Attachment 27461 Details for Bug 64652

[patch] smp-fault-2.4.diff

smp-fault-2.4.diff (text/plain), 1.18 KB, created by Thomas Biege on 2005-01-08 00:01:08 UTC

(hide)

Description:

Filename:

MIME Type:

Creator: Thomas Biege

Created: 2005-01-08 00:01:08 UTC

Size: 1.18 KB

patch

obsolete

>--- linux-2.4.28.orig/include/linux/mm.h	2005-01-06 13:31:40.730506624 -0200
>+++ linux-2.4.28/include/linux/mm.h	2005-01-06 15:53:51.383650224 -0200
>@@ -647,12 +647,22 @@
> 	unsigned long grow;
> 
> 	/*
>-	 * vma->vm_start/vm_end cannot change under us because the caller is required
>-	 * to hold the mmap_sem in write mode. We need to get the spinlock only
>-	 * before relocating the vma range ourself.
>+	 * vma->vm_start/vm_end cannot change under us because the caller
>+	 * is required to hold the mmap_sem in read mode.  We need the
>+	 * page_table_lock lock to serialize against concurrent expand_stacks.
> 	 */
> 	address &= PAGE_MASK;
>  	spin_lock(&vma->vm_mm->page_table_lock);
>+
>+	/* already expanded while we were spinning? */
>+	if ((vma->vm_flags & VM_GROWSDOWN) && vma->vm_start <= address) {
>+		spin_unlock(vma->vm_mm->page_table_lock);
>+		return 0;
>+	} else if ((vma->vm_flags & VM_GROWSUP) && vma->vm_start >= address) {
>+		spin_unlock(vma->vm_mm->page_table_lock);
>+		return 0;
>+	}
>+
> 	grow = (vma->vm_start - address) >> PAGE_SHIFT;
> 	if (vma->vm_end - address > current->rlim[RLIMIT_STACK].rlim_cur ||
> 	    ((vma->vm_mm->total_vm + grow) << PAGE_SHIFT) > current->rlim[RLIMIT_AS].rlim_cur) {
>

Actions: View | Diff

Attachments on bug 64652: 27460 | 27461 | 27462 | 27606 | 27626 | 27628 | 27647