mm: fix up some user-visible effects of the stack guard page

[pandora-kernel.git] / fs / proc / task_mmu.c

diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index aea1d3f..439fc1f 100644 (file)
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -210,6 +210,7 @@ static void show_map_vma(struct seq_file *m, struct vm_area_struct *vma)
        int flags = vma->vm_flags;
        unsigned long ino = 0;
        unsigned long long pgoff = 0;
+       unsigned long start;
        dev_t dev = 0;
        int len;
 
@@ -220,8 +221,13 @@ static void show_map_vma(struct seq_file *m, struct vm_area_struct *vma)
                pgoff = ((loff_t)vma->vm_pgoff) << PAGE_SHIFT;
        }
 
+       /* We don't show the stack guard page in /proc/maps */
+       start = vma->vm_start;
+       if (vma->vm_flags & VM_GROWSDOWN)
+               start += PAGE_SIZE;
+
        seq_printf(m, "%08lx-%08lx %c%c%c%c %08llx %02x:%02x %lu %n",
-                       vma->vm_start,
+                       start,
                        vma->vm_end,
                        flags & VM_READ ? 'r' : '-',
                        flags & VM_WRITE ? 'w' : '-',