linux-kernel - [PATCH] x86: mm: Remove unnecessary assignment for max_pfn

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Date:	Fri, 10 May 2013 17:01:12 +0800
From:	Zhang Yanfei <zhangyanfei@...fujitsu.com>
To:	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>
CC:	yinghai@...nel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH] x86: mm: Remove unnecessary assignment for max_pfn_mapped:q

init_memory_mapping will set max_pfn_mapped:
int_memory_mapping
  --> add_pfn_range_mapped
    --> max_pfn_mapped = max(max_pfn_mapped, end_pfn)

In init_mem_mapping, before we set max_pfn_mapped to 0, we
have already called init_memory_mapping to setup pagetable
for [0, ISA_END_ADDRESS], and that sets max_pfn_mapped. So
the assignment to 0 is not necessary, remove it.

Signed-off-by: Zhang Yanfei <zhangyanfei@...fujitsu.com>
Cc: "H. Peter Anvin" <hpa@...or.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Yinghai Lu <yinghai@...nel.org>
---
 arch/x86/mm/init.c |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)

diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c
index fdc5dca..404c889 100644
--- a/arch/x86/mm/init.c
+++ b/arch/x86/mm/init.c
@@ -416,7 +416,6 @@ void __init init_mem_mapping(void)
 
 	/* step_size need to be small so pgt_buf from BRK could cover it */
 	step_size = PMD_SIZE;
-	max_pfn_mapped = 0; /* will get exact value next */
 	min_pfn_mapped = real_end >> PAGE_SHIFT;
 	last_start = start = real_end;
 	while (last_start > ISA_END_ADDRESS) {
-- 
1.7.1

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