The commit is pushed to "branch-rh7-3.10.0-1160.83.1.vz7.194.x-ovz" and will
appear at https://src.openvz.org/scm/ovz/vzkernel.git
after rh7-3.10.0-1160.83.1.vz7.194.5
------>
commit f7ce23edaf87460d302a3c3bcfe20774c9aaae10
Author: Nikolay Borisov <[email protected]>
Date: Tue Jan 31 14:24:00 2023 +0200
blk-cbt: Don't disable interrupts when working with percpu cache
When working with percpu variables the only guarantee we need is that
the process is not preempted. So let's do this by using the more
idiomatic get_cpu_ptr/put_cpu_ptr rather than the more heavyweight
local_irq_disable. No functional changes.
Fixes: 7f5e9ebe4c63 ("cbt: bitmap corruption caused by ipi")
Signed-off-by: Nikolay Borisov <[email protected]>
---
block/blk-cbt.c | 7 +++----
1 file changed, 3 insertions(+), 4 deletions(-)
diff --git a/block/blk-cbt.c b/block/blk-cbt.c
index 432697f009dc..108c55a8e7d1 100644
--- a/block/blk-cbt.c
+++ b/block/blk-cbt.c
@@ -233,17 +233,16 @@ static void blk_cbt_add(struct request_queue *q, blkcnt_t
start, blkcnt_t len)
__blk_cbt_set(cbt, start, len, 1, 1, NULL, NULL);
goto out_rcu;
}
- local_irq_disable();
- ex = this_cpu_ptr(cbt->cache);
+ ex = get_cpu_ptr(cbt->cache);
if (ex->start + ex->len == start) {
ex->len += len;
- local_irq_enable();
+ put_cpu_ptr(cbt->cache);
goto out_rcu;
}
old = *ex;
ex->start = start;
ex->len = len;
- local_irq_enable();
+ put_cpu_ptr(cbt->cache);
if (likely(old.len))
__blk_cbt_set(cbt, old.start, old.len, 1, 1, NULL, NULL);
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