HWPOISON/signalfd: add support for addr_lsb

Similar change as to signal delivery: copy out the si_addr_lsb field
to user space in signalfd

Signed-off-by: Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>
Signed-off-by: Andi Kleen <ak@linux.intel.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/fs/signalfd.c b/fs/signalfd.c
index 1c5a6add779d..bdd4496ae67f 100644
--- a/fs/signalfd.c
+++ b/fs/signalfd.c
@@ -99,6 +99,16 @@ static int signalfd_copyinfo(struct signalfd_siginfo __user *uinfo,
 #ifdef __ARCH_SI_TRAPNO
                 err |= __put_user(kinfo->si_trapno, &uinfo->ssi_trapno);
 #endif
+#ifdef BUS_MCEERR_AO
+                /* 
+                 * Other callers might not initialize the si_lsb field,
+                 * so check explicitly for the right codes here.
+                 */
+                if (kinfo->si_code == BUS_MCEERR_AR ||
+                    kinfo->si_code == BUS_MCEERR_AO)
+                        err |= __put_user((short) kinfo->si_addr_lsb,
+                                          &uinfo->ssi_addr_lsb);
+#endif
                 break;
         case __SI_CHLD:
                 err |= __put_user(kinfo->si_pid, &uinfo->ssi_pid);