If you recall, I commented on the format of the upstream backported fixes and the commit header format .. this one appears to have the same issues as before.
Bruce On 2014-04-11, 5:13 PM, Charlie Paul wrote:
From: Jonas Svennebring <jonas.svennebr...@lsi.com> ARM: 7840/1: LPAE: don't reject mapping /dev/mem above 4GB commit 3159f372354e8e1f5dee714663d70 upstream With LPAE enabled, physical address space is larger than 4GB. Allow mapping any part of it via /dev/mem by using PHYS_MASK to determine valid range. PHYS_MASK covers 40 bits with LPAE enabled and 32 bits otherwise. Reported-by: Vassili Karpov <av1...@comtv.ru> Signed-off-by: Sergey Dyasly <dse...@gmail.com> Acked-by: Catalin Marinas <catalin.mari...@arm.com> Signed-off-by: Russell King <rmk+ker...@arm.linux.org.uk> Signed-off-by: Jonas Svennebring <jonas.svennebr...@lsi.com> --- arch/arm/mm/mmap.c | 10 ++++------ 1 file changed, 4 insertions(+), 6 deletions(-) diff --git a/arch/arm/mm/mmap.c b/arch/arm/mm/mmap.c index f0ef2f7..18d6aeb 100644 --- a/arch/arm/mm/mmap.c +++ b/arch/arm/mm/mmap.c @@ -11,7 +11,7 @@ #include <linux/random.h> #include <asm/cachetype.h> -#define COLOUR_ALIGN(addr,pgoff) \ +#define COLOUR_ALIGN(addr, pgoff) \ ((((addr)+SHMLBA-1)&~(SHMLBA-1)) + \ (((pgoff)<<PAGE_SHIFT) & (SHMLBA-1))) @@ -146,7 +146,7 @@ arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0, info.flags = VM_UNMAPPED_AREA_TOPDOWN; info.length = len; - info.low_limit = FIRST_USER_ADDRESS; + info.low_limit = PAGE_SIZE; info.high_limit = mm->mmap_base; info.align_mask = do_align ? (PAGE_MASK & (SHMLBA - 1)) : 0; info.align_offset = pgoff << PAGE_SHIFT; @@ -204,13 +204,11 @@ int valid_phys_addr_range(phys_addr_t addr, size_t size) } /* - * We don't use supersection mappings for mmap() on /dev/mem, which - * means that we can't map the memory area above the 4G barrier into - * userspace. + * Do not allow /dev/mem mappings beyond the supported physical range. */ int valid_mmap_phys_addr_range(unsigned long pfn, size_t size) { - return !(pfn + (size >> PAGE_SHIFT) > 0x00100000); + return (pfn + (size >> PAGE_SHIFT)) <= (1 + (PHYS_MASK >> PAGE_SHIFT)); } #ifdef CONFIG_STRICT_DEVMEM
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