeulich@...e.com>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Qiaowei Ren <qiaowei.ren@...el.com>,
	Rob Landley <rob@...dley.net>,
	Seiji Aguchi <seiji.aguchi@....com>,
	Stephane Eranian <eranian@...gle.com>,
	Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Thomas Renninger <trenn@...e.de>, linux-kernel@...r.kernel.org,
	x86@...nel.org
Subject: [PATCH 1/2] x86: Drop support for /proc files when !CONFIG_PROC_FS

arch/x86/kernel/cpu/proc.c only exists to support files in /proc; omit that
file when compiling without CONFIG_PROC_FS.

Saves 645 additional bytes on 32-bit x86 when !CONFIG_PROC_FS:

add/remove: 0/5 grow/shrink: 0/0 up/down: 0/-645 (-645)
function                                     old     new   delta
c_stop                                         1       -      -1
c_next                                        11       -     -11
cpuinfo_op                                    16       -     -16
c_start                                       24       -     -24
show_cpuinfo                                 593       -    -593

Signed-off-by: Josh Triplett <josh@...htriplett.org>
---
 arch/x86/kernel/cpu/Makefile | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kernel/cpu/Makefile b/arch/x86/kernel/cpu/Makefile
index 7fd54f0..64038d8 100644
--- a/arch/x86/kernel/cpu/Makefile
+++ b/arch/x86/kernel/cpu/Makefile
@@ -13,10 +13,12 @@ nostackp := $(call cc-option, -fno-stack-protector)
 CFLAGS_common.o		:= $(nostackp)
 
 obj-y			:= intel_cacheinfo.o scattered.o topology.o
-obj-y			+= proc.o capflags.o powerflags.o common.o
+obj-y			+= capflags.o powerflags.o common.o
 obj-y			+= rdrand.o
 obj-y			+= match.o
 
+obj-$(CONFIG_PROC_FS)	+= proc.o
+
 obj-$(CONFIG_X86_32)	+= bugs.o
 obj-$(CONFIG_X86_64)	+= bugs_64.o
 
-- 
1.9.0

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