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Ingo Molnar 23be8c7ddf x86: fix boot crash on HIGHMEM4G && SPARSEMEM ... Denys Fedoryshchenko reported a bootup crash when he upgraded his system from 3GB to 4GB RAM: http://lkml.org/lkml/2008/1/7/9 the bug is due to HIGHMEM4G && SPARSEMEM kernels making pfn_to_page() to return an invalid pointer when the pfn is in a memory hole. The 256 MB PCI aperture at the end of RAM was not mapped by sparsemem, and hence the pfn was not valid. But set_highmem_pages_init() iterated this range without checking the pfn's validity first. this bug was probably present in the sparsemem code ever since sparsemem has been introduced in v2.6.13. It was masked due to HIGHMEM64G using larger memory regions in sparsemem_32.h: #ifdef CONFIG_X86_PAE #define SECTION_SIZE_BITS 30 #define MAX_PHYSADDR_BITS 36 #define MAX_PHYSMEM_BITS 36 #else #define SECTION_SIZE_BITS 26 #define MAX_PHYSADDR_BITS 32 #define MAX_PHYSMEM_BITS 32 #endif which creates 1GB sparsemem regions instead of 64MB sparsemem regions. So in practice we only ever created true sparsemem holes on x86 with HIGHMEM4G - but that was rarely used by distros. ( btw., we could probably save 2MB of mem_map[]s on X86_PAE if we reduced the sparsemem region size to 256 MB. ) Signed-off-by: Ingo Molnar <mingo@elte.hu> Acked-by: Thomas Gleixner <tglx@linutronix.de>		17 years ago
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Makefile	…
Makefile_32	…
Makefile_64	…
boot_ioremap_32.c	spelling fixes: arch/i386/	18 years ago
discontig_32.c	x86: mm/discontig_32.c: make code static	17 years ago
extable_32.c	…
extable_64.c	…
fault_32.c	Merge branch 'v2.6.24-rc1-lockdep' of git://git.kernel.org/pub/scm/linux/kernel/git/peterz/linux-2.6-lockdep	17 years ago
fault_64.c	lockdep: fixup irq tracing	18 years ago
highmem_32.c	…
hugetlbpage.c	…
init_32.c	x86: fix boot crash on HIGHMEM4G && SPARSEMEM	17 years ago
init_64.c	memory hotplug x86_64: fix section mismatch in init_memory_mapping()	17 years ago
ioremap_32.c	…
ioremap_64.c	…
k8topology_64.c	…
mmap_32.c	…
mmap_64.c	…
numa_64.c	x86: convert cpu_to_apicid to be a per cpu variable	18 years ago
pageattr_32.c	x86: Create clflush() inline, remove hardcoded wbinvd	18 years ago
pageattr_64.c	Intel IOMMU: clflush_cache_range now takes size param	18 years ago
pgtable_32.c	x86: stop nmi softlockup warnings in show_mem()	18 years ago
srat_64.c	spelling fixes: arch/x86_64/	18 years ago