linux-kernel - [PATCH 2/4] powerpc/smp: Move shared

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Message-ID: <20230830105244.62477-3-srikar@linux.vnet.ibm.com>
Date:   Wed, 30 Aug 2023 16:22:42 +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>,
        Juergen Gross <jgross@...e.com>,
        Nicholas Piggin <npiggin@...il.com>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Josh Poimboeuf <jpoimboe@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Paul E McKenney <paulmck@...nel.org>,
        Valentin Schneider <vschneid@...hat.com>,
        Nathan Lynch <nathanl@...ux.ibm.com>,
        virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 2/4] powerpc/smp: Move shared_processor static key to smp.h

The ability to detect if the system is running in a shared processor
mode is helpful in few more generic cases not just in
paravirtualization.
For example: At boot time, different scheduler/ topology flags may be
set based on the processor mode. Hence move it to a more generic file.

Signed-off-by: Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
---
 arch/powerpc/include/asm/paravirt.h | 12 ------------
 arch/powerpc/include/asm/smp.h      | 14 ++++++++++++++
 2 files changed, 14 insertions(+), 12 deletions(-)

diff --git a/arch/powerpc/include/asm/paravirt.h b/arch/powerpc/include/asm/paravirt.h
index f5ba1a3c41f8..3bc8cff97f9a 100644
--- a/arch/powerpc/include/asm/paravirt.h
+++ b/arch/powerpc/include/asm/paravirt.h
@@ -14,13 +14,6 @@
 #include <asm/kvm_guest.h>
 #include <asm/cputhreads.h>
 
-DECLARE_STATIC_KEY_FALSE(shared_processor);
-
-static inline bool is_shared_processor(void)
-{
-	return static_branch_unlikely(&shared_processor);
-}
-
 #ifdef CONFIG_PARAVIRT_TIME_ACCOUNTING
 extern struct static_key paravirt_steal_enabled;
 extern struct static_key paravirt_steal_rq_enabled;
@@ -71,11 +64,6 @@ static inline void yield_to_any(void)
 	plpar_hcall_norets_notrace(H_CONFER, -1, 0);
 }
 #else
-static inline bool is_shared_processor(void)
-{
-	return false;
-}
-
 static inline u32 yield_count_of(int cpu)
 {
 	return 0;
diff --git a/arch/powerpc/include/asm/smp.h b/arch/powerpc/include/asm/smp.h
index aaaa576d0e15..08631b2a4528 100644
--- a/arch/powerpc/include/asm/smp.h
+++ b/arch/powerpc/include/asm/smp.h
@@ -34,6 +34,20 @@ extern bool coregroup_enabled;
 extern int cpu_to_chip_id(int cpu);
 extern int *chip_id_lookup_table;
 
+#ifdef CONFIG_PPC_SPLPAR
+DECLARE_STATIC_KEY_FALSE(shared_processor);
+
+static inline bool is_shared_processor(void)
+{
+	return static_branch_unlikely(&shared_processor);
+}
+#else
+static inline bool is_shared_processor(void)
+{
+	return false;
+}
+#endif
+
 DECLARE_PER_CPU(cpumask_var_t, thread_group_l1_cache_map);
 DECLARE_PER_CPU(cpumask_var_t, thread_group_l2_cache_map);
 DECLARE_PER_CPU(cpumask_var_t, thread_group_l3_cache_map);
-- 
2.41.0