linux-kernel - [PATCH 2/3] x86/resctrl: Replace open code cacheinfo search in pseudo_lock_region

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Date: Fri, 31 May 2024 12:57:19 -0700
From: Tony Luck <tony.luck@...el.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Borislav Petkov <bp@...en8.de>
Cc: Fenghua Yu <fenghua.yu@...el.com>,
	Reinette Chatre <reinette.chatre@...el.com>,
	Maciej Wieczor-Retman <maciej.wieczor-retman@...el.com>,
	Peter Newman <peternewman@...gle.com>,
	James Morse <james.morse@....com>,
	Babu Moger <babu.moger@....com>,
	Drew Fustini <dfustini@...libre.com>,
	Dave Martin <Dave.Martin@....com>,
	linux-kernel@...r.kernel.org,
	patches@...ts.linux.dev,
	Tony Luck <tony.luck@...el.com>
Subject: [PATCH 2/3] x86/resctrl: Replace open code cacheinfo search in pseudo_lock_region_init()

Use get_cpu_cacheinfo_level() instead of open coded search.

Signed-off-by: Tony Luck <tony.luck@...el.com>
---
 arch/x86/kernel/cpu/resctrl/pseudo_lock.c | 17 ++++++-----------
 1 file changed, 6 insertions(+), 11 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/pseudo_lock.c b/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
index aacf236dfe3b..1bbfd3c1e300 100644
--- a/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
+++ b/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
@@ -292,9 +292,8 @@ static void pseudo_lock_region_clear(struct pseudo_lock_region *plr)
  */
 static int pseudo_lock_region_init(struct pseudo_lock_region *plr)
 {
-	struct cpu_cacheinfo *ci;
+	struct cacheinfo *ci;
 	int ret;
-	int i;
 
 	/* Pick the first cpu we find that is associated with the cache. */
 	plr->cpu = cpumask_first(&plr->d->cpu_mask);
@@ -306,15 +305,11 @@ static int pseudo_lock_region_init(struct pseudo_lock_region *plr)
 		goto out_region;
 	}
 
-	ci = get_cpu_cacheinfo(plr->cpu);
-
-	plr->size = rdtgroup_cbm_to_size(plr->s->res, plr->d, plr->cbm);
-
-	for (i = 0; i < ci->num_leaves; i++) {
-		if (ci->info_list[i].level == plr->s->res->cache_level) {
-			plr->line_size = ci->info_list[i].coherency_line_size;
-			return 0;
-		}
+	ci = get_cpu_cacheinfo_level(plr->cpu, plr->s->res->cache_level);
+	if (ci) {
+		plr->line_size = ci->coherency_line_size;
+		plr->size = rdtgroup_cbm_to_size(plr->s->res, plr->d, plr->cbm);
+		return 0;
 	}
 
 	ret = -1;
-- 
2.45.0