[tip: x86/msr] x86/tsc: Stop using 32-bit MSR interfaces

[tip-bot2 for Juergen Gross]

The following commit has been merged into the x86/msr branch of tip:

Commit-ID:     4ff91f7b8fbfb56424f3b63a3b69286df961bb75
Gitweb:        https://git.kernel.org/tip/4ff91f7b8fbfb56424f3b63a3b69286df961bb75
Author:        Juergen Gross <jgross@xxxxxxxx>
AuthorDate:    Mon, 29 Jun 2026 08:05:05 +02:00
Committer:     Ingo Molnar <mingo@xxxxxxxxxx>
CommitterDate: Thu, 02 Jul 2026 11:54:52 +02:00

x86/tsc: Stop using 32-bit MSR interfaces

The 32-bit MSR interfaces rdmsr() and  rdmsr_safe() are planned to be
removed. Use the related 64-bit variants instead.

Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
Link: https://patch.msgid.link/20260629060526.3638272-15-jgross@xxxxxxxx
---
 arch/x86/kernel/tsc.c     |  6 +++---
 arch/x86/kernel/tsc_msr.c | 15 ++++++++-------
 2 files changed, 11 insertions(+), 10 deletions(-)

diff --git a/arch/x86/kernel/tsc.c b/arch/x86/kernel/tsc.c
index ce10ae4..723347e 100644
--- a/arch/x86/kernel/tsc.c
+++ b/arch/x86/kernel/tsc.c
@@ -1221,11 +1221,11 @@ static void __init check_system_tsc_reliable(void)
 	if (is_geode_lx()) {
 		/* RTSC counts during suspend */
 #define RTSC_SUSP 0x100
-		unsigned long res_low, res_high;
+		u64 res;
 
-		rdmsr_safe(MSR_GEODE_BUSCONT_CONF0, &res_low, &res_high);
+		rdmsrq_safe(MSR_GEODE_BUSCONT_CONF0, &res);
 		/* Geode_LX - the OLPC CPU has a very reliable TSC */
-		if (res_low & RTSC_SUSP)
+		if (res & RTSC_SUSP)
 			tsc_clocksource_reliable = 1;
 	}
 #endif
diff --git a/arch/x86/kernel/tsc_msr.c b/arch/x86/kernel/tsc_msr.c
index 48e6cc1..d74743c 100644
--- a/arch/x86/kernel/tsc_msr.c
+++ b/arch/x86/kernel/tsc_msr.c
@@ -165,7 +165,8 @@ static const struct x86_cpu_id tsc_msr_cpu_ids[] = {
  */
 unsigned long cpu_khz_from_msr(void)
 {
-	u32 lo, hi, ratio, freq, tscref;
+	u32 ratio, freq, tscref;
+	struct msr val;
 	const struct freq_desc *freq_desc;
 	const struct x86_cpu_id *id;
 	const struct muldiv *md;
@@ -178,16 +179,16 @@ unsigned long cpu_khz_from_msr(void)
 
 	freq_desc = (struct freq_desc *)id->driver_data;
 	if (freq_desc->use_msr_plat) {
-		rdmsr(MSR_PLATFORM_INFO, lo, hi);
-		ratio = (lo >> 8) & 0xff;
+		rdmsrq(MSR_PLATFORM_INFO, val.q);
+		ratio = (val.l >> 8) & 0xff;
 	} else {
-		rdmsr(MSR_IA32_PERF_STATUS, lo, hi);
-		ratio = (hi >> 8) & 0x1f;
+		rdmsrq(MSR_IA32_PERF_STATUS, val.q);
+		ratio = (val.h >> 8) & 0x1f;
 	}
 
 	/* Get FSB FREQ ID */
-	rdmsr(MSR_FSB_FREQ, lo, hi);
-	index = lo & freq_desc->mask;
+	rdmsrq(MSR_FSB_FREQ, val.q);
+	index = val.l & freq_desc->mask;
 	md = &freq_desc->muldiv[index];
 
 	/*