Merge branch 'hwpoison-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/ak/linux-mce-2.6

* 'hwpoison-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/ak/linux-mce-2.6:
  HWPOISON: Stop shrinking at right page count
  HWPOISON: Report correct address granuality for AO huge page errors
  HWPOISON: Copy si_addr_lsb to user
  page-types.c: fix name of unpoison interface

3 files changed, 15 insertions, 7 deletions

diff --git a/Documentation/vm/page-types.c b/Documentation/vm/page-types.c
index ccd951fa94ee..cc96ee2666f2 100644
--- a/Documentation/vm/page-types.c
+++ b/Documentation/vm/page-types.c
@@ -478,7 +478,7 @@ static void prepare_hwpoison_fd(void)
         }
 
         if (opt_unpoison && !hwpoison_forget_fd) {
-                sprintf(buf, "%s/renew-pfn", hwpoison_debug_fs);
+                sprintf(buf, "%s/unpoison-pfn", hwpoison_debug_fs);
                 hwpoison_forget_fd = checked_open(buf, O_WRONLY);
         }
 }
diff --git a/kernel/signal.c b/kernel/signal.c
index bded65187780..919562c3d6b7 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -2215,6 +2215,14 @@ int copy_siginfo_to_user(siginfo_t __user *to, siginfo_t *from)
 #ifdef __ARCH_SI_TRAPNO
                 err |= __put_user(from->si_trapno, &to->si_trapno);
 #endif
+#ifdef BUS_MCEERR_AO
+                /* 
+                 * Other callers might not initialize the si_lsb field,
+                 * so check explicitely for the right codes here.
+                 */
+                if (from->si_code == BUS_MCEERR_AR || from->si_code == BUS_MCEERR_AO)
+                        err |= __put_user(from->si_addr_lsb, &to->si_addr_lsb);
+#endif
                 break;
         case __SI_CHLD:
                 err |= __put_user(from->si_pid, &to->si_pid);
diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index 9c26eeca1342..757f6b0accfe 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -183,7 +183,7 @@ EXPORT_SYMBOL_GPL(hwpoison_filter);
  * signal.
  */
 static int kill_proc_ao(struct task_struct *t, unsigned long addr, int trapno,
-                        unsigned long pfn)
+                        unsigned long pfn, struct page *page)
 {
         struct siginfo si;
         int ret;
@@ -198,7 +198,7 @@ static int kill_proc_ao(struct task_struct *t, unsigned long addr, int trapno,
 #ifdef __ARCH_SI_TRAPNO
         si.si_trapno = trapno;
 #endif
-        si.si_addr_lsb = PAGE_SHIFT;
+        si.si_addr_lsb = compound_order(compound_head(page)) + PAGE_SHIFT;
         /*
          * Don't use force here, it's convenient if the signal
          * can be temporarily blocked.
@@ -235,7 +235,7 @@ void shake_page(struct page *p, int access)
                 int nr;
                 do {
                         nr = shrink_slab(1000, GFP_KERNEL, 1000);
-                        if (page_count(p) == 0)
+                        if (page_count(p) == 1)
                                 break;
                 } while (nr > 10);
         }
@@ -327,7 +327,7 @@ static void add_to_kill(struct task_struct *tsk, struct page *p,
  * wrong earlier.
  */
 static void kill_procs_ao(struct list_head *to_kill, int doit, int trapno,
-                          int fail, unsigned long pfn)
+                          int fail, struct page *page, unsigned long pfn)
 {
         struct to_kill *tk, *next;
 
@@ -352,7 +352,7 @@ static void kill_procs_ao(struct list_head *to_kill, int doit, int trapno,
                          * process anyways.
                          */
                         else if (kill_proc_ao(tk->tsk, tk->addr, trapno,
-                                              pfn) < 0)
+                                              pfn, page) < 0)
                                 printk(KERN_ERR
                 "MCE %#lx: Cannot send advisory machine check signal to %s:%d\n",
                                         pfn, tk->tsk->comm, tk->tsk->pid);
@@ -928,7 +928,7 @@ static int hwpoison_user_mappings(struct page *p, unsigned long pfn,
          * any accesses to the poisoned memory.
          */
         kill_procs_ao(&tokill, !!PageDirty(hpage), trapno,
-                      ret != SWAP_SUCCESS, pfn);
+                      ret != SWAP_SUCCESS, p, pfn);
 
         return ret;
 }