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| author | Oleg Nesterov <oleg@redhat.com> | 2012-07-29 20:22:42 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2012-07-30 11:27:24 +0200 |
| commit | cb113b47d098185f3f1f67e8300d05ddce842b66 (patch) | |
| tree | 86601eb6728a4142e94e4cc3e45697840f6b0768 /kernel | |
| parent | 891c39708144bbe401b4aa151bffd0fe41b1dafd (diff) | |
| download | linux-stable-cb113b47d098185f3f1f67e8300d05ddce842b66.tar.gz linux-stable-cb113b47d098185f3f1f67e8300d05ddce842b66.tar.bz2 linux-stable-cb113b47d098185f3f1f67e8300d05ddce842b66.zip | |
uprobes: Introduce vaddr_to_offset(vma, vaddr)
Add the new helper, vaddr_to_offset(vma, vaddr) which returns
the offset in vma->vm_file this vaddr is mapped at.
Change build_probe_list() and find_active_uprobe() to use the
new helper, the next patch adds another user.
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Srikar Dronamraju <srikar.vnet.ibm.com>
Cc: Anton Arapov <anton@redhat.com>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Link: http://lkml.kernel.org/r/20120729182242.GA20355@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/events/uprobes.c | 14 |
1 files changed, 8 insertions, 6 deletions
diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c index 2ef123306183..b03256cced52 100644 --- a/kernel/events/uprobes.c +++ b/kernel/events/uprobes.c @@ -122,6 +122,11 @@ static loff_t vma_address(struct vm_area_struct *vma, loff_t offset) return vaddr; } +static loff_t vaddr_to_offset(struct vm_area_struct *vma, unsigned long vaddr) +{ + return ((loff_t)vma->vm_pgoff << PAGE_SHIFT) + (vaddr - vma->vm_start); +} + /** * __replace_page - replace page in vma by new page. * based on replace_page in mm/ksm.c @@ -978,7 +983,7 @@ static void build_probe_list(struct inode *inode, struct uprobe *u; INIT_LIST_HEAD(head); - min = ((loff_t)vma->vm_pgoff << PAGE_SHIFT) + start - vma->vm_start; + min = vaddr_to_offset(vma, start); max = min + (end - start) - 1; spin_lock_irqsave(&uprobes_treelock, flags); @@ -1442,12 +1447,9 @@ static struct uprobe *find_active_uprobe(unsigned long bp_vaddr, int *is_swbp) vma = find_vma(mm, bp_vaddr); if (vma && vma->vm_start <= bp_vaddr) { if (valid_vma(vma, false)) { - struct inode *inode; - loff_t offset; + struct inode *inode = vma->vm_file->f_mapping->host; + loff_t offset = vaddr_to_offset(vma, bp_vaddr); - inode = vma->vm_file->f_mapping->host; - offset = bp_vaddr - vma->vm_start; - offset += (loff_t)vma->vm_pgoff << PAGE_SHIFT; uprobe = find_uprobe(inode, offset); } |