[PATCH] x86-64: Make lockless machine check record passing a bit more robust.

One machine is constantly throwing NMI watchdog timeouts in mce_log

This was one attempt to fix it.

(AK: this doesn't actually fix the bug I'm seeing unfortunately, probably
drop.  I don't like it that the reader can spin forever now waiting
for a writer)
Signed-off-by: NAndi Kleen <ak@suse.de>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

arch/x86_64/kernel/mce.c

@@ -56,6 +56,7 @@ void mce_log(struct mce *mce)
 	smp_wmb();
 	for (;;) {
 		entry = rcu_dereference(mcelog.next);
+		for (;;) {
 			/* When the buffer fills up discard new entries. Assume
 			   that the earlier errors are the more interesting. */
 			if (entry >= MCE_LOG_LEN) {
@@ -63,8 +64,11 @@ void mce_log(struct mce *mce)
 				return;
 			}
 			/* Old left over entry. Skip. */
-		if (mcelog.entry[entry].finished)
+			if (mcelog.entry[entry].finished) {
+				entry++;
 				continue;
+			}
+		}
 		smp_rmb();
 		next = entry + 1;
 		if (cmpxchg(&mcelog.next, entry, next) == entry)
@@ -405,8 +409,14 @@ static ssize_t mce_read(struct file *filp, char __user *ubuf, size_t usize, loff
 
 	err = 0;
 	for (i = 0; i < next; i++) {		
-		if (!mcelog.entry[i].finished)
+		unsigned long start = jiffies;
+		while (!mcelog.entry[i].finished) {
+			if (!time_before(jiffies, start + 2)) {
+				memset(mcelog.entry + i,0, sizeof(struct mce));
 				continue;
+			}
+			cpu_relax();
+		}
 		smp_rmb();
 		err |= copy_to_user(buf, mcelog.entry + i, sizeof(struct mce));
 		buf += sizeof(struct mce);