6 files changed, 70 insertions, 58 deletions

diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 1b4afd2e6ca0..7b2a8ca97ada 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -461,6 +461,15 @@ config DEBUG_MUTEXES
          This feature allows mutex semantics violations to be detected and
          reported.
 
+config BKL
+        bool "Big Kernel Lock" if (SMP || PREEMPT)
+        default y
+        help
+          This is the traditional lock that is used in old code instead
+          of proper locking. All drivers that use the BKL should depend
+          on this symbol.
+          Say Y here unless you are working on removing the BKL.
+
 config DEBUG_LOCK_ALLOC
         bool "Lock debugging: detect incorrect freeing of live locks"
         depends on DEBUG_KERNEL && TRACE_IRQFLAGS_SUPPORT && STACKTRACE_SUPPORT && LOCKDEP_SUPPORT
@@ -482,6 +491,7 @@ config PROVE_LOCKING
         select DEBUG_SPINLOCK
         select DEBUG_MUTEXES
         select DEBUG_LOCK_ALLOC
+        select TRACE_IRQFLAGS
         default n
         help
          This feature enables the kernel to prove that all locking
@@ -539,6 +549,23 @@ config PROVE_RCU_REPEATEDLY
          disabling, allowing multiple RCU-lockdep warnings to be printed
          on a single reboot.
 
+         Say Y to allow multiple RCU-lockdep warnings per boot.
+
+         Say N if you are unsure.
+
+config SPARSE_RCU_POINTER
+        bool "RCU debugging: sparse-based checks for pointer usage"
+        default n
+        help
+         This feature enables the __rcu sparse annotation for
+         RCU-protected pointers.  This annotation will cause sparse
+         to flag any non-RCU used of annotated pointers.  This can be
+         helpful when debugging RCU usage.  Please note that this feature
+         is not intended to enforce code cleanliness; it is instead merely
+         a debugging aid.
+
+         Say Y to make sparse flag questionable use of RCU-protected pointers
+
          Say N if you are unsure.
 
 config LOCKDEP
@@ -579,11 +606,10 @@ config DEBUG_LOCKDEP
           of more runtime overhead.
 
 config TRACE_IRQFLAGS
-        depends on DEBUG_KERNEL
         bool
-        default y
-        depends on TRACE_IRQFLAGS_SUPPORT
-        depends on PROVE_LOCKING
+        help
+          Enables hooks to interrupt enabling and disabling for
+          either tracing or lock debugging.
 
 config DEBUG_SPINLOCK_SLEEP
         bool "Spinlock debugging: sleep-inside-spinlock checking"
@@ -832,6 +858,30 @@ config RCU_CPU_STALL_DETECTOR
 
           Say Y if you are unsure.
 
+config RCU_CPU_STALL_TIMEOUT
+        int "RCU CPU stall timeout in seconds"
+        depends on RCU_CPU_STALL_DETECTOR
+        range 3 300
+        default 60
+        help
+          If a given RCU grace period extends more than the specified
+          number of seconds, a CPU stall warning is printed.  If the
+          RCU grace period persists, additional CPU stall warnings are
+          printed at more widely spaced intervals.
+
+config RCU_CPU_STALL_DETECTOR_RUNNABLE
+        bool "RCU CPU stall checking starts automatically at boot"
+        depends on RCU_CPU_STALL_DETECTOR
+        default y
+        help
+          If set, start checking for RCU CPU stalls immediately on
+          boot.  Otherwise, RCU CPU stall checking must be manually
+          enabled.
+
+          Say Y if you are unsure.
+
+          Say N if you wish to suppress RCU CPU stall checking during boot.
+
 config RCU_CPU_STALL_VERBOSE
         bool "Print additional per-task information for RCU_CPU_STALL_DETECTOR"
         depends on RCU_CPU_STALL_DETECTOR && TREE_PREEMPT_RCU
diff --git a/lib/bug.c b/lib/bug.c
index 7cdfad88128f..19552096d16b 100644
--- a/lib/bug.c
+++ b/lib/bug.c
@@ -72,8 +72,8 @@ static const struct bug_entry *module_find_bug(unsigned long bugaddr)
         return NULL;
 }
 
-int module_bug_finalize(const Elf_Ehdr *hdr, const Elf_Shdr *sechdrs,
-                        struct module *mod)
+void module_bug_finalize(const Elf_Ehdr *hdr, const Elf_Shdr *sechdrs,
+                         struct module *mod)
 {
         char *secstrings;
         unsigned int i;
@@ -97,8 +97,6 @@ int module_bug_finalize(const Elf_Ehdr *hdr, const Elf_Shdr *sechdrs,
          * could potentially lead to deadlock and thus be counter-productive.
          */
         list_add(&mod->bug_list, &module_bug_list);
-
-        return 0;
 }
 
 void module_bug_cleanup(struct module *mod)
diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c
index 02afc2533728..7bd6df781ce5 100644
--- a/lib/dynamic_debug.c
+++ b/lib/dynamic_debug.c
@@ -26,19 +26,11 @@
 #include <linux/dynamic_debug.h>
 #include <linux/debugfs.h>
 #include <linux/slab.h>
+#include <linux/jump_label.h>
 
 extern struct _ddebug __start___verbose[];
 extern struct _ddebug __stop___verbose[];
 
-/* dynamic_debug_enabled, and dynamic_debug_enabled2 are bitmasks in which
- * bit n is set to 1 if any modname hashes into the bucket n, 0 otherwise. They
- * use independent hash functions, to reduce the chance of false positives.
- */
-long long dynamic_debug_enabled;
-EXPORT_SYMBOL_GPL(dynamic_debug_enabled);
-long long dynamic_debug_enabled2;
-EXPORT_SYMBOL_GPL(dynamic_debug_enabled2);
-
 struct ddebug_table {
         struct list_head link;
         char *mod_name;
@@ -88,26 +80,6 @@ static char *ddebug_describe_flags(struct _ddebug *dp, char *buf,
 }
 
 /*
- * must be called with ddebug_lock held
- */
-
-static int disabled_hash(char hash, bool first_table)
-{
-        struct ddebug_table *dt;
-        char table_hash_value;
-
-        list_for_each_entry(dt, &ddebug_tables, link) {
-                if (first_table)
-                        table_hash_value = dt->ddebugs->primary_hash;
-                else
-                        table_hash_value = dt->ddebugs->secondary_hash;
-                if (dt->num_enabled && (hash == table_hash_value))
-                        return 0;
-        }
-        return 1;
-}
-
-/*
  * Search the tables for _ddebug's which match the given
  * `query' and apply the `flags' and `mask' to them.  Tells
  * the user which ddebug's were changed, or whether none
@@ -170,17 +142,9 @@ static void ddebug_change(const struct ddebug_query *query,
                                 dt->num_enabled++;
                         dp->flags = newflags;
                         if (newflags) {
-                                dynamic_debug_enabled |=
-                                                (1LL << dp->primary_hash);
-                                dynamic_debug_enabled2 |=
-                                                (1LL << dp->secondary_hash);
+                                jump_label_enable(&dp->enabled);
                         } else {
-                                if (disabled_hash(dp->primary_hash, true))
-                                        dynamic_debug_enabled &=
-                                                ~(1LL << dp->primary_hash);
-                                if (disabled_hash(dp->secondary_hash, false))
-                                        dynamic_debug_enabled2 &=
-                                                ~(1LL << dp->secondary_hash);
+                                jump_label_disable(&dp->enabled);
                         }
                         if (verbose)
                                 printk(KERN_INFO
diff --git a/lib/list_sort.c b/lib/list_sort.c
index 4b5cb794c38b..a7616fa3162e 100644
--- a/lib/list_sort.c
+++ b/lib/list_sort.c
@@ -70,7 +70,7 @@ static void merge_and_restore_back_links(void *priv,
                  * element comparison is needed, so the client's cmp()
                  * routine can invoke cond_resched() periodically.
                  */
-                (*cmp)(priv, tail, tail);
+                (*cmp)(priv, tail->next, tail->next);
 
                 tail->next->prev = tail;
                 tail = tail->next;
diff --git a/lib/radix-tree.c b/lib/radix-tree.c
index efd16fa80b1c..6f412ab4c24f 100644
--- a/lib/radix-tree.c
+++ b/lib/radix-tree.c
@@ -49,7 +49,7 @@ struct radix_tree_node {
         unsigned int    height;         /* Height from the bottom */
         unsigned int    count;
         struct rcu_head rcu_head;
-        void            *slots[RADIX_TREE_MAP_SIZE];
+        void __rcu      *slots[RADIX_TREE_MAP_SIZE];
         unsigned long   tags[RADIX_TREE_MAX_TAGS][RADIX_TREE_TAG_LONGS];
 };
 
diff --git a/lib/swiotlb.c b/lib/swiotlb.c
index 34e3082632d8..7c06ee51a29a 100644
--- a/lib/swiotlb.c
+++ b/lib/swiotlb.c
@@ -70,7 +70,7 @@ static unsigned long io_tlb_nslabs;
  */
 static unsigned long io_tlb_overflow = 32*1024;
 
-void *io_tlb_overflow_buffer;
+static void *io_tlb_overflow_buffer;
 
 /*
  * This is a free list describing the number of free entries available from
@@ -147,16 +147,16 @@ void __init swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose)
          * to find contiguous free memory regions of size up to IO_TLB_SEGSIZE
          * between io_tlb_start and io_tlb_end.
          */
-        io_tlb_list = alloc_bootmem(io_tlb_nslabs * sizeof(int));
+        io_tlb_list = alloc_bootmem_pages(PAGE_ALIGN(io_tlb_nslabs * sizeof(int)));
         for (i = 0; i < io_tlb_nslabs; i++)
                 io_tlb_list[i] = IO_TLB_SEGSIZE - OFFSET(i, IO_TLB_SEGSIZE);
         io_tlb_index = 0;
-        io_tlb_orig_addr = alloc_bootmem(io_tlb_nslabs * sizeof(phys_addr_t));
+        io_tlb_orig_addr = alloc_bootmem_pages(PAGE_ALIGN(io_tlb_nslabs * sizeof(phys_addr_t)));
 
         /*
          * Get the overflow emergency buffer
          */
-        io_tlb_overflow_buffer = alloc_bootmem_low(io_tlb_overflow);
+        io_tlb_overflow_buffer = alloc_bootmem_low_pages(PAGE_ALIGN(io_tlb_overflow));
         if (!io_tlb_overflow_buffer)
                 panic("Cannot allocate SWIOTLB overflow buffer!\n");
         if (verbose)
@@ -182,7 +182,7 @@ swiotlb_init_with_default_size(size_t default_size, int verbose)
         /*
          * Get IO TLB memory from the low pages
          */
-        io_tlb_start = alloc_bootmem_low_pages(bytes);
+        io_tlb_start = alloc_bootmem_low_pages(PAGE_ALIGN(bytes));
         if (!io_tlb_start)
                 panic("Cannot allocate SWIOTLB buffer");
 
@@ -308,13 +308,13 @@ void __init swiotlb_free(void)
                            get_order(io_tlb_nslabs << IO_TLB_SHIFT));
         } else {
                 free_bootmem_late(__pa(io_tlb_overflow_buffer),
-                                  io_tlb_overflow);
+                                  PAGE_ALIGN(io_tlb_overflow));
                 free_bootmem_late(__pa(io_tlb_orig_addr),
-                                  io_tlb_nslabs * sizeof(phys_addr_t));
+                                  PAGE_ALIGN(io_tlb_nslabs * sizeof(phys_addr_t)));
                 free_bootmem_late(__pa(io_tlb_list),
-                                  io_tlb_nslabs * sizeof(int));
+                                  PAGE_ALIGN(io_tlb_nslabs * sizeof(int)));
                 free_bootmem_late(__pa(io_tlb_start),
-                                  io_tlb_nslabs << IO_TLB_SHIFT);
+                                  PAGE_ALIGN(io_tlb_nslabs << IO_TLB_SHIFT));
         }
 }