linux-kernel - [PATCH RESEND 2/3] x86, mm: Update min_pfn_mapped in add_pfn_range

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Date:	Mon, 2 Sep 2013 18:30:28 +0800
From:	Tang Chen <tangchen@...fujitsu.com>
To:	mingo@...hat.com, hpa@...or.com, yinghai@...nel.org,
	penberg@...nel.org, jacob.shin@....com, tglx@...utronix.de,
	lenb@...nel.org, rjw@...k.pl
Cc:	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
	x86@...nel.org
Subject: [PATCH RESEND 2/3] x86, mm: Update min_pfn_mapped in add_pfn_range_mapped().

In current kernel, we update min_pfn_mapped and max_pfn_mapped like this:

init_mem_mapping()
{
	while ( a loop iterates all memory ranges ) {
		init_range_memory_mapping();
		 |->init_memory_mapping()
		     |->kernel_physical_mapping_init()
		     |->add_pfn_range_mapped()
		         |-> update max_pfn_mapped;

		update min_pfn_mapped;
	}
}

max_pfn_mapped is updated in add_pfn_range_mapped() when a range of memory
is mapped. But min_pfn_mapped is updated in init_mem_mapping(). We can also
update min_pfn_mapped in add_pfn_range_mapped().

Signed-off-by: Tang Chen <tangchen@...fujitsu.com>
---
 arch/x86/mm/init.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c
index 5b2eaca..a97749f 100644
--- a/arch/x86/mm/init.c
+++ b/arch/x86/mm/init.c
@@ -313,6 +313,7 @@ static void add_pfn_range_mapped(unsigned long start_pfn, unsigned long end_pfn)
 	nr_pfn_mapped = clean_sort_range(pfn_mapped, E820_X_MAX);
 
 	max_pfn_mapped = max(max_pfn_mapped, end_pfn);
+	min_pfn_mapped = min(min_pfn_mapped, start_pfn);
 }
 
 bool pfn_range_is_mapped(unsigned long start_pfn, unsigned long end_pfn)
@@ -442,7 +443,6 @@ void __init init_mem_mapping(void)
 		new_mapped_ram_size = init_range_memory_mapping(start,
 							last_start);
 		last_start = start;
-		min_pfn_mapped = last_start >> PAGE_SHIFT;
 		/* only increase step_size after big range get mapped */
 		if (new_mapped_ram_size > mapped_ram_size)
 			step_size <<= STEP_SIZE_SHIFT;
-- 
1.7.1

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