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

* 'hwpoison' of git://git.kernel.org/pub/scm/linux/kernel/git/ak/linux-mce-2.6: (22 commits)
  Add _addr_lsb field to ia64 siginfo
  Fix migration.c compilation on s390
  HWPOISON: Remove retry loop for try_to_unmap
  HWPOISON: Turn addr_valid from bitfield into char
  HWPOISON: Disable DEBUG by default
  HWPOISON: Convert pr_debugs to pr_info
  HWPOISON: Improve comments in memory-failure.c
  x86: HWPOISON: Report correct address granuality for huge hwpoison faults
  Encode huge page size for VM_FAULT_HWPOISON errors
  Fix build error with !CONFIG_MIGRATION
  hugepage: move is_hugepage_on_freelist inside ifdef to avoid warning
  Clean up __page_set_anon_rmap
  HWPOISON, hugetlb: fix unpoison for hugepage
  HWPOISON, hugetlb: soft offlining for hugepage
  HWPOSION, hugetlb: recover from free hugepage error when !MF_COUNT_INCREASED
  hugetlb: move refcounting in hugepage allocation inside hugetlb_lock
  HWPOISON, hugetlb: add free check to dequeue_hwpoison_huge_page()
  hugetlb: hugepage migration core
  hugetlb: redefine hugepage copy functions
  hugetlb: add allocate function for hugepage migration
  ...

2 files changed, 14 insertions, 6 deletions

diff --git a/arch/ia64/include/asm/siginfo.h b/arch/ia64/include/asm/siginfo.h
index 118d42979003..c8fcaa2ac48f 100644
--- a/arch/ia64/include/asm/siginfo.h
+++ b/arch/ia64/include/asm/siginfo.h
@@ -62,6 +62,7 @@ typedef struct siginfo {
                         int _imm;               /* immediate value for "break" */
                         unsigned int _flags;    /* see below */
                         unsigned long _isr;     /* isr */
+                        short _addr_lsb;        /* lsb of faulting address */
                 } _sigfault;
 
                 /* SIGPOLL */
diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c
index 79b0b372d2d0..852b319edbdc 100644
--- a/arch/x86/mm/fault.c
+++ b/arch/x86/mm/fault.c
@@ -11,6 +11,7 @@
 #include <linux/kprobes.h>              /* __kprobes, ...               */
 #include <linux/mmiotrace.h>            /* kmmio_handler, ...           */
 #include <linux/perf_event.h>           /* perf_sw_event                */
+#include <linux/hugetlb.h>              /* hstate_index_to_shift        */
 
 #include <asm/traps.h>                  /* dotraplinkage, ...           */
 #include <asm/pgalloc.h>                /* pgd_*(), ...                 */
@@ -160,15 +161,20 @@ is_prefetch(struct pt_regs *regs, unsigned long error_code, unsigned long addr)
 
 static void
 force_sig_info_fault(int si_signo, int si_code, unsigned long address,
-                     struct task_struct *tsk)
+                     struct task_struct *tsk, int fault)
 {
+        unsigned lsb = 0;
         siginfo_t info;
 
         info.si_signo   = si_signo;
         info.si_errno   = 0;
         info.si_code    = si_code;
         info.si_addr    = (void __user *)address;
-        info.si_addr_lsb = si_code == BUS_MCEERR_AR ? PAGE_SHIFT : 0;
+        if (fault & VM_FAULT_HWPOISON_LARGE)
+                lsb = hstate_index_to_shift(VM_FAULT_GET_HINDEX(fault)); 
+        if (fault & VM_FAULT_HWPOISON)
+                lsb = PAGE_SHIFT;
+        info.si_addr_lsb = lsb;
 
         force_sig_info(si_signo, &info, tsk);
 }
@@ -722,7 +728,7 @@ __bad_area_nosemaphore(struct pt_regs *regs, unsigned long error_code,
                 tsk->thread.error_code  = error_code | (address >= TASK_SIZE);
                 tsk->thread.trap_no     = 14;
 
-                force_sig_info_fault(SIGSEGV, si_code, address, tsk);
+                force_sig_info_fault(SIGSEGV, si_code, address, tsk, 0);
 
                 return;
         }
@@ -807,14 +813,14 @@ do_sigbus(struct pt_regs *regs, unsigned long error_code, unsigned long address,
         tsk->thread.trap_no     = 14;
 
 #ifdef CONFIG_MEMORY_FAILURE
-        if (fault & VM_FAULT_HWPOISON) {
+        if (fault & (VM_FAULT_HWPOISON|VM_FAULT_HWPOISON_LARGE)) {
                 printk(KERN_ERR
         "MCE: Killing %s:%d due to hardware memory corruption fault at %lx\n",
                         tsk->comm, tsk->pid, address);
                 code = BUS_MCEERR_AR;
         }
 #endif
-        force_sig_info_fault(SIGBUS, code, address, tsk);
+        force_sig_info_fault(SIGBUS, code, address, tsk, fault);
 }
 
 static noinline void
@@ -824,7 +830,8 @@ mm_fault_error(struct pt_regs *regs, unsigned long error_code,
         if (fault & VM_FAULT_OOM) {
                 out_of_memory(regs, error_code, address);
         } else {
-                if (fault & (VM_FAULT_SIGBUS|VM_FAULT_HWPOISON))
+                if (fault & (VM_FAULT_SIGBUS|VM_FAULT_HWPOISON|
+                             VM_FAULT_HWPOISON_LARGE))
                         do_sigbus(regs, error_code, address, fault);
                 else
                         BUG();