linux-kernel - [PATCH 05/14] cpufreq/amd-pstate: Drop `cppc_cap1

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20250206215659.3350066-6-superm1@kernel.org>
Date: Thu,  6 Feb 2025 15:56:50 -0600
From: Mario Limonciello <superm1@...nel.org>
To: "Gautham R . Shenoy" <gautham.shenoy@....com>,
	Perry Yuan <perry.yuan@....com>
Cc: Dhananjay Ugwekar <Dhananjay.Ugwekar@....com>,
	linux-kernel@...r.kernel.org (open list:X86 ARCHITECTURE (32-BIT AND 64-BIT)),
	linux-pm@...r.kernel.org (open list:CPU FREQUENCY SCALING FRAMEWORK),
	Mario Limonciello <mario.limonciello@....com>
Subject: [PATCH 05/14] cpufreq/amd-pstate: Drop `cppc_cap1_cached`

From: Mario Limonciello <mario.limonciello@....com>

The `cppc_cap1_cached` variable isn't used at all, there is no
need to read it at initialization for each CPU.

Signed-off-by: Mario Limonciello <mario.limonciello@....com>
---
 drivers/cpufreq/amd-pstate.c | 5 -----
 drivers/cpufreq/amd-pstate.h | 2 --
 2 files changed, 7 deletions(-)

diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c
index dd230ed3b9579..71636bd9884c8 100644
--- a/drivers/cpufreq/amd-pstate.c
+++ b/drivers/cpufreq/amd-pstate.c
@@ -1529,11 +1529,6 @@ static int amd_pstate_epp_cpu_init(struct cpufreq_policy *policy)
 		if (ret)
 			return ret;
 		WRITE_ONCE(cpudata->cppc_req_cached, value);
-
-		ret = rdmsrl_on_cpu(cpudata->cpu, MSR_AMD_CPPC_CAP1, &value);
-		if (ret)
-			return ret;
-		WRITE_ONCE(cpudata->cppc_cap1_cached, value);
 	}
 	ret = amd_pstate_set_epp(cpudata, cpudata->epp_default);
 	if (ret)
diff --git a/drivers/cpufreq/amd-pstate.h b/drivers/cpufreq/amd-pstate.h
index 6d776c3e5712a..7501d30db9953 100644
--- a/drivers/cpufreq/amd-pstate.h
+++ b/drivers/cpufreq/amd-pstate.h
@@ -71,7 +71,6 @@ struct amd_aperf_mperf {
  * 		  AMD P-State driver supports preferred core featue.
  * @epp_cached: Cached CPPC energy-performance preference value
  * @policy: Cpufreq policy value
- * @cppc_cap1_cached Cached MSR_AMD_CPPC_CAP1 register value
  *
  * The amd_cpudata is key private data for each CPU thread in AMD P-State, and
  * represents all the attributes and goals that AMD P-State requests at runtime.
@@ -101,7 +100,6 @@ struct amd_cpudata {
 	/* EPP feature related attributes*/
 	u8	epp_cached;
 	u32	policy;
-	u64	cppc_cap1_cached;
 	bool	suspended;
 	u8	epp_default;
 };
-- 
2.43.0