linux-kernel - [tip: smp/core] MIPS: smp: Remove tick_broadcast

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Message-ID: <158350573449.28353.9285827555774109054.tip-bot2@tip-bot2>
Date:   Fri, 06 Mar 2020 14:42:14 -0000
From:   "tip-bot2 for Peter Xu" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Peter Xu <peterx@...hat.com>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>, x86 <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: [tip: smp/core] MIPS: smp: Remove tick_broadcast_count

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

Commit-ID:     e188f0a50f637391f440b9bf0a1066db71a20889
Gitweb:        https://git.kernel.org/tip/e188f0a50f637391f440b9bf0a1066db71a20889
Author:        Peter Xu <peterx@...hat.com>
AuthorDate:    Mon, 16 Dec 2019 16:31:24 -05:00
Committer:     Ingo Molnar <mingo@...nel.org>
CommitterDate: Fri, 06 Mar 2020 13:42:28 +01:00

MIPS: smp: Remove tick_broadcast_count

Now smp_call_function_single_async() provides the protection that
we'll return with -EBUSY if the csd object is still pending, then we
don't need the tick_broadcast_count counter any more.

Signed-off-by: Peter Xu <peterx@...hat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Signed-off-by: Ingo Molnar <mingo@...nel.org>
Link: https://lkml.kernel.org/r/20191216213125.9536-3-peterx@redhat.com
---
 arch/mips/kernel/smp.c |  9 +--------
 1 file changed, 1 insertion(+), 8 deletions(-)

diff --git a/arch/mips/kernel/smp.c b/arch/mips/kernel/smp.c
index f510c00..0def624 100644
--- a/arch/mips/kernel/smp.c
+++ b/arch/mips/kernel/smp.c
@@ -696,29 +696,22 @@ EXPORT_SYMBOL(flush_tlb_one);
 
 #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
 
-static DEFINE_PER_CPU(atomic_t, tick_broadcast_count);
 static DEFINE_PER_CPU(call_single_data_t, tick_broadcast_csd);
 
 void tick_broadcast(const struct cpumask *mask)
 {
-	atomic_t *count;
 	call_single_data_t *csd;
 	int cpu;
 
 	for_each_cpu(cpu, mask) {
-		count = &per_cpu(tick_broadcast_count, cpu);
 		csd = &per_cpu(tick_broadcast_csd, cpu);
-
-		if (atomic_inc_return(count) == 1)
-			smp_call_function_single_async(cpu, csd);
+		smp_call_function_single_async(cpu, csd);
 	}
 }
 
 static void tick_broadcast_callee(void *info)
 {
-	int cpu = smp_processor_id();
 	tick_receive_broadcast();
-	atomic_set(&per_cpu(tick_broadcast_count, cpu), 0);
 }
 
 static int __init tick_broadcast_init(void)