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]
...
Signed-off-by: Xishi Qiu <qiuxi...@huawei.com>
Suggested-by: Andrew Morton <a...@linux-foundation.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
--
2.0.0
--
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