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

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Date: Fri, 31 May 2024 12:57:20 -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 3/3] x86/resctrl: Replace open code cacheinfo search in rdtgroup_cbm_to_size()

Use get_cpu_cacheinfo_level() instead of open coded search.

Signed-off-by: Tony Luck <tony.luck@...el.com>
---
 arch/x86/kernel/cpu/resctrl/rdtgroup.c | 14 +++++---------
 1 file changed, 5 insertions(+), 9 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 02f213f1c51c..4a5ab0f6a412 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -1450,18 +1450,14 @@ static ssize_t rdtgroup_mode_write(struct kernfs_open_file *of,
 unsigned int rdtgroup_cbm_to_size(struct rdt_resource *r,
 				  struct rdt_domain *d, unsigned long cbm)
 {
-	struct cpu_cacheinfo *ci;
+	struct cacheinfo *ci;
 	unsigned int size = 0;
-	int num_b, i;
+	int num_b;
 
 	num_b = bitmap_weight(&cbm, r->cache.cbm_len);
-	ci = get_cpu_cacheinfo(cpumask_any(&d->cpu_mask));
-	for (i = 0; i < ci->num_leaves; i++) {
-		if (ci->info_list[i].level == r->cache_level) {
-			size = ci->info_list[i].size / r->cache.cbm_len * num_b;
-			break;
-		}
-	}
+	ci = get_cpu_cacheinfo_level(cpumask_any(&d->cpu_mask), r->cache_level);
+	if (ci)
+		size = ci->size / r->cache.cbm_len * num_b;
 
 	return size;
 }
-- 
2.45.0