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Subject[PATCH V2] x86/mm: Fix zone ranges boot printout
Changelog:
V2:
-fix building warnings of min(...).

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 <qiuxishi@huawei.com>
---
arch/x86/mm/init.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c
index 66dba36..963945d 100644
--- a/arch/x86/mm/init.c
+++ b/arch/x86/mm/init.c
@@ -674,10 +674,12 @@ 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_t(unsigned long,
+ max_low_pfn, MAX_DMA_PFN);
#endif
#ifdef CONFIG_ZONE_DMA32
- max_zone_pfns[ZONE_DMA32] = MAX_DMA32_PFN;
+ max_zone_pfns[ZONE_DMA32] = min_t(unsigned long,
+ max_low_pfn, MAX_DMA32_PFN);
#endif
max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
#ifdef CONFIG_HIGHMEM
--
2.0.0



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