Messages in this thread Patch in this message | | | From | Christoph Hellwig <> | Subject | [PATCH 2/3] x86: add a is_e820_ram() helper | Date | Wed, 25 Mar 2015 17:04:08 +0100 |
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This will allow to deal with persistent memory which needs to be treated like ram in many, but not all cases.
Based on an earlier patch from Dave Jiang <dave.jiang@intel.com>.
Signed-off-by: Christoph Hellwig <hch@lst.de> --- arch/x86/kernel/e820.c | 15 ++++++++++----- 1 file changed, 10 insertions(+), 5 deletions(-)
diff --git a/arch/x86/kernel/e820.c b/arch/x86/kernel/e820.c index 46201de..de088e3 100644 --- a/arch/x86/kernel/e820.c +++ b/arch/x86/kernel/e820.c @@ -48,6 +48,11 @@ unsigned long pci_mem_start = 0xaeedbabe; EXPORT_SYMBOL(pci_mem_start); #endif +static inline bool is_e820_ram(__u32 type) +{ + return type == E820_RAM; +} + /* * This function checks if any part of the range <start,end> is mapped * with type. @@ -688,7 +693,7 @@ void __init e820_mark_nosave_regions(unsigned long limit_pfn) register_nosave_region(pfn, PFN_UP(ei->addr)); pfn = PFN_DOWN(ei->addr + ei->size); - if (ei->type != E820_RAM && ei->type != E820_RESERVED_KERN) + if (!is_e820_ram(ei->type) && ei->type != E820_RESERVED_KERN) register_nosave_region(PFN_UP(ei->addr), pfn); if (pfn >= limit_pfn) @@ -748,7 +753,7 @@ u64 __init early_reserve_e820(u64 size, u64 align) /* * Find the highest page frame number we have available */ -static unsigned long __init e820_end_pfn(unsigned long limit_pfn, unsigned type) +static unsigned long __init e820_end_pfn(unsigned long limit_pfn) { int i; unsigned long last_pfn = 0; @@ -759,7 +764,7 @@ static unsigned long __init e820_end_pfn(unsigned long limit_pfn, unsigned type) unsigned long start_pfn; unsigned long end_pfn; - if (ei->type != type) + if (!is_e820_ram(ei->type)) continue; start_pfn = ei->addr >> PAGE_SHIFT; @@ -784,12 +789,12 @@ static unsigned long __init e820_end_pfn(unsigned long limit_pfn, unsigned type) } unsigned long __init e820_end_of_ram_pfn(void) { - return e820_end_pfn(MAX_ARCH_PFN, E820_RAM); + return e820_end_pfn(MAX_ARCH_PFN); } unsigned long __init e820_end_of_low_ram_pfn(void) { - return e820_end_pfn(1UL<<(32 - PAGE_SHIFT), E820_RAM); + return e820_end_pfn(1UL<<(32 - PAGE_SHIFT)); } static void early_panic(char *msg) -- 1.9.1
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