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| author |   Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2016-12-20 07:17:58 -0800 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2017-01-23 11:37:13 -0800 |
| commit | fdbb9b315ce40922f3a8d2b8352776d7bc963d84 (patch) | |
| tree | 47e1d70175d586c4c0d35e79f9aa6b6ce11615b7 /lib/Kconfig.debug | |
| parent | rcu: Add comment headers to expedited-grace-period counter functions (diff) | |
| download | wireguard-linux-fdbb9b315ce40922f3a8d2b8352776d7bc963d84.tar.xz wireguard-linux-fdbb9b315ce40922f3a8d2b8352776d7bc963d84.zip | |
rcu: Make rcu_cpu_starting() use its "cpu" argument
The rcu_cpu_starting() function uses this_cpu_ptr() to locate the
incoming CPU's rcu_data structure. This works for the boot CPU and for
all CPUs onlined after rcu_init() executes (during very early boot).
Currently, this is the full set of CPUs, so all is well. But if
anyone ever parallelizes boot before rcu_init() time, it will fail.
This commit therefore substitutes the rcu_cpu_starting() function's
this_cpu_pointer() for per_cpu_ptr(), future-proofing the code and
(arguably) improving readability.
This commit inadvertently fixes a latent bug: If there ever had been
more than just the boot CPU online at rcu_init() time, the old code
would not initialize the non-boot CPUs, but rather would repeatedly
initialize the boot CPU.
Reported-by: Boqun Feng <boqun.feng@gmail.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
Diffstat (limited to 'lib/Kconfig.debug')
0 files changed, 0 insertions, 0 deletions