The patch titled
Subject: rcu/tree_plugin: don't handle the case of 'all' CPU range
has been added to the -mm tree. Its filename is
rcu-tree_plugin-dont-handle-the-case-of-all-cpu-range.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/rcu-tree_plugin-dont-handle-the-case-of-all-cpu-range.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/rcu-tree_plugin-dont-handle-the-case-of-all-cpu-range.patch
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------------------------------------------------------
From: Yury Norov <yury.norov@xxxxxxxxx>
Subject: rcu/tree_plugin: don't handle the case of 'all' CPU range
The 'all' semantics is now supported by the bitmap_parselist() so we can
drop supporting it as a special case in RCU code. Since 'all' is properly
supported in core bitmap code, drop legacy comment in RCU for it.
This patch does not add any functional changes for existing users.
Link: https://lkml.kernel.org/r/20210421031326.72816-3-yury.norov@xxxxxxxxx
Signed-off-by: Yury Norov <yury.norov@xxxxxxxxx>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
Cc: "Paul E. McKenney" <paulmck@xxxxxxxxxx>
Cc: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
Cc: Joel Fernandes <joel@xxxxxxxxxxxxxxxxx>
Cc: Jonathan Corbet <corbet@xxxxxxx>
Cc: Lai Jiangshan <jiangshanlai@xxxxxxxxx>
Cc: Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxxxx>
Cc: Palmer Dabbelt <palmerdabbelt@xxxxxxxxxx>
Cc: Paul Gortmaker <paul.gortmaker@xxxxxxxxxxxxx>
Cc: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
Cc: Rasmus Villemoes <linux@xxxxxxxxxxxxxxxxxx>
Cc: Steven Rostedt <rostedt@xxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
kernel/rcu/tree_plugin.h | 9 +++------
1 file changed, 3 insertions(+), 6 deletions(-)
--- a/kernel/rcu/tree_plugin.h~rcu-tree_plugin-dont-handle-the-case-of-all-cpu-range
+++ a/kernel/rcu/tree_plugin.h
@@ -1535,13 +1535,10 @@ static void rcu_cleanup_after_idle(void)
static int __init rcu_nocb_setup(char *str)
{
alloc_bootmem_cpumask_var(&rcu_nocb_mask);
- if (!strcasecmp(str, "all")) /* legacy: use "0-N" instead */
+ if (cpulist_parse(str, rcu_nocb_mask)) {
+ pr_warn("rcu_nocbs= bad CPU range, all CPUs set\n");
cpumask_setall(rcu_nocb_mask);
- else
- if (cpulist_parse(str, rcu_nocb_mask)) {
- pr_warn("rcu_nocbs= bad CPU range, all CPUs set\n");
- cpumask_setall(rcu_nocb_mask);
- }
+ }
return 1;
}
__setup("rcu_nocbs=", rcu_nocb_setup);
_
Patches currently in -mm which might be from yury.norov@xxxxxxxxx are
bitmap_parse-support-all-semantics.patch
rcu-tree_plugin-dont-handle-the-case-of-all-cpu-range.patch
