[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: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/arch/x86_64/kernel/mce.c b/arch/x86_64/kernel/mce.c
index 8aa5673..87ea8fd 100644 (file)
--- a/arch/x86_64/kernel/mce.c
+++ b/arch/x86_64/kernel/mce.c
@@ -56,15 +56,19 @@ void mce_log(struct mce *mce)
        smp_wmb();
        for (;;) {
                entry = rcu_dereference(mcelog.next);
-               /* When the buffer fills up discard new entries. Assume 
-                  that the earlier errors are the more interesting. */
-               if (entry >= MCE_LOG_LEN) {
-                       set_bit(MCE_OVERFLOW, &mcelog.flags);
-                       return;
+               for (;;) {
+                       /* When the buffer fills up discard new entries. Assume
+                          that the earlier errors are the more interesting. */
+                       if (entry >= MCE_LOG_LEN) {
+                               set_bit(MCE_OVERFLOW, &mcelog.flags);
+                               return;
+                       }
+                       /* Old left over entry. Skip. */
+                       if (mcelog.entry[entry].finished) {
+                               entry++;
+                               continue;
+                       }
                }
-               /* Old left over entry. Skip. */
-               if (mcelog.entry[entry].finished)
-                       continue;
                smp_rmb();
                next = entry + 1;
                if (cmpxchg(&mcelog.next, entry, next) == entry)
@@ -404,9 +408,15 @@ 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)
-                       continue;
+       for (i = 0; i < next; i++) {            
+               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);