lkml.org 
[lkml]   [2011]   [Jan]   [26]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [RFC] [PATCH 2.6.37-rc5-tip 14/20] 14: uprobes: Handing int3 and singlestep exception.
From
Date
On Wed, 2011-01-26 at 14:22 +0530, Srikar Dronamraju wrote:
> * Peter Zijlstra <peterz@infradead.org> [2011-01-25 14:56:19]:
>
> > On Thu, 2010-12-16 at 15:29 +0530, Srikar Dronamraju wrote:
> > > + down_read(&mm->mmap_sem);
> > > + for (vma = mm->mmap; vma; vma = vma->vm_next) {
> > > + if (!valid_vma(vma))
> > > + continue;
> > > + if (probept < vma->vm_start || probept > vma->vm_end)
> > > + continue;
> > > + u = find_uprobe(vma->vm_file->f_mapping->host,
> > > + probept - vma->vm_start);
> > > + if (u)
> > > + break;
> > > + }
> > > + up_read(&mm->mmap_sem);
> >
> > One has to ask, what's wrong with find_vma() ?
>
> Are you looking for something like this.
>
> down_read(&mm->mmap_sem);
> for (vma = find_vma(mm, probept); ; vma = vma->vm_next) {
> if (!valid_vma(vma))
> continue;
> u = find_uprobe(vma->vm_file->f_mapping->host,
> probept - vma->vm_start);
> if (u)
> break;
> }
> up_read(&mm->mmap_sem);

How could you ever need to iterate here? There is only a single vma that
covers the probe point, if that doesn't find a uprobe, there isn't any.


\
 
 \ /
  Last update: 2011-01-26 11:19    [W:0.642 / U:0.116 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site