path: root/mm/nommu.c
diff options
authorGreg Ungerer <gerg@snapgear.com>2005-09-12 11:18:10 +1000
committerLinus Torvalds <torvalds@g5.osdl.org>2005-09-11 20:43:47 -0700
commit66aa2b4b1cf9a61f1550251c56fc6f0d48287591 (patch)
treeb372d102e0f6a8071c2473c84343f7a1a9d4cf94 /mm/nommu.c
parent966cdb2fdf1776392c98f7d38e0eb9c6dd1c4715 (diff)
[PATCH] uclinux: add NULL check, 0 end valid check and some more exports to nommu.c
Move call to get_mm_counter() in update_mem_hiwater() to be inside the check for tsk->mm being null. Otherwise you can be following a null pointer here. This patch submitted by Javier Herrero <jherrero@hvsistemas.es>. Modify the end check for munmap regions to allow for the legacy behavior of 0 being valid. Pretty much all current uClinux system libc malloc's pass in 0 as the end point. A hard check will fail on these, so change the check so that if it is non-zero it must be valid otherwise it fails. A passed in value will always succeed (as it used too). Also export a few more mm system functions - to be consistent with the VM code exports. Signed-off-by: Greg Ungerer <gerg@uclinux.com> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'mm/nommu.c')
1 files changed, 13 insertions, 4 deletions
diff --git a/mm/nommu.c b/mm/nommu.c
index fd4e8df0f02..064d7044289 100644
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -57,6 +57,11 @@ DECLARE_RWSEM(nommu_vma_sem);
struct vm_operations_struct generic_file_vm_ops = {
* Handle all mappings that got truncated by a "truncate()"
* system call.
@@ -142,6 +147,8 @@ int get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
struct vm_struct *vmlist;
@@ -852,7 +859,7 @@ unsigned long do_mmap_pgoff(struct file *file,
- printk("Allocation of vml for %lu byte allocation from process %d failed\n",
+ printk("Allocation of vma for %lu byte allocation from process %d failed\n",
len, current->pid);
return -ENOMEM;
@@ -909,7 +916,7 @@ int do_munmap(struct mm_struct *mm, unsigned long addr, size_t len)
for (parent = &mm->context.vmlist; *parent; parent = &(*parent)->next)
if ((*parent)->vma->vm_start == addr &&
- (*parent)->vma->vm_end == end)
+ ((len == 0) || ((*parent)->vma->vm_end == end)))
goto found;
printk("munmap of non-mmaped memory by process %d (%s): %p\n",
@@ -1054,7 +1061,8 @@ struct vm_area_struct *find_extend_vma(struct mm_struct *mm, unsigned long addr)
int remap_pfn_range(struct vm_area_struct *vma, unsigned long from,
unsigned long to, unsigned long size, pgprot_t prot)
- return -EPERM;
+ vma->vm_start = vma->vm_pgoff << PAGE_SHIFT;
+ return 0;
void swap_unplug_io_fn(struct backing_dev_info *bdi, struct page *page)
@@ -1073,9 +1081,10 @@ void arch_unmap_area(struct mm_struct *mm, unsigned long addr)
void update_mem_hiwater(struct task_struct *tsk)
- unsigned long rss = get_mm_counter(tsk->mm, rss);
+ unsigned long rss;
if (likely(tsk->mm)) {
+ rss = get_mm_counter(tsk->mm, rss);
if (tsk->mm->hiwater_rss < rss)
tsk->mm->hiwater_rss = rss;
if (tsk->mm->hiwater_vm < tsk->mm->total_vm)