linux-kernel - [PATCH 1/3] x86/tsc_msr: Use named struct initializers

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: Windows password security audit tool. GUI, reports in PDF.

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

Message-Id: <20200130115255.20840-1-hdegoede@redhat.com>
Date:   Thu, 30 Jan 2020 12:52:53 +0100
From:   Hans de Goede <hdegoede@...hat.com>
To:     Andy Shevchenko <andy@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>
Cc:     Hans de Goede <hdegoede@...hat.com>,
        Vipul Kumar <vipulk0511@...il.com>,
        Vipul Kumar <vipul_kumar@...tor.com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Srikanth Krishnakar <Srikanth_Krishnakar@...tor.com>,
        Cedric Hombourger <Cedric_Hombourger@...tor.com>,
        Len Brown <len.brown@...el.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: [PATCH 1/3] x86/tsc_msr: Use named struct initializers

Use named struct initializers for the freq_desc struct-s initialization
and change the "u8 msr_plat" to a "bool use_msr_plat" to make its meaning
more clear instead of relying on a comment to explain it.

Cc: stable@...r.kernel.org
Signed-off-by: Hans de Goede <hdegoede@...hat.com>
---
 arch/x86/kernel/tsc_msr.c | 28 ++++++++++++++++++----------
 1 file changed, 18 insertions(+), 10 deletions(-)

diff --git a/arch/x86/kernel/tsc_msr.c b/arch/x86/kernel/tsc_msr.c
index e0cbe4f2af49..5fa41ac3feb1 100644
--- a/arch/x86/kernel/tsc_msr.c
+++ b/arch/x86/kernel/tsc_msr.c
@@ -22,10 +22,10 @@
  * read in MSR_PLATFORM_ID[12:8], otherwise in MSR_PERF_STAT[44:40].
  * Unfortunately some Intel Atom SoCs aren't quite compliant to this,
  * so we need manually differentiate SoC families. This is what the
- * field msr_plat does.
+ * field use_msr_plat does.
  */
 struct freq_desc {
-	u8 msr_plat;	/* 1: use MSR_PLATFORM_INFO, 0: MSR_IA32_PERF_STATUS */
+	bool use_msr_plat;
 	u32 freqs[MAX_NUM_FREQS];
 };
 
@@ -35,31 +35,39 @@ struct freq_desc {
  * by MSR based on SDM.
  */
 static const struct freq_desc freq_desc_pnw = {
-	0, { 0, 0, 0, 0, 0, 99840, 0, 83200 }
+	.use_msr_plat = false,
+	.freqs = { 0, 0, 0, 0, 0, 99840, 0, 83200 },
 };
 
 static const struct freq_desc freq_desc_clv = {
-	0, { 0, 133200, 0, 0, 0, 99840, 0, 83200 }
+	.use_msr_plat = false,
+	.freqs = { 0, 133200, 0, 0, 0, 99840, 0, 83200 },
 };
 
 static const struct freq_desc freq_desc_byt = {
-	1, { 83300, 100000, 133300, 116700, 80000, 0, 0, 0 }
+	.use_msr_plat = true,
+	.freqs = { 83300, 100000, 133300, 116700, 80000, 0, 0, 0 },
 };
 
 static const struct freq_desc freq_desc_cht = {
-	1, { 83300, 100000, 133300, 116700, 80000, 93300, 90000, 88900, 87500 }
+	.use_msr_plat = true,
+	.freqs = { 83300, 100000, 133300, 116700, 80000, 93300, 90000,
+		   88900, 87500 },
 };
 
 static const struct freq_desc freq_desc_tng = {
-	1, { 0, 100000, 133300, 0, 0, 0, 0, 0 }
+	.use_msr_plat = true,
+	.freqs = { 0, 100000, 133300, 0, 0, 0, 0, 0 },
 };
 
 static const struct freq_desc freq_desc_ann = {
-	1, { 83300, 100000, 133300, 100000, 0, 0, 0, 0 }
+	.use_msr_plat = true,
+	.freqs = { 83300, 100000, 133300, 100000, 0, 0, 0, 0 },
 };
 
 static const struct freq_desc freq_desc_lgm = {
-	1, { 78000, 78000, 78000, 78000, 78000, 78000, 78000, 78000 }
+	.use_msr_plat = true,
+	.freqs = { 78000, 78000, 78000, 78000, 78000, 78000, 78000, 78000 },
 };
 
 static const struct x86_cpu_id tsc_msr_cpu_ids[] = {
@@ -91,7 +99,7 @@ unsigned long cpu_khz_from_msr(void)
 		return 0;
 
 	freq_desc = (struct freq_desc *)id->driver_data;
-	if (freq_desc->msr_plat) {
+	if (freq_desc->use_msr_plat) {
 		rdmsr(MSR_PLATFORM_INFO, lo, hi);
 		ratio = (lo >> 8) & 0xff;
 	} else {
-- 
2.24.1