linux-kernel - [PATCH -v3 14/14] x86, mm: Map ISA area with connected ram range at the same time

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Date:	Tue,  4 Sep 2012 22:46:31 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...e.hu>,
	"H. Peter Anvin" <hpa@...or.com>, Jacob Shin <jacob.shin@....com>,
	Tejun Heo <tj@...nel.org>
Cc:	linux-kernel@...r.kernel.org, Yinghai Lu <yinghai@...nel.org>
Subject: [PATCH -v3 14/14] x86, mm: Map ISA area with connected ram range at the same time

so could reduce one loop.

Signed-off-by: Yinghai Lu <yinghai@...nel.org>
---
 arch/x86/mm/init.c |   21 ++++++++++++++-------
 1 files changed, 14 insertions(+), 7 deletions(-)

diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c
index 6663f61..e69f832 100644
--- a/arch/x86/mm/init.c
+++ b/arch/x86/mm/init.c
@@ -248,20 +248,27 @@ static void __init walk_ram_ranges(
 			void *data)
 {
 	unsigned long start_pfn, end_pfn;
+	bool isa_done = false;
 	int i;
 
-	/* the ISA range is always mapped regardless of memory holes */
-	work_fn(0, ISA_END_ADDRESS, data);
-
 	for_each_mem_pfn_range(i, MAX_NUMNODES, &start_pfn, &end_pfn, NULL) {
 		u64 start = start_pfn << PAGE_SHIFT;
 		u64 end = end_pfn << PAGE_SHIFT;
 
-		if (end <= ISA_END_ADDRESS)
-			continue;
+		if (!isa_done && start > ISA_END_ADDRESS) {
+			work_fn(0, ISA_END_ADDRESS, data);
+			isa_done = true;
+		} else {
+			if (end < ISA_END_ADDRESS)
+				continue;
+
+			if (start <= ISA_END_ADDRESS &&
+			    end >= ISA_END_ADDRESS) {
+				start = 0;
+				isa_done = true;
+			}
+		}
 
-		if (start < ISA_END_ADDRESS)
-			start = ISA_END_ADDRESS;
 #ifdef CONFIG_X86_32
 		/* on 32 bit, we only map up to max_low_pfn */
 		if ((start >> PAGE_SHIFT) >= max_low_pfn)
-- 
1.7.7

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