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    SubjectRe: [PATCH 02/16] rcu: Check return value for cpumask allocation
    On Wed, Jul 23, 2014 at 8:06 AM, Paul E. McKenney
    <paulmck@linux.vnet.ibm.com> wrote:
    > On Wed, Jul 23, 2014 at 01:09:39AM -0400, Pranith Kumar wrote:
    >> This commit add a check for return value of zalloc_cpumask_var() used while
    >> allocating cpumask for rcu_nocb_mask.
    >>
    >> Signed-off-by: Pranith Kumar <bobby.prani@gmail.com>
    >> ---
    >> kernel/rcu/tree_plugin.h | 5 ++++-
    >> 1 file changed, 4 insertions(+), 1 deletion(-)
    >>
    >> diff --git a/kernel/rcu/tree_plugin.h b/kernel/rcu/tree_plugin.h
    >> index f07b643..bac9797 100644
    >> --- a/kernel/rcu/tree_plugin.h
    >> +++ b/kernel/rcu/tree_plugin.h
    >> @@ -88,7 +88,10 @@ static void __init rcu_bootup_announce_oddness(void)
    >> #ifdef CONFIG_RCU_NOCB_CPU
    >> #ifndef CONFIG_RCU_NOCB_CPU_NONE
    >> if (!have_rcu_nocb_mask) {
    >> - zalloc_cpumask_var(&rcu_nocb_mask, GFP_KERNEL);
    >> + if (!zalloc_cpumask_var(&rcu_nocb_mask, GFP_KERNEL)) {
    >> + pr_info("rcu_nocb_mask allocation failed\n");
    >> + return;
    >
    > Good catch, but this "return" is an accident waiting to happen. The
    > accident will happen as soon as another RCU option appears, and the
    > person adding it quite naturally adds it at the end of this function.
    > The cleanest approach is to make an rcu_bootup_announce_oddness_nocb()
    > as one commit that does -only- code motion, and the make this change
    > as another commit.
    >

    OK, I will resubmit this change as a 2 patch change.

    --
    Pranith


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