linux-kernel - [PATCH v4 01/10] cpu/hotplug: remove dependancy against cpu_primary_thread

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Message-ID: <20230705145143.40545-2-ldufour@linux.ibm.com>
Date:   Wed,  5 Jul 2023 16:51:34 +0200
From:   Laurent Dufour <ldufour@...ux.ibm.com>
To:     linuxppc-dev@...ts.ozlabs.org
Cc:     linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
        mpe@...erman.id.au, npiggin@...il.com, christophe.leroy@...roup.eu,
        tglx@...utronix.de, dave.hansen@...ux.intel.com, mingo@...hat.com,
        bp@...en8.de, rui.zhang@...el.com
Subject: [PATCH v4 01/10] cpu/hotplug: remove dependancy against cpu_primary_thread_mask

The commit 18415f33e2ac ("cpu/hotplug: Allow "parallel" bringup up to
CPUHP_BP_KICK_AP_STATE") introduce a dependancy against a global variable
cpu_primary_thread_mask exported by the X86 code. This variable is only
used when CONFIG_HOTPLUG_PARALLEL is set.

Since cpuhp_get_primary_thread_mask() and cpuhp_smt_aware() are only used
when CONFIG_HOTPLUG_PARALLEL is set, don't define them when it is not set.

There is no functional change introduce by that patch.

Cc: Thomas Gleixner <tglx@...utronix.de>
Signed-off-by: Laurent Dufour <ldufour@...ux.ibm.com>
---
 kernel/cpu.c | 24 ++++++++++--------------
 1 file changed, 10 insertions(+), 14 deletions(-)

diff --git a/kernel/cpu.c b/kernel/cpu.c
index 88a7ede322bd..03309f2f35a4 100644
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -650,22 +650,8 @@ bool cpu_smt_possible(void)
 }
 EXPORT_SYMBOL_GPL(cpu_smt_possible);
 
-static inline bool cpuhp_smt_aware(void)
-{
-	return topology_smt_supported();
-}
-
-static inline const struct cpumask *cpuhp_get_primary_thread_mask(void)
-{
-	return cpu_primary_thread_mask;
-}
 #else
 static inline bool cpu_smt_allowed(unsigned int cpu) { return true; }
-static inline bool cpuhp_smt_aware(void) { return false; }
-static inline const struct cpumask *cpuhp_get_primary_thread_mask(void)
-{
-	return cpu_present_mask;
-}
 #endif
 
 static inline enum cpuhp_state
@@ -1793,6 +1779,16 @@ static int __init parallel_bringup_parse_param(char *arg)
 }
 early_param("cpuhp.parallel", parallel_bringup_parse_param);
 
+static inline bool cpuhp_smt_aware(void)
+{
+	return topology_smt_supported();
+}
+
+static inline const struct cpumask *cpuhp_get_primary_thread_mask(void)
+{
+	return cpu_primary_thread_mask;
+}
+
 /*
  * On architectures which have enabled parallel bringup this invokes all BP
  * prepare states for each of the to be onlined APs first. The last state
-- 
2.41.0