This is a note to let you know that I've just added the patch titled
x86/sched: Restore the SD_ASYM_PACKING flag in the DIE domain
to the 6.5-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
x86-sched-restore-the-sd_asym_packing-flag-in-the-di.patch
and it can be found in the queue-6.5 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 9f54b64afe19c51fe0c08de919d7e227a26365d9
Author: Ricardo Neri <ricardo.neri-calderon@xxxxxxxxxxxxxxx>
Date: Mon Aug 14 20:57:47 2023 -0700
x86/sched: Restore the SD_ASYM_PACKING flag in the DIE domain
[ Upstream commit 108af4b4bd3813610701379a58538e3339b162e4 ]
Commit 8f2d6c41e5a6 ("x86/sched: Rewrite topology setup") dropped the
SD_ASYM_PACKING flag in the DIE domain added in commit 044f0e27dec6
("x86/sched: Add the SD_ASYM_PACKING flag to the die domain of hybrid
processors"). Restore it on hybrid processors.
The die-level domain does not depend on any build configuration and now
x86_sched_itmt_flags() is always needed. Remove the build dependency on
CONFIG_SCHED_[SMT|CLUSTER|MC].
Fixes: 8f2d6c41e5a6 ("x86/sched: Rewrite topology setup")
Signed-off-by: Ricardo Neri <ricardo.neri-calderon@xxxxxxxxxxxxxxx>
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
Reviewed-by: Chen Yu <yu.c.chen@xxxxxxxxx>
Tested-by: Caleb Callaway <caleb.callaway@xxxxxxxxx>
Link: https://lkml.kernel.org/r/20230815035747.11529-1-ricardo.neri-calderon@xxxxxxxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index 7d82f0bd449c7..747b83a373a2d 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -587,7 +587,6 @@ static bool match_llc(struct cpuinfo_x86 *c, struct cpuinfo_x86 *o)
}
-#if defined(CONFIG_SCHED_SMT) || defined(CONFIG_SCHED_CLUSTER) || defined(CONFIG_SCHED_MC)
static inline int x86_sched_itmt_flags(void)
{
return sysctl_sched_itmt_enabled ? SD_ASYM_PACKING : 0;
@@ -611,7 +610,14 @@ static int x86_cluster_flags(void)
return cpu_cluster_flags() | x86_sched_itmt_flags();
}
#endif
-#endif
+
+static int x86_die_flags(void)
+{
+ if (cpu_feature_enabled(X86_FEATURE_HYBRID_CPU))
+ return x86_sched_itmt_flags();
+
+ return 0;
+}
/*
* Set if a package/die has multiple NUMA nodes inside.
@@ -653,7 +659,7 @@ static void __init build_sched_topology(void)
*/
if (!x86_has_numa_in_package) {
x86_topology[i++] = (struct sched_domain_topology_level){
- cpu_cpu_mask, SD_INIT_NAME(DIE)
+ cpu_cpu_mask, x86_die_flags, SD_INIT_NAME(DIE)
};
}
