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Commit 90f72aa5 authored by Arnd Bergmann's avatar Arnd Bergmann Committed by Linus Torvalds
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mm: add MAP_HUGETLB for mmaping pseudo-anonymous huge page regions 



Add a flag for mmap that will be used to request a huge page region that
will look like anonymous memory to user space.  This is accomplished by
using a file on the internal vfsmount.  MAP_HUGETLB is a modifier of
MAP_ANONYMOUS and so must be specified with it.  The region will behave
the same as a MAP_ANONYMOUS region using small pages.

The patch also adds the MAP_STACK flag, which was previously defined only
on some architectures but not on others.  Since MAP_STACK is meant to be a
hint only, architectures can define it without assigning a specific
meaning to it.

Signed-off-by: default avatarArnd Bergmann <arnd@arndb.de>
Cc: Eric B Munson <ebmunson@us.ibm.com>
Cc: Hugh Dickins <hugh.dickins@tiscali.co.uk>
Cc: David Rientjes <rientjes@google.com>
Cc: <linux-arch@vger.kernel.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 6bfde05b

arch/alpha/include/asm/mman.h

+2 −0
Original line number Diff line number Diff line
@@ -28,6 +28,8 @@ 
#define MAP_NORESERVE	0x10000		/* don't check for reservations */

#define MAP_POPULATE	0x20000		/* populate (prefault) pagetables */

#define MAP_NONBLOCK	0x40000		/* do not block on IO */

#define MAP_STACK	0x80000		/* give out an address that is best suited for process/thread stacks */

#define MAP_HUGETLB	0x100000	/* create a huge page mapping */



#define MS_ASYNC	1		/* sync memory asynchronously */

#define MS_SYNC		2		/* synchronous memory sync */

arch/arm/include/asm/mman.h

+2 −0
Original line number Diff line number Diff line
@@ -10,6 +10,8 @@ 
#define MAP_NORESERVE	0x4000		/* don't check for reservations */

#define MAP_POPULATE	0x8000		/* populate (prefault) page tables */

#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 MCL_CURRENT	1		/* lock all current mappings */

#define MCL_FUTURE	2		/* lock all future mappings */

arch/avr32/include/asm/mman.h

+2 −0
Original line number Diff line number Diff line
@@ -10,6 +10,8 @@ 
#define MAP_NORESERVE	0x4000		/* don't check for reservations */

#define MAP_POPULATE	0x8000		/* populate (prefault) page tables */

#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 MCL_CURRENT	1		/* lock all current mappings */

#define MCL_FUTURE	2		/* lock all future mappings */

arch/cris/include/asm/mman.h

+2 −0
Original line number Diff line number Diff line
@@ -12,6 +12,8 @@ 
#define MAP_NORESERVE	0x4000		/* don't check for reservations */

#define MAP_POPULATE	0x8000		/* populate (prefault) pagetables */

#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 MCL_CURRENT	1		/* lock all current mappings */

#define MCL_FUTURE	2		/* lock all future mappings */

arch/frv/include/asm/mman.h

+2 −0
Original line number Diff line number Diff line
@@ -10,6 +10,8 @@ 
#define MAP_NORESERVE	0x4000		/* don't check for reservations */

#define MAP_POPULATE	0x8000		/* populate (prefault) pagetables */

#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 MCL_CURRENT	1		/* lock all current mappings */

#define MCL_FUTURE	2		/* lock all future mappings */