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Message-ID: <20250706030636.397197-2-me@linux.beauty>
Date: Sun, 6 Jul 2025 11:06:29 +0800
From: Li Chen <me@...ux.beauty>
To: Li Chen <me@...ux.beauty>," Thomas Gleixner "<tglx@...utronix.de>," Ingo Molnar "<mingo@...hat.com>," Borislav Petkov "<bp@...en8.de>," Dave Hansen "<dave.hansen@...ux.intel.com>,<x86@...nel.org>," H . Peter Anvin "<hpa@...or.com>," Rafael J . Wysocki "<rafael.j.wysocki@...el.com>," Peter Zijlstra "<peterz@...radead.org>," Sohil Mehta "<sohil.mehta@...el.com>," Brian Gerst "<brgerst@...il.com>," Patryk Wlazlyn " <patryk.wlazlyn@...ux.intel.com>,
linux-kernel@...r.kernel.org,
Madhavan Srinivasan <maddy@...ux.ibm.com>,
Michael Ellerman <mpe@...erman.id.au>,
Nicholas Piggin <npiggin@...il.com>,
Christophe Leroy <christophe.leroy@...roup.eu>,
Heiko Carstens <hca@...ux.ibm.com>,
Vasily Gorbik <gor@...ux.ibm.com>,
Alexander Gordeev <agordeev@...ux.ibm.com>,
Christian Borntraeger <borntraeger@...ux.ibm.com>,
Sven Schnelle <svens@...ux.ibm.com>,
Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>,
Borislav Petkov <bp@...en8.de>,
Dave Hansen <dave.hansen@...ux.intel.com>,
x86@...nel.org,
"H. Peter Anvin" <hpa@...or.com>,
Peter Zijlstra <peterz@...radead.org>,
Juri Lelli <juri.lelli@...hat.com>,
Vincent Guittot <vincent.guittot@...aro.org>,
Dietmar Eggemann <dietmar.eggemann@....com>,
Steven Rostedt <rostedt@...dmis.org>,
Ben Segall <bsegall@...gle.com>,
Mel Gorman <mgorman@...e.de>,
Valentin Schneider <vschneid@...hat.com>,
Thomas Weißschuh <thomas.weissschuh@...utronix.de>,
Bibo Mao <maobibo@...ngson.cn>,
Li Chen <chenl311@...natelecom.cn>,
Huacai Chen <chenhuacai@...nel.org>,
Tobias Huschle <huschle@...ux.ibm.com>,
Mete Durlu <meted@...ux.ibm.com>,
Joel Granados <joel.granados@...nel.org>,
Guo Weikang <guoweikang.kernel@...il.com>,
"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
Sohil Mehta <sohil.mehta@...el.com>,
K Prateek Nayak <kprateek.nayak@....com>,
Brian Gerst <brgerst@...il.com>,
Patryk Wlazlyn <patryk.wlazlyn@...ux.intel.com>,
Swapnil Sapkal <swapnil.sapkal@....com>,
linuxppc-dev@...ts.ozlabs.org,
linux-s390@...r.kernel.org
Subject: [PATCH v4 1/4] smpboot: introduce SDTL() helper to tidy sched topology setup
From: Li Chen <chenl311@...natelecom.cn>
Define a small SDTL(maskfn, flagsfn, name) macro and use it to build the
sched_domain_topology_level. Purely a cleanup; behaviour is unchanged.
Signed-off-by: Li Chen <chenl311@...natelecom.cn>
Suggested-by: Thomas Gleixner <tglx@...utronix.de>
---
arch/powerpc/kernel/smp.c | 34 +++++++++++++---------------------
arch/s390/kernel/topology.c | 10 +++++-----
arch/x86/kernel/smpboot.c | 21 ++++++---------------
include/linux/sched/topology.h | 6 +++---
kernel/sched/topology.c | 16 ++++++----------
5 files changed, 33 insertions(+), 54 deletions(-)
diff --git a/arch/powerpc/kernel/smp.c b/arch/powerpc/kernel/smp.c
index 5ac7084eebc0b..b05995e272134 100644
--- a/arch/powerpc/kernel/smp.c
+++ b/arch/powerpc/kernel/smp.c
@@ -1700,28 +1700,20 @@ static void __init build_sched_topology(void)
#ifdef CONFIG_SCHED_SMT
if (has_big_cores) {
pr_info("Big cores detected but using small core scheduling\n");
- powerpc_topology[i++] = (struct sched_domain_topology_level){
- smallcore_smt_mask, powerpc_smt_flags, SD_INIT_NAME(SMT)
- };
- } else {
- powerpc_topology[i++] = (struct sched_domain_topology_level){
- cpu_smt_mask, powerpc_smt_flags, SD_INIT_NAME(SMT)
- };
- }
+ powerpc_topology[i++] =
+ SDTL(smallcore_smt_mask, powerpc_smt_flags, SMT);
+ } else
+ powerpc_topology[i++] = SDTL(cpu_smt_mask, powerpc_smt_flags, SMT);
#endif
- if (shared_caches) {
- powerpc_topology[i++] = (struct sched_domain_topology_level){
- shared_cache_mask, powerpc_shared_cache_flags, SD_INIT_NAME(CACHE)
- };
- }
- if (has_coregroup_support()) {
- powerpc_topology[i++] = (struct sched_domain_topology_level){
- cpu_mc_mask, powerpc_shared_proc_flags, SD_INIT_NAME(MC)
- };
- }
- powerpc_topology[i++] = (struct sched_domain_topology_level){
- cpu_cpu_mask, powerpc_shared_proc_flags, SD_INIT_NAME(PKG)
- };
+ if (shared_caches)
+ powerpc_topology[i++] =
+ SDTL(shared_cache_mask, powerpc_shared_cache_flags, CACHE);
+
+ if (has_coregroup_support())
+ powerpc_topology[i++] =
+ SDTL(cpu_mc_mask, powerpc_shared_proc_flags, MC);
+
+ powerpc_topology[i++] = SDTL(cpu_cpu_mask, powerpc_shared_proc_flags, PKG);
/* There must be one trailing NULL entry left. */
BUG_ON(i >= ARRAY_SIZE(powerpc_topology) - 1);
diff --git a/arch/s390/kernel/topology.c b/arch/s390/kernel/topology.c
index 3df048e190b11..ccf5dcc56f86d 100644
--- a/arch/s390/kernel/topology.c
+++ b/arch/s390/kernel/topology.c
@@ -531,11 +531,11 @@ static const struct cpumask *cpu_drawer_mask(int cpu)
}
static struct sched_domain_topology_level s390_topology[] = {
- { cpu_thread_mask, cpu_smt_flags, SD_INIT_NAME(SMT) },
- { cpu_coregroup_mask, cpu_core_flags, SD_INIT_NAME(MC) },
- { cpu_book_mask, SD_INIT_NAME(BOOK) },
- { cpu_drawer_mask, SD_INIT_NAME(DRAWER) },
- { cpu_cpu_mask, SD_INIT_NAME(PKG) },
+ SDTL(cpu_thread_mask, cpu_smt_flags, SMT),
+ SDTL(cpu_coregroup_mask, cpu_core_flags, MC),
+ SDTL(cpu_book_mask, NULL, BOOK),
+ SDTL(cpu_drawer_mask, NULL, DRAWER),
+ SDTL(cpu_cpu_mask, NULL, PKG),
{ NULL, },
};
diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index 58ede3fa6a75b..55f09946c791b 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -485,35 +485,26 @@ static void __init build_sched_topology(void)
int i = 0;
#ifdef CONFIG_SCHED_SMT
- x86_topology[i++] = (struct sched_domain_topology_level){
- cpu_smt_mask, cpu_smt_flags, SD_INIT_NAME(SMT)
- };
+ x86_topology[i++] = SDTL(cpu_smt_mask, cpu_smt_flags, SMT);
#endif
#ifdef CONFIG_SCHED_CLUSTER
- x86_topology[i++] = (struct sched_domain_topology_level){
- cpu_clustergroup_mask, x86_cluster_flags, SD_INIT_NAME(CLS)
- };
+ x86_topology[i++] = SDTL(cpu_clustergroup_mask, x86_cluster_flags, CLS);
#endif
#ifdef CONFIG_SCHED_MC
- x86_topology[i++] = (struct sched_domain_topology_level){
- cpu_coregroup_mask, x86_core_flags, SD_INIT_NAME(MC)
- };
+ x86_topology[i++] = SDTL(cpu_coregroup_mask, x86_core_flags, MC);
#endif
/*
* When there is NUMA topology inside the package skip the PKG domain
* since the NUMA domains will auto-magically create the right spanning
* domains based on the SLIT.
*/
- if (!x86_has_numa_in_package) {
- x86_topology[i++] = (struct sched_domain_topology_level){
- cpu_cpu_mask, x86_sched_itmt_flags, SD_INIT_NAME(PKG)
- };
- }
+ if (!x86_has_numa_in_package)
+ x86_topology[i++] = SDTL(cpu_cpu_mask, x86_sched_itmt_flags, PKG);
/*
* There must be one trailing NULL entry left.
*/
- BUG_ON(i >= ARRAY_SIZE(x86_topology)-1);
+ BUG_ON(i >= ARRAY_SIZE(x86_topology) - 1);
set_sched_topology(x86_topology);
}
diff --git a/include/linux/sched/topology.h b/include/linux/sched/topology.h
index 198bb5cc1774b..0b53e372c445c 100644
--- a/include/linux/sched/topology.h
+++ b/include/linux/sched/topology.h
@@ -197,9 +197,9 @@ struct sched_domain_topology_level {
extern void __init set_sched_topology(struct sched_domain_topology_level *tl);
extern void sched_update_asym_prefer_cpu(int cpu, int old_prio, int new_prio);
-
-# define SD_INIT_NAME(type) .name = #type
-
+#define SDTL(maskfn, flagsfn, dname) \
+ ((struct sched_domain_topology_level) \
+ { .mask = maskfn, .sd_flags = flagsfn, .name = #dname, .numa_level = 0 })
#else /* CONFIG_SMP */
struct sched_domain_attr;
diff --git a/kernel/sched/topology.c b/kernel/sched/topology.c
index b958fe48e0205..e6ec65ae4b75d 100644
--- a/kernel/sched/topology.c
+++ b/kernel/sched/topology.c
@@ -1739,17 +1739,17 @@ sd_init(struct sched_domain_topology_level *tl,
*/
static struct sched_domain_topology_level default_topology[] = {
#ifdef CONFIG_SCHED_SMT
- { cpu_smt_mask, cpu_smt_flags, SD_INIT_NAME(SMT) },
+ SDTL(cpu_smt_mask, cpu_smt_flags, SMT),
#endif
#ifdef CONFIG_SCHED_CLUSTER
- { cpu_clustergroup_mask, cpu_cluster_flags, SD_INIT_NAME(CLS) },
+ SDTL(cpu_clustergroup_mask, cpu_cluster_flags, CLS),
#endif
#ifdef CONFIG_SCHED_MC
- { cpu_coregroup_mask, cpu_core_flags, SD_INIT_NAME(MC) },
+ SDTL(cpu_coregroup_mask, cpu_core_flags, MC),
#endif
- { cpu_cpu_mask, SD_INIT_NAME(PKG) },
+ SDTL(cpu_cpu_mask, NULL, PKG),
{ NULL, },
};
@@ -2010,11 +2010,7 @@ void sched_init_numa(int offline_node)
/*
* Add the NUMA identity distance, aka single NODE.
*/
- tl[i++] = (struct sched_domain_topology_level){
- .mask = sd_numa_mask,
- .numa_level = 0,
- SD_INIT_NAME(NODE)
- };
+ tl[i++] = SDTL(sd_numa_mask, NULL, NODE);
/*
* .. and append 'j' levels of NUMA goodness.
@@ -2025,7 +2021,7 @@ void sched_init_numa(int offline_node)
.sd_flags = cpu_numa_flags,
.flags = SDTL_OVERLAP,
.numa_level = j,
- SD_INIT_NAME(NUMA)
+ .name = "NUMA",
};
}
--
2.49.0
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