linux-kernel - [PATCH 38/46] x86, mm: use limit

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Message-Id: <1352755122-25660-39-git-send-email-yinghai@kernel.org>
Date:	Mon, 12 Nov 2012 13:18:34 -0800
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>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Stefano Stabellini <stefano.stabellini@...citrix.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	linux-kernel@...r.kernel.org, Yinghai Lu <yinghai@...nel.org>
Subject: [PATCH 38/46] x86, mm: use limit_pfn for end pfn

instead of shifting end to get that.

Signed-off-by: Yinghai Lu <yinghai@...nel.org>
---
 arch/x86/mm/init.c |   20 +++++++++++---------
 1 files changed, 11 insertions(+), 9 deletions(-)

diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c
index e430f1e..a0f579a 100644
--- a/arch/x86/mm/init.c
+++ b/arch/x86/mm/init.c
@@ -199,10 +199,12 @@ static int __meminit split_mem_range(struct map_range *mr, int nr_range,
 				     unsigned long start,
 				     unsigned long end)
 {
-	unsigned long start_pfn, end_pfn;
+	unsigned long start_pfn, end_pfn, limit_pfn;
 	unsigned long pfn;
 	int i;
 
+	limit_pfn = PFN_DOWN(end);
+
 	/* head if not big page alignment ? */
 	pfn = start_pfn = PFN_DOWN(start);
 #ifdef CONFIG_X86_32
@@ -219,8 +221,8 @@ static int __meminit split_mem_range(struct map_range *mr, int nr_range,
 #else /* CONFIG_X86_64 */
 	end_pfn = round_up(pfn, PFN_DOWN(PMD_SIZE));
 #endif
-	if (end_pfn > PFN_DOWN(end))
-		end_pfn = PFN_DOWN(end);
+	if (end_pfn > limit_pfn)
+		end_pfn = limit_pfn;
 	if (start_pfn < end_pfn) {
 		nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, 0);
 		pfn = end_pfn;
@@ -229,11 +231,11 @@ static int __meminit split_mem_range(struct map_range *mr, int nr_range,
 	/* big page (2M) range */
 	start_pfn = round_up(pfn, PFN_DOWN(PMD_SIZE));
 #ifdef CONFIG_X86_32
-	end_pfn = PFN_DOWN(round_down(end, PMD_SIZE));
+	end_pfn = round_down(limit_pfn, PFN_DOWN(PMD_SIZE));
 #else /* CONFIG_X86_64 */
 	end_pfn = round_up(pfn, PFN_DOWN(PUD_SIZE));
-	if (end_pfn > PFN_DOWN(round_down(end, PMD_SIZE)))
-		end_pfn = PFN_DOWN(round_down(end, PMD_SIZE));
+	if (end_pfn > round_down(limit_pfn, PFN_DOWN(PMD_SIZE)))
+		end_pfn = round_down(limit_pfn, PFN_DOWN(PMD_SIZE));
 #endif
 
 	if (start_pfn < end_pfn) {
@@ -245,7 +247,7 @@ static int __meminit split_mem_range(struct map_range *mr, int nr_range,
 #ifdef CONFIG_X86_64
 	/* big page (1G) range */
 	start_pfn = round_up(pfn, PFN_DOWN(PUD_SIZE));
-	end_pfn = PFN_DOWN(round_down(end, PUD_SIZE));
+	end_pfn = round_down(limit_pfn, PFN_DOWN(PUD_SIZE));
 	if (start_pfn < end_pfn) {
 		nr_range = save_mr(mr, nr_range, start_pfn, end_pfn,
 				page_size_mask &
@@ -255,7 +257,7 @@ static int __meminit split_mem_range(struct map_range *mr, int nr_range,
 
 	/* tail is not big page (1G) alignment */
 	start_pfn = round_up(pfn, PFN_DOWN(PMD_SIZE));
-	end_pfn = PFN_DOWN(round_down(end, PMD_SIZE));
+	end_pfn = round_down(limit_pfn, PFN_DOWN(PMD_SIZE));
 	if (start_pfn < end_pfn) {
 		nr_range = save_mr(mr, nr_range, start_pfn, end_pfn,
 				page_size_mask & (1<<PG_LEVEL_2M));
@@ -265,7 +267,7 @@ static int __meminit split_mem_range(struct map_range *mr, int nr_range,
 
 	/* tail is not big page (2M) alignment */
 	start_pfn = pfn;
-	end_pfn = PFN_DOWN(end);
+	end_pfn = limit_pfn;
 	nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, 0);
 
 	/* try to merge same page size and continuous */
-- 
1.7.7

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