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authorLennert Buytenhek <buytenh@wantstofly.org>2006-07-10 04:45:27 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-07-10 13:24:25 -0700
commit06c67befeeb16f2995c11b0e04a348103ddbfab1 (patch)
treeaad64fa9d2d03b1479885d1c703ccc5890b12afe /include/asm-ia64/machvec.h
parent49c0dab7e6000888b616bedcbbc8cd4710331610 (diff)
[PATCH] make valid_mmap_phys_addr_range() take a pfn
Newer ARMs have a 40 bit physical address space, but mapping physical memory above 4G needs a special page table format which we (currently?) do not use for userspace mappings, so what happens instead is that mapping an address >= 4G will happily discard the upper bits and wrap. There is a valid_mmap_phys_addr_range() arch hook where we could check for >= 4G addresses and deny the mapping, but this hook takes an unsigned long address: static inline int valid_mmap_phys_addr_range(unsigned long addr, size_t size); And drivers/char/mem.c:mmap_mem() calls it like this: static int mmap_mem(struct file * file, struct vm_area_struct * vma) { size_t size = vma->vm_end - vma->vm_start; if (!valid_mmap_phys_addr_range(vma->vm_pgoff << PAGE_SHIFT, size)) So that's not much help either. This patch makes the hook take a pfn instead of a phys address. Signed-off-by: Lennert Buytenhek <buytenh@wantstofly.org> Cc: Bjorn Helgaas <bjorn.helgaas@hp.com> Cc: "Luck, Tony" <tony.luck@intel.com> Cc: Russell King <rmk@arm.linux.org.uk> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/asm-ia64/machvec.h')
0 files changed, 0 insertions, 0 deletions