linux-kernel - [PATCH 1/2] powerpc/smp: Remove unnecessary variable

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Date:   Mon, 19 Oct 2020 09:57:15 +0530
From:   Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
To:     Michael Ellerman <mpe@...erman.id.au>
Cc:     linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Nathan Lynch <nathanl@...ux.ibm.com>,
        Gautham R Shenoy <ego@...ux.vnet.ibm.com>,
        Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Valentin Schneider <valentin.schneider@....com>,
        Qian Cai <cai@...hat.com>
Subject: [PATCH 1/2] powerpc/smp: Remove unnecessary variable

Commit 3ab33d6dc3e9 ("powerpc/smp: Optimize update_mask_by_l2")
introduced submask_fn in update_mask_by_l2 to track the right submask.
However commit f6606cfdfbcd ("powerpc/smp: Dont assume l2-cache to be
superset of sibling") introduced sibling_mask in update_mask_by_l2 to
track the same submask. Remove sibling_mask in favour of submask_fn.

Signed-off-by: Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
Cc: linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>
Cc: LKML <linux-kernel@...r.kernel.org>
Cc: Michael Ellerman <mpe@...erman.id.au>
Cc: Nathan Lynch <nathanl@...ux.ibm.com>
Cc: Gautham R Shenoy <ego@...ux.vnet.ibm.com>
Cc: Ingo Molnar <mingo@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Valentin Schneider <valentin.schneider@....com>
Cc: Qian Cai <cai@...hat.com>
---
 arch/powerpc/kernel/smp.c | 13 ++++---------
 1 file changed, 4 insertions(+), 9 deletions(-)

diff --git a/arch/powerpc/kernel/smp.c b/arch/powerpc/kernel/smp.c
index 8d1c401f4617..a864b9b3228c 100644
--- a/arch/powerpc/kernel/smp.c
+++ b/arch/powerpc/kernel/smp.c
@@ -1264,18 +1264,16 @@ static bool update_mask_by_l2(int cpu)
 	cpumask_var_t mask;
 	int i;
 
+	if (has_big_cores)
+		submask_fn = cpu_smallcore_mask;
+
 	l2_cache = cpu_to_l2cache(cpu);
 	if (!l2_cache) {
-		struct cpumask *(*sibling_mask)(int) = cpu_sibling_mask;
-
 		/*
 		 * If no l2cache for this CPU, assume all siblings to share
 		 * cache with this CPU.
 		 */
-		if (has_big_cores)
-			sibling_mask = cpu_smallcore_mask;
-
-		for_each_cpu(i, sibling_mask(cpu))
+		for_each_cpu(i, submask_fn(cpu))
 			set_cpus_related(cpu, i, cpu_l2_cache_mask);
 
 		return false;
@@ -1284,9 +1282,6 @@ static bool update_mask_by_l2(int cpu)
 	alloc_cpumask_var_node(&mask, GFP_KERNEL, cpu_to_node(cpu));
 	cpumask_and(mask, cpu_online_mask, cpu_cpu_mask(cpu));
 
-	if (has_big_cores)
-		submask_fn = cpu_smallcore_mask;
-
 	/* Update l2-cache mask with all the CPUs that are part of submask */
 	or_cpumasks_related(cpu, cpu, submask_fn, cpu_l2_cache_mask);
 
-- 
2.18.2