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rcu: create new rcu_access_index() and use in mce

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The MCE subsystem needs to sample an RCU-protected index outside of
any protection for that index.  If this was a pointer, we would use
rcu_access_pointer(), but there is no corresponding rcu_access_index().
This commit therefore creates an rcu_access_index() and applies it
to MCE.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Tested-by: Zdenek Kabelac <zkabelac@redhat.com>
This commit is contained in:
Paul E. McKenney
2011-04-01 07:15:14 -07:00
parent 0ce790e7d7
commit a4dd99250d
2 changed files with 21 additions and 1 deletions
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2
arch/x86/kernel/cpu/mcheck/mce.c
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@@ -1626,7 +1626,7 @@ out:
static unsigned int mce_poll(struct file *file, poll_table *wait)
{
poll_wait(file, &mce_wait, wait);
if (rcu_dereference_check_mce(mcelog.next))
if (rcu_access_index(mcelog.next))
return POLLIN | POLLRDNORM;
if (!mce_apei_read_done && apei_check_mce())
return POLLIN | POLLRDNORM;