linux-kernel - [tip:x86/urgent] x86/mm: Fix zone ranges boot printout

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Message-ID: <tip-c072b90c8dfe135072f646cc50b826e30c5aa558@git.kernel.org>
Date:	Thu, 11 Dec 2014 04:26:10 -0800
From:	tip-bot for Xishi Qiu <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	akpm@...ux-foundation.org, tglx@...utronix.de, qiuxishi@...wei.com,
	riel@...hat.com, dave@...1.net, mingo@...nel.org, hpa@...or.com,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: [tip:x86/urgent] x86/mm: Fix zone ranges boot printout

Commit-ID:  c072b90c8dfe135072f646cc50b826e30c5aa558
Gitweb:     http://git.kernel.org/tip/c072b90c8dfe135072f646cc50b826e30c5aa558
Author:     Xishi Qiu <qiuxishi@...wei.com>
AuthorDate: Wed, 10 Dec 2014 10:09:01 +0800
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Thu, 11 Dec 2014 11:35:02 +0100

x86/mm: Fix zone ranges boot printout

This is the usual physical memory layout boot printout:
	...
	[    0.000000] Zone ranges:
	[    0.000000]   DMA      [mem 0x00001000-0x00ffffff]
	[    0.000000]   DMA32    [mem 0x01000000-0xffffffff]
	[    0.000000]   Normal   [mem 0x100000000-0xc3fffffff]
	[    0.000000] Movable zone start for each node
	[    0.000000] Early memory node ranges
	[    0.000000]   node   0: [mem 0x00001000-0x00099fff]
	[    0.000000]   node   0: [mem 0x00100000-0xbf78ffff]
	[    0.000000]   node   0: [mem 0x100000000-0x63fffffff]
	[    0.000000]   node   1: [mem 0x640000000-0xc3fffffff]
	...

This is the log when we set "mem=2G" on the boot cmdline:
	...
	[    0.000000] Zone ranges:
	[    0.000000]   DMA      [mem 0x00001000-0x00ffffff]
	[    0.000000]   DMA32    [mem 0x01000000-0xffffffff]  // should be 0x7fffffff, right?
	[    0.000000]   Normal   empty
	[    0.000000] Movable zone start for each node
	[    0.000000] Early memory node ranges
	[    0.000000]   node   0: [mem 0x00001000-0x00099fff]
	[    0.000000]   node   0: [mem 0x00100000-0x7fffffff]
	...

This patch fixes the printout, the following log shows the right
ranges:
	...
	[    0.000000] Zone ranges:
	[    0.000000]   DMA      [mem 0x00001000-0x00ffffff]
	[    0.000000]   DMA32    [mem 0x01000000-0x7fffffff]
	[    0.000000]   Normal   empty
	[    0.000000] Movable zone start for each node
	[    0.000000] Early memory node ranges
	[    0.000000]   node   0: [mem 0x00001000-0x00099fff]
	[    0.000000]   node   0: [mem 0x00100000-0x7fffffff]
	...

Suggested-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Xishi Qiu <qiuxishi@...wei.com>
Cc: Linux MM <linux-mm@...ck.org>
Cc: <dave@...1.net>
Cc: Rik van Riel <riel@...hat.com>
Link: http://lkml.kernel.org/r/5487AB3D.6070306@huawei.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/include/asm/dma.h | 2 +-
 arch/x86/mm/init.c         | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/x86/include/asm/dma.h b/arch/x86/include/asm/dma.h
index 0bdb0c5..fe884e1 100644
--- a/arch/x86/include/asm/dma.h
+++ b/arch/x86/include/asm/dma.h
@@ -70,7 +70,7 @@
 #define MAX_DMA_CHANNELS	8
 
 /* 16MB ISA DMA zone */
-#define MAX_DMA_PFN   ((16 * 1024 * 1024) >> PAGE_SHIFT)
+#define MAX_DMA_PFN   ((16UL * 1024 * 1024) >> PAGE_SHIFT)
 
 /* 4GB broken PCI/AGP hardware bus master zone */
 #define MAX_DMA32_PFN ((4UL * 1024 * 1024 * 1024) >> PAGE_SHIFT)
diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c
index 66dba36..07244aa 100644
--- a/arch/x86/mm/init.c
+++ b/arch/x86/mm/init.c
@@ -674,10 +674,10 @@ void __init zone_sizes_init(void)
 	memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
 
 #ifdef CONFIG_ZONE_DMA
-	max_zone_pfns[ZONE_DMA]		= MAX_DMA_PFN;
+	max_zone_pfns[ZONE_DMA]		= min(MAX_DMA_PFN, max_low_pfn);
 #endif
 #ifdef CONFIG_ZONE_DMA32
-	max_zone_pfns[ZONE_DMA32]	= MAX_DMA32_PFN;
+	max_zone_pfns[ZONE_DMA32]	= min(MAX_DMA32_PFN, max_low_pfn);
 #endif
 	max_zone_pfns[ZONE_NORMAL]	= max_low_pfn;
 #ifdef CONFIG_HIGHMEM
--
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