lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

[PATCH] mm: ia64 use expand_upwards

Browse Source 
ia64 has expand_backing_store function for growing its Register Backing Store
vma upwards.  But more complete code for this purpose is found in the
CONFIG_STACK_GROWSUP part of mm/mmap.c.  Uglify its #ifdefs further to provide
expand_upwards for ia64 as well as expand_stack for parisc.

The Register Backing Store vma should be marked VM_ACCOUNT.  Implement the
intention of growing it only a page at a time, instead of passing an address
outside of the vma to handle_mm_fault, with unknown consequences.

Signed-off-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Hugh Dickins
2005-10-29 18:16:20 -07:00
committed by Linus Torvalds
parent f449952bc8
commit 46dea3d092
4 changed files with 24 additions and 32 deletions
Download Patch File Download Diff File Expand all files Collapse all files

17
mm/mmap.c
View File

@ -1508,11 +1508,15 @@ static int acct_stack_growth(struct vm_area_struct * vma, unsigned long size, un
return 0;
}
#ifdef CONFIG_STACK_GROWSUP
#if defined(CONFIG_STACK_GROWSUP) || defined(CONFIG_IA64)
/*
* vma is the first one with address > vma->vm_end. Have to extend vma.
* PA-RISC uses this for its stack; IA64 for its Register Backing Store.
* vma is the last one with address > vma->vm_end. Have to extend vma.
*/
int expand_stack(struct vm_area_struct * vma, unsigned long address)
#ifdef CONFIG_STACK_GROWSUP
static inline
#endif
int expand_upwards(struct vm_area_struct *vma, unsigned long address)
{
int error;
@ -1550,6 +1554,13 @@ int expand_stack(struct vm_area_struct * vma, unsigned long address)
anon_vma_unlock(vma);
return error;
}
#endif /* CONFIG_STACK_GROWSUP || CONFIG_IA64 */
#ifdef CONFIG_STACK_GROWSUP
int expand_stack(struct vm_area_struct *vma, unsigned long address)
{
return expand_upwards(vma, address);
}
struct vm_area_struct *
find_extend_vma(struct mm_struct *mm, unsigned long addr)