5 files changed, 15 insertions, 10 deletions

diff --git a/include/asm-generic/tlb.h b/include/asm-generic/tlb.h
index ed6642ad03e0..25f01d0bc149 100644
--- a/include/asm-generic/tlb.h
+++ b/include/asm-generic/tlb.h
@@ -78,6 +78,14 @@ struct mmu_gather_batch {
 #define MAX_GATHER_BATCH        \
         ((PAGE_SIZE - sizeof(struct mmu_gather_batch)) / sizeof(void *))
 
+/*
+ * Limit the maximum number of mmu_gather batches to reduce a risk of soft
+ * lockups for non-preemptible kernels on huge machines when a lot of memory
+ * is zapped during unmapping.
+ * 10K pages freed at once should be safe even without a preemption point.
+ */
+#define MAX_GATHER_BATCH_COUNT  (10000UL/MAX_GATHER_BATCH)
+
 /* struct mmu_gather is an opaque type used by the mm code for passing around
  * any data needed by arch specific code for tlb_remove_page.
  */
@@ -96,6 +104,7 @@ struct mmu_gather {
         struct mmu_gather_batch *active;
         struct mmu_gather_batch local;
         struct page             *__pages[MMU_GATHER_BUNDLE];
+        unsigned int            batch_count;
 };
 
 #define HAVE_GENERIC_MMU_GATHER
diff --git a/include/linux/ipc_namespace.h b/include/linux/ipc_namespace.h
index fe771978e877..ae221a7b5092 100644
--- a/include/linux/ipc_namespace.h
+++ b/include/linux/ipc_namespace.h
@@ -24,6 +24,7 @@ struct ipc_ids {
         unsigned short seq_max;
         struct rw_semaphore rw_mutex;
         struct idr ipcs_idr;
+        int next_id;
 };
 
 struct ipc_namespace {
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 4bec5be82cab..73b64a38b984 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -503,14 +503,6 @@ struct zone {
          * rarely used fields:
          */
         const char              *name;
-#ifdef CONFIG_MEMORY_ISOLATION
-        /*
-         * the number of MIGRATE_ISOLATE *pageblock*.
-         * We need this for free page counting. Look at zone_watermark_ok_safe.
-         * It's protected by zone->lock
-         */
-        int             nr_pageblock_isolate;
-#endif
 } ____cacheline_internodealigned_in_smp;
 
 typedef enum {
diff --git a/include/linux/msg.h b/include/linux/msg.h
index 7a4b9e97d29a..391af8d11cce 100644
--- a/include/linux/msg.h
+++ b/include/linux/msg.h
@@ -34,7 +34,9 @@ struct msg_queue {
 /* Helper routines for sys_msgsnd and sys_msgrcv */
 extern long do_msgsnd(int msqid, long mtype, void __user *mtext,
                         size_t msgsz, int msgflg);
-extern long do_msgrcv(int msqid, long *pmtype, void __user *mtext,
-                        size_t msgsz, long msgtyp, int msgflg);
+extern long do_msgrcv(int msqid, void __user *buf, size_t bufsz, long msgtyp,
+                      int msgflg,
+                      long (*msg_fill)(void __user *, struct msg_msg *,
+                                       size_t));
 
 #endif /* _LINUX_MSG_H */
diff --git a/include/uapi/linux/msg.h b/include/uapi/linux/msg.h
index 78dbd2f996a3..22d95c6854e0 100644
--- a/include/uapi/linux/msg.h
+++ b/include/uapi/linux/msg.h
@@ -10,6 +10,7 @@
 /* msgrcv options */
 #define MSG_NOERROR     010000  /* no error if message is too big */
 #define MSG_EXCEPT      020000  /* recv any msg except of specified type.*/
+#define MSG_COPY        040000  /* copy (not remove) all queue messages */
 
 /* Obsolete, used only for backwards compatibility and libc5 compiles */
 struct msqid_ds {