[PATCH] x86: mm: Remove unnecessary assignment for max_pfn_mapped:q

Zhang Yanfei
2013-05-10T09:03:33Z

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@cn.fujitsu.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Yinghai Lu <yinghai@kernel.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