lkml.org 
[lkml]   [2009]   [Oct]   [6]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: [PATCH v2][RFC] add MAP_UNLOCKED mmap flag
    On Tue, Oct 06, 2009 at 07:02:18PM +0200, Gleb Natapov wrote:
    > diff --git a/include/asm-generic/mman.h b/include/asm-generic/mman.h
    > index 32c8bd6..59e0f29 100644
    > --- a/include/asm-generic/mman.h
    > +++ b/include/asm-generic/mman.h
    > @@ -12,6 +12,7 @@
    > #define MAP_NONBLOCK 0x10000 /* do not block on IO */
    > #define MAP_STACK 0x20000 /* give out an address that is best suited for process/thread stacks */
    > #define MAP_HUGETLB 0x40000 /* create a huge page mapping */
    > +#define MAP_UNLOCKED 0x80000 /* force page unlocking */
    >
    > #define MCL_CURRENT 1 /* lock all current mappings */
    > #define MCL_FUTURE 2 /* lock all future mappings */
    > diff --git a/mm/mmap.c b/mm/mmap.c
    > index 73f5e4b..7c2abdb 100644
    > --- a/mm/mmap.c
    > +++ b/mm/mmap.c
    > @@ -985,6 +985,9 @@ unsigned long do_mmap_pgoff(struct file *file, unsigned long addr,
    > if (!can_do_mlock())
    > return -EPERM;
    >
    > + if (flags & MAP_UNLOKED)
    > + vm_flags &= ~VM_LOCKED;

    That needs changing into MAP_UNLOCKED as well.

    Should we do something special about (MAP_UNLOCKED | MAP_LOCKED)?


    \
     
     \ /
      Last update: 2009-10-06 20:45    [W:0.052 / U:31.884 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site