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author | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2014-07-25 11:21:47 -0700 |
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committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2014-09-16 10:07:59 -0700 |
commit | f4579fc57cf4244057b713b1f73f4dc9f0b11e97 (patch) | |
tree | 7c682f8da323a07e5a6d63ad4ff87cc1baf34e73 /init/do_mounts_md.c | |
parent | 11ed7f934cb807f26da09547b5946c2e534d1dac (diff) | |
download | op-kernel-dev-f4579fc57cf4244057b713b1f73f4dc9f0b11e97.zip op-kernel-dev-f4579fc57cf4244057b713b1f73f4dc9f0b11e97.tar.gz |
rcu: Fix attempt to avoid unsolicited offloading of callbacks
Commit b58cc46c5f6b (rcu: Don't offload callbacks unless specifically
requested) failed to adjust the callback lists of the CPUs that are
known to be no-CBs CPUs only because they are also nohz_full= CPUs.
This failure can result in callbacks that are posted during early boot
getting stranded on nxtlist for CPUs whose no-CBs property becomes
apparent late, and there can also be spurious warnings about offline
CPUs posting callbacks.
This commit fixes these problems by adding an early-boot rcu_init_nohz()
that properly initializes the no-CBs CPUs.
Note that kernels built with CONFIG_RCU_NOCB_CPU_ALL=y or with
CONFIG_RCU_NOCB_CPU=n do not exhibit this bug. Neither do kernels
booted without the nohz_full= boot parameter.
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Pranith Kumar <bobby.prani@gmail.com>
Tested-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Diffstat (limited to 'init/do_mounts_md.c')
0 files changed, 0 insertions, 0 deletions