[PATCH v2 04/10] powerpc/smp: Enable small core scheduling sooner

[Srikar Dronamraju]

Enable small core scheduling as soon as we detect that we are in a
system that supports thread group. Doing so would avoid a redundant
check.

Cc: linuxppc-dev <linuxppc-...@lists.ozlabs.org>
Cc: LKML <linux-kernel@vger.kernel.org>
Cc: Michael Ellerman <micha...@au1.ibm.com>
Cc: Ingo Molnar <mi...@kernel.org>
Cc: Peter Zijlstra <pet...@infradead.org>
Cc: Valentin Schneider <valentin.schnei...@arm.com>
Cc: Nick Piggin <npig...@au1.ibm.com>
Cc: Oliver OHalloran <olive...@au1.ibm.com>
Cc: Nathan Lynch <nath...@linux.ibm.com>
Cc: Michael Neuling <mi...@linux.ibm.com>
Cc: Anton Blanchard <an...@au1.ibm.com>
Cc: Gautham R Shenoy <e...@linux.vnet.ibm.com>
Cc: Vaidyanathan Srinivasan <sva...@linux.ibm.com>
Cc: Jordan Niethe <jniet...@gmail.com>
Signed-off-by: Srikar Dronamraju <sri...@linux.vnet.ibm.com>
---
Changelog v1 -> v2:
powerpc/smp: Enable small core scheduling sooner
        Restored the previous info msg (Jordan)
        Moved big core topology fixup to fixup_topology (Gautham)

 arch/powerpc/kernel/smp.c | 17 +++++++++++------
 1 file changed, 11 insertions(+), 6 deletions(-)

diff --git a/arch/powerpc/kernel/smp.c b/arch/powerpc/kernel/smp.c
index 1ce95da00cb6..72f16dc0cb26 100644
--- a/arch/powerpc/kernel/smp.c
+++ b/arch/powerpc/kernel/smp.c
@@ -1370,6 +1370,16 @@ int setup_profiling_timer(unsigned int multiplier)
        return 0;
 }
 
+static void fixup_topology(void)
+{
+#ifdef CONFIG_SCHED_SMT
+       if (has_big_cores) {
+               pr_info("Big cores detected but using small core scheduling\n");
+               powerpc_topology[0].mask = smallcore_smt_mask;
+       }
+#endif
+}
+
 void __init smp_cpus_done(unsigned int max_cpus)
 {
        /*
@@ -1383,12 +1393,7 @@ void __init smp_cpus_done(unsigned int max_cpus)
 
        dump_numa_cpu_topology();
 
-#ifdef CONFIG_SCHED_SMT
-       if (has_big_cores) {
-               pr_info("Big cores detected but using small core scheduling\n");
-               powerpc_topology[0].mask = smallcore_smt_mask;
-       }
-#endif
+       fixup_topology();
        set_sched_topology(powerpc_topology);
 }
 
-- 
2.17.1