The following commit has been merged into the sched/core branch of tip:
Commit-ID: 65e53f869e9f92a23593c66214b88e54fb190a13
Gitweb: https://git.kernel.org/tip/65e53f869e9f92a23593c66214b88e54fb190a13
Author: Frederic Weisbecker <frederic@xxxxxxxxxx>
AuthorDate: Mon, 07 Feb 2022 16:59:09 +01:00
Committer: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
CommitterDate: Wed, 16 Feb 2022 15:57:56 +01:00
sched/isolation: Fix housekeeping_mask memory leak
If "nohz_full=" or "isolcpus=nohz" are called with CONFIG_NO_HZ_FULL=n,
housekeeping_mask doesn't get freed despite it being unused if
housekeeping_setup() is called for the first time.
Check this scenario first to fix this, so that no useless allocation
is performed.
Signed-off-by: Frederic Weisbecker <frederic@xxxxxxxxxx>
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Reviewed-by: Juri Lelli <juri.lelli@xxxxxxxxxx>
Reviewed-by: Paul E. McKenney <paulmck@xxxxxxxxxx>
Reviewed-by: Phil Auld <pauld@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20220207155910.527133-8-frederic@xxxxxxxxxx
---
kernel/sched/isolation.c | 19 ++++++++++---------
1 file changed, 10 insertions(+), 9 deletions(-)
diff --git a/kernel/sched/isolation.c b/kernel/sched/isolation.c
index 828dace..883eee9 100644
--- a/kernel/sched/isolation.c
+++ b/kernel/sched/isolation.c
@@ -94,6 +94,14 @@ static int __init housekeeping_setup(char *str, enum hk_flags flags)
cpumask_var_t non_housekeeping_mask, housekeeping_staging;
int err = 0;
+ if ((flags & HK_FLAG_TICK) && !(housekeeping_flags & HK_FLAG_TICK)) {
+ if (!IS_ENABLED(CONFIG_NO_HZ_FULL)) {
+ pr_warn("Housekeeping: nohz unsupported."
+ " Build with CONFIG_NO_HZ_FULL\n");
+ return 0;
+ }
+ }
+
alloc_bootmem_cpumask_var(&non_housekeeping_mask);
if (cpulist_parse(str, non_housekeeping_mask) < 0) {
pr_warn("Housekeeping: nohz_full= or isolcpus= incorrect CPU range\n");
@@ -123,15 +131,8 @@ static int __init housekeeping_setup(char *str, enum hk_flags flags)
}
}
- if ((flags & HK_FLAG_TICK) && !(housekeeping_flags & HK_FLAG_TICK)) {
- if (IS_ENABLED(CONFIG_NO_HZ_FULL)) {
- tick_nohz_full_setup(non_housekeeping_mask);
- } else {
- pr_warn("Housekeeping: nohz unsupported."
- " Build with CONFIG_NO_HZ_FULL\n");
- goto free_housekeeping_staging;
- }
- }
+ if ((flags & HK_FLAG_TICK) && !(housekeeping_flags & HK_FLAG_TICK))
+ tick_nohz_full_setup(non_housekeeping_mask);
housekeeping_flags |= flags;
err = 1;
|