diff options
author | Michel Lespinasse <walken@google.com> | 2013-02-28 05:02:40 +0400 |
---|---|---|
committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-02-28 07:10:09 +0400 |
commit | a003119771f337abeb4a5d7564ac2d22c193fb8b (patch) | |
tree | 7c3eadd04e82f7fb97f643656587f2221c1225eb /arch/parisc | |
parent | f7a3c997af148b13a6225898c9bde1cb858924ba (diff) | |
download | linux-a003119771f337abeb4a5d7564ac2d22c193fb8b.tar.xz |
mm: use vm_unmapped_area() on parisc architecture
Update the parisc arch_get_unmapped_area function to make use of
vm_unmapped_area() instead of implementing a brute force search.
[akpm@linux-foundation.org: remove now-unused DCACHE_ALIGN(), per James]
Signed-off-by: Michel Lespinasse <walken@google.com>
Acked-by: Rik van Riel <riel@redhat.com>
Cc: "James E.J. Bottomley" <jejb@parisc-linux.org>
Acked-by: Helge Deller <deller@gmx.de>
Tested-by: Helge Deller <deller@gmx.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/parisc')
-rw-r--r-- | arch/parisc/kernel/sys_parisc.c | 48 |
1 files changed, 17 insertions, 31 deletions
diff --git a/arch/parisc/kernel/sys_parisc.c b/arch/parisc/kernel/sys_parisc.c index 54d619d4cac6..5dfd248e3f1a 100644 --- a/arch/parisc/kernel/sys_parisc.c +++ b/arch/parisc/kernel/sys_parisc.c @@ -35,22 +35,17 @@ static unsigned long get_unshared_area(unsigned long addr, unsigned long len) { - struct vm_area_struct *vma; + struct vm_unmapped_area_info info; - addr = PAGE_ALIGN(addr); - - for (vma = find_vma(current->mm, addr); ; vma = vma->vm_next) { - /* At this point: (!vma || addr < vma->vm_end). */ - if (TASK_SIZE - len < addr) - return -ENOMEM; - if (!vma || addr + len <= vma->vm_start) - return addr; - addr = vma->vm_end; - } + info.flags = 0; + info.length = len; + info.low_limit = PAGE_ALIGN(addr); + info.high_limit = TASK_SIZE; + info.align_mask = 0; + info.align_offset = 0; + return vm_unmapped_area(&info); } -#define DCACHE_ALIGN(addr) (((addr) + (SHMLBA - 1)) &~ (SHMLBA - 1)) - /* * We need to know the offset to use. Old scheme was to look for * existing mapping and use the same offset. New scheme is to use the @@ -63,30 +58,21 @@ static unsigned long get_unshared_area(unsigned long addr, unsigned long len) */ static int get_offset(struct address_space *mapping) { - int offset = (unsigned long) mapping << (PAGE_SHIFT - 8); - return offset & 0x3FF000; + return (unsigned long) mapping >> 8; } static unsigned long get_shared_area(struct address_space *mapping, unsigned long addr, unsigned long len, unsigned long pgoff) { - struct vm_area_struct *vma; - int offset = mapping ? get_offset(mapping) : 0; + struct vm_unmapped_area_info info; - offset = (offset + (pgoff << PAGE_SHIFT)) & 0x3FF000; - - addr = DCACHE_ALIGN(addr - offset) + offset; - - for (vma = find_vma(current->mm, addr); ; vma = vma->vm_next) { - /* At this point: (!vma || addr < vma->vm_end). */ - if (TASK_SIZE - len < addr) - return -ENOMEM; - if (!vma || addr + len <= vma->vm_start) - return addr; - addr = DCACHE_ALIGN(vma->vm_end - offset) + offset; - if (addr < vma->vm_end) /* handle wraparound */ - return -ENOMEM; - } + info.flags = 0; + info.length = len; + info.low_limit = PAGE_ALIGN(addr); + info.high_limit = TASK_SIZE; + info.align_mask = PAGE_MASK & (SHMLBA - 1); + info.align_offset = (get_offset(mapping) + pgoff) << PAGE_SHIFT; + return vm_unmapped_area(&info); } unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, |