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authorHugh Dickins <hugh@veritas.com>2005-10-29 18:16:20 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2005-10-29 21:40:39 -0700
commit46dea3d092d23a58b42499cc8a21de0fad079f4a (patch)
tree6ca46fb09d18e8ea51a354a1494cc742fcf2f2e7 /arch
parentf449952bc8bde7fbc73c6d20dff92b627a21f8b9 (diff)
downloadop-kernel-dev-46dea3d092d23a58b42499cc8a21de0fad079f4a.zip
op-kernel-dev-46dea3d092d23a58b42499cc8a21de0fad079f4a.tar.gz
[PATCH] mm: ia64 use expand_upwards
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>
Diffstat (limited to 'arch')
-rw-r--r--arch/ia64/mm/fault.c34
-rw-r--r--arch/ia64/mm/init.c2
2 files changed, 8 insertions, 28 deletions
diff --git a/arch/ia64/mm/fault.c b/arch/ia64/mm/fault.c
index f21b555..af7eb08 100644
--- a/arch/ia64/mm/fault.c
+++ b/arch/ia64/mm/fault.c
@@ -20,32 +20,6 @@
extern void die (char *, struct pt_regs *, long);
/*
- * This routine is analogous to expand_stack() but instead grows the
- * register backing store (which grows towards higher addresses).
- * Since the register backing store is access sequentially, we
- * disallow growing the RBS by more than a page at a time. Note that
- * the VM_GROWSUP flag can be set on any VM area but that's fine
- * because the total process size is still limited by RLIMIT_STACK and
- * RLIMIT_AS.
- */
-static inline long
-expand_backing_store (struct vm_area_struct *vma, unsigned long address)
-{
- unsigned long grow;
-
- grow = PAGE_SIZE >> PAGE_SHIFT;
- if (address - vma->vm_start > current->signal->rlim[RLIMIT_STACK].rlim_cur
- || (((vma->vm_mm->total_vm + grow) << PAGE_SHIFT) > current->signal->rlim[RLIMIT_AS].rlim_cur))
- return -ENOMEM;
- vma->vm_end += PAGE_SIZE;
- vma->vm_mm->total_vm += grow;
- if (vma->vm_flags & VM_LOCKED)
- vma->vm_mm->locked_vm += grow;
- vm_stat_account(vma->vm_mm, vma->vm_flags, vma->vm_file, grow);
- return 0;
-}
-
-/*
* Return TRUE if ADDRESS points at a page in the kernel's mapped segment
* (inside region 5, on ia64) and that page is present.
*/
@@ -185,7 +159,13 @@ ia64_do_page_fault (unsigned long address, unsigned long isr, struct pt_regs *re
if (REGION_NUMBER(address) != REGION_NUMBER(vma->vm_start)
|| REGION_OFFSET(address) >= RGN_MAP_LIMIT)
goto bad_area;
- if (expand_backing_store(vma, address))
+ /*
+ * Since the register backing store is accessed sequentially,
+ * we disallow growing it by more than a page at a time.
+ */
+ if (address > vma->vm_end + PAGE_SIZE - sizeof(long))
+ goto bad_area;
+ if (expand_upwards(vma, address))
goto bad_area;
}
goto good_area;
diff --git a/arch/ia64/mm/init.c b/arch/ia64/mm/init.c
index 98246ac..0063b2c 100644
--- a/arch/ia64/mm/init.c
+++ b/arch/ia64/mm/init.c
@@ -158,7 +158,7 @@ ia64_init_addr_space (void)
vma->vm_start = current->thread.rbs_bot & PAGE_MASK;
vma->vm_end = vma->vm_start + PAGE_SIZE;
vma->vm_page_prot = protection_map[VM_DATA_DEFAULT_FLAGS & 0x7];
- vma->vm_flags = VM_DATA_DEFAULT_FLAGS | VM_GROWSUP;
+ vma->vm_flags = VM_DATA_DEFAULT_FLAGS|VM_GROWSUP|VM_ACCOUNT;
down_write(&current->mm->mmap_sem);
if (insert_vm_struct(current->mm, vma)) {
up_write(&current->mm->mmap_sem);
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