A-Team_Digital_Solutions/android_kernel_motorola_sm6375
Watch
2
0
Fork
You've already forked android_kernel_motorola_sm6375
 0
mirror of https://github.com/BobTheBlinker/android_kernel_motorola_sm6375.git synced 2026-10-29 19:21:31 -04:00
Code Issues Projects Releases Packages Wiki Activity

hugetlb: add MAP_HUGETLB for mmaping pseudo-anonymous huge page regions

Browse source 
Add a flag for mmap that will be used to request a huge page region that
will look like anonymous memory to userspace.  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.

[[email protected]: fix arch definitions of MAP_HUGETLB]
Signed-off-by: Eric B Munson <[email protected]>
Acked-by: David Rientjes <[email protected]>
Cc: Mel Gorman <[email protected]>
Cc: Adam Litke <[email protected]>
Cc: David Gibson <[email protected]>
Cc: Lee Schermerhorn <[email protected]>
Cc: Nick Piggin <[email protected]>
Cc: Hugh Dickins <[email protected]>
Cc: Arnd Bergmann <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Eric B Munson 2009-09-21 17:03:47 -07:00 • committed by Linus Torvalds
commit 4e52780d41
2 changed files with 25 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

18
mm/mmap.c
View file

@ -949,6 +949,24 @@ unsigned long do_mmap_pgoff(struct file *file, unsigned long addr,
if (mm->map_count > sysctl_max_map_count)
return -ENOMEM;
if (flags & MAP_HUGETLB) {
struct user_struct *user = NULL;
if (file)
return -EINVAL;
/*
* VM_NORESERVE is used because the reservations will be
* taken when vm_ops->mmap() is called
* A dummy user value is used because we are not locking
* memory so no accounting is necessary
*/
len = ALIGN(len, huge_page_size(&default_hstate));
file = hugetlb_file_setup(HUGETLB_ANON_FILE, len, VM_NORESERVE,
&user, HUGETLB_ANONHUGE_INODE);
if (IS_ERR(file))
return PTR_ERR(file);
}
/* Obtain the address to map to. we verify (or select) it and ensure
* that it represents a valid section of the address space.
*/