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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2016-03-04 17:43:40 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-03-04 17:43:40 -0800 |
| commit | ed385c7a1752e6a87622e5a2a80808cfb8917305 (patch) | |
| tree | 836d8197351ff0cc1187536d466bd6bbea77bd72 | |
| parent | c51797d25d84833804e9e6950c8c1abbe6c73808 (diff) | |
| parent | dfd55ad85e4a7fbaa82df12467515ac3c81e8a3e (diff) | |
| download | linux-ed385c7a1752e6a87622e5a2a80808cfb8917305.tar.bz2 | |
Merge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux
Pull arm64 fix from Will Deacon:
"Arm64 fix for -rc7. Without it, our struct page array can overflow
the vmemmap region on systems with a large PHYS_OFFSET.
Nothing else on the radar at the moment, so hopefully that's it for
4.5 from us.
Summary: Ensure struct page array fits within vmemmap area"
* tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux:
arm64: vmemmap: use virtual projection of linear region
| -rw-r--r-- | arch/arm64/include/asm/pgtable.h | 7 | ||||
| -rw-r--r-- | arch/arm64/mm/init.c | 4 |
2 files changed, 6 insertions, 5 deletions
diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h index bf464de33f52..f50608674580 100644 --- a/arch/arm64/include/asm/pgtable.h +++ b/arch/arm64/include/asm/pgtable.h @@ -34,13 +34,13 @@ /* * VMALLOC and SPARSEMEM_VMEMMAP ranges. * - * VMEMAP_SIZE: allows the whole VA space to be covered by a struct page array + * VMEMAP_SIZE: allows the whole linear region to be covered by a struct page array * (rounded up to PUD_SIZE). * VMALLOC_START: beginning of the kernel VA space * VMALLOC_END: extends to the available space below vmmemmap, PCI I/O space, * fixed mappings and modules */ -#define VMEMMAP_SIZE ALIGN((1UL << (VA_BITS - PAGE_SHIFT)) * sizeof(struct page), PUD_SIZE) +#define VMEMMAP_SIZE ALIGN((1UL << (VA_BITS - PAGE_SHIFT - 1)) * sizeof(struct page), PUD_SIZE) #ifndef CONFIG_KASAN #define VMALLOC_START (VA_START) @@ -51,7 +51,8 @@ #define VMALLOC_END (PAGE_OFFSET - PUD_SIZE - VMEMMAP_SIZE - SZ_64K) -#define vmemmap ((struct page *)(VMALLOC_END + SZ_64K)) +#define VMEMMAP_START (VMALLOC_END + SZ_64K) +#define vmemmap ((struct page *)VMEMMAP_START - (memstart_addr >> PAGE_SHIFT)) #define FIRST_USER_ADDRESS 0UL diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c index f3b061e67bfe..7802f216a67a 100644 --- a/arch/arm64/mm/init.c +++ b/arch/arm64/mm/init.c @@ -319,8 +319,8 @@ void __init mem_init(void) #endif MLG(VMALLOC_START, VMALLOC_END), #ifdef CONFIG_SPARSEMEM_VMEMMAP - MLG((unsigned long)vmemmap, - (unsigned long)vmemmap + VMEMMAP_SIZE), + MLG(VMEMMAP_START, + VMEMMAP_START + VMEMMAP_SIZE), MLM((unsigned long)virt_to_page(PAGE_OFFSET), (unsigned long)virt_to_page(high_memory)), #endif |