linux-kernel - [PATCH v8 41/46] x86, mm: Use clamp_t() in init_range_memory

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Message-Id: <1353123563-3103-42-git-send-email-yinghai@kernel.org>
Date:	Fri, 16 Nov 2012 19:39:18 -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 v8 41/46] x86, mm: Use clamp_t() in init_range_memory_mapping

save some lines, and make code more readable.

Signed-off-by: Yinghai Lu <yinghai@...nel.org>
---
 arch/x86/mm/init.c |   21 +++++----------------
 1 files changed, 5 insertions(+), 16 deletions(-)

diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c
index 2a27e5a..6f85de8 100644
--- a/arch/x86/mm/init.c
+++ b/arch/x86/mm/init.c
@@ -357,31 +357,20 @@ unsigned long __init_refok init_memory_mapping(unsigned long start,
  * would have hole in the middle or ends, and only ram parts will be mapped.
  */
 static unsigned long __init init_range_memory_mapping(
-					   unsigned long range_start,
-					   unsigned long range_end)
+					   unsigned long r_start,
+					   unsigned long r_end)
 {
 	unsigned long start_pfn, end_pfn;
 	unsigned long mapped_ram_size = 0;
 	int i;
 
 	for_each_mem_pfn_range(i, MAX_NUMNODES, &start_pfn, &end_pfn, NULL) {
-		u64 start = (u64)start_pfn << PAGE_SHIFT;
-		u64 end = (u64)end_pfn << PAGE_SHIFT;
-
-		if (end <= range_start)
-			continue;
-
-		if (start < range_start)
-			start = range_start;
-
-		if (start >= range_end)
+		u64 start = clamp_val(PFN_PHYS(start_pfn), r_start, r_end);
+		u64 end = clamp_val(PFN_PHYS(end_pfn), r_start, r_end);
+		if (start >= end)
 			continue;
 
-		if (end > range_end)
-			end = range_end;
-
 		init_memory_mapping(start, end);
-
 		mapped_ram_size += end - start;
 	}
 
-- 
1.7.7

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