Merge branch 'master' of /home/davem/src/GIT/linux-2.6/

[sfrench/cifs-2.6.git] / arch / x86 / kernel / cpu / mcheck / mce.c

diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c
index a8aacd4b513c4ac1c8eaeb712806b3fcc208eaee..3ab9c886b61338e80f9a4f4fbc66814fc177f58b 100644 (file)
--- a/arch/x86/kernel/cpu/mcheck/mce.c
+++ b/arch/x86/kernel/cpu/mcheck/mce.c
@@ -46,6 +46,13 @@
 
 #include "mce-internal.h"
 
+static DEFINE_MUTEX(mce_read_mutex);
+
+#define rcu_dereference_check_mce(p) \
+       rcu_dereference_check((p), \
+                             rcu_read_lock_sched_held() || \
+                             lockdep_is_held(&mce_read_mutex))
+
 #define CREATE_TRACE_POINTS
 #include <trace/events/mce.h>
 
@@ -158,7 +165,7 @@ void mce_log(struct mce *mce)
        mce->finished = 0;
        wmb();
        for (;;) {
-               entry = rcu_dereference(mcelog.next);
+               entry = rcu_dereference_check_mce(mcelog.next);
                for (;;) {
                        /*
                         * When the buffer fills up discard new entries.
@@ -1485,8 +1492,6 @@ static void collect_tscs(void *data)
        rdtscll(cpu_tsc[smp_processor_id()]);
 }
 
-static DEFINE_MUTEX(mce_read_mutex);
-
 static ssize_t mce_read(struct file *filp, char __user *ubuf, size_t usize,
                        loff_t *off)
 {
@@ -1500,7 +1505,7 @@ static ssize_t mce_read(struct file *filp, char __user *ubuf, size_t usize,
                return -ENOMEM;
 
        mutex_lock(&mce_read_mutex);
-       next = rcu_dereference(mcelog.next);
+       next = rcu_dereference_check_mce(mcelog.next);
 
        /* Only supports full reads right now */
        if (*off != 0 || usize < MCE_LOG_LEN*sizeof(struct mce)) {
@@ -1565,7 +1570,7 @@ timeout:
 static unsigned int mce_poll(struct file *file, poll_table *wait)
 {
        poll_wait(file, &mce_wait, wait);
-       if (rcu_dereference(mcelog.next))
+       if (rcu_dereference_check_mce(mcelog.next))
                return POLLIN | POLLRDNORM;
        return 0;
 }
@@ -2044,6 +2049,7 @@ static __init void mce_init_banks(void)
                struct mce_bank *b = &mce_banks[i];
                struct sysdev_attribute *a = &b->attr;
 
+               sysfs_attr_init(&a->attr);
                a->attr.name    = b->attrname;
                snprintf(b->attrname, ATTR_LEN, "bank%d", i);