linux-kernel - [tip: core/rcu] rcu/tree_plugin: Don't handle the case of 'all' CPU range

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Message-ID: <162506088267.395.9014503789298882918.tip-bot2@tip-bot2>
Date:   Wed, 30 Jun 2021 13:48:02 -0000
From:   "tip-bot2 for Yury Norov" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Yury Norov <yury.norov@...il.com>,
        "Paul E. McKenney" <paulmck@...nel.org>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: core/rcu] rcu/tree_plugin: Don't handle the case of 'all' CPU range

The following commit has been merged into the core/rcu branch of tip:

Commit-ID:     a6814a79f2ca09a5e15e69324213dad29a5844ad
Gitweb:        https://git.kernel.org/tip/a6814a79f2ca09a5e15e69324213dad29a5844ad
Author:        Yury Norov <yury.norov@...il.com>
AuthorDate:    Tue, 20 Apr 2021 20:13:26 -07:00
Committer:     Paul E. McKenney <paulmck@...nel.org>
CommitterDate: Mon, 10 May 2021 15:38:20 -07:00

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, also drop legacy comment in RCU for it.

This patch does not make any functional changes for existing users.

Reviewed-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Signed-off-by: Yury Norov <yury.norov@...il.com>
Signed-off-by: Paul E. McKenney <paulmck@...nel.org>
---
 kernel/rcu/tree_plugin.h |  9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

diff --git a/kernel/rcu/tree_plugin.h b/kernel/rcu/tree_plugin.h
index ad0156b..3f7a345 100644
--- a/kernel/rcu/tree_plugin.h
+++ b/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);