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| author | HATAYAMA Daisuke <d.hatayama@jp.fujitsu.com> | 2013-07-04 02:02:18 +0400 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-07-04 03:07:30 +0400 |
| commit | e69e9d4aee712a22665f008ae0550bb3d7c7f7c1 (patch) | |
| tree | bb63cd5b881678c902f6b5e197a107022825be30 /include | |
| parent | cef2ac3f6c8ab532e49cf69d05f540931ad8ee64 (diff) | |
| download | linux-e69e9d4aee712a22665f008ae0550bb3d7c7f7c1.tar.xz | |
vmalloc: introduce remap_vmalloc_range_partial
We want to allocate ELF note segment buffer on the 2nd kernel in vmalloc
space and remap it to user-space in order to reduce the risk that memory
allocation fails on system with huge number of CPUs and so with huge ELF
note segment that exceeds 11-order block size.
Although there's already remap_vmalloc_range for the purpose of
remapping vmalloc memory to user-space, we need to specify user-space
range via vma.
Mmap on /proc/vmcore needs to remap range across multiple objects, so
the interface that requires vma to cover full range is problematic.
This patch introduces remap_vmalloc_range_partial that receives user-space
range as a pair of base address and size and can be used for mmap on
/proc/vmcore case.
remap_vmalloc_range is rewritten using remap_vmalloc_range_partial.
[akpm@linux-foundation.org: use PAGE_ALIGNED()]
Signed-off-by: HATAYAMA Daisuke <d.hatayama@jp.fujitsu.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Vivek Goyal <vgoyal@redhat.com>
Cc: Atsushi Kumagai <kumagai-atsushi@mxc.nes.nec.co.jp>
Cc: Lisa Mitchell <lisa.mitchell@hp.com>
Cc: Zhang Yanfei <zhangyanfei@cn.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/vmalloc.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/vmalloc.h b/include/linux/vmalloc.h index 7d5773a99f20..dd0a2c810529 100644 --- a/include/linux/vmalloc.h +++ b/include/linux/vmalloc.h @@ -82,6 +82,10 @@ extern void *vmap(struct page **pages, unsigned int count, unsigned long flags, pgprot_t prot); extern void vunmap(const void *addr); +extern int remap_vmalloc_range_partial(struct vm_area_struct *vma, + unsigned long uaddr, void *kaddr, + unsigned long size); + extern int remap_vmalloc_range(struct vm_area_struct *vma, void *addr, unsigned long pgoff); void vmalloc_sync_all(void); |