linux-kernel - [PATCH] tools/power turbostat: Fix MSRs with CONFIG

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Message-ID: <81f4c402d1fda7c2419aac1148061a0789112e76.1749849645.git.calvin@wbinvd.org>
Date: Fri, 13 Jun 2025 19:20:28 -0700
From: Calvin Owens <calvin@...nvd.org>
To: linux-kernel@...r.kernel.org
Cc: linux-pm@...r.kernel.org,
	Len Brown <lenb@...nel.org>
Subject: [PATCH] tools/power turbostat: Fix MSRs with CONFIG_MULTIUSER=n

Handle ENOSYS from cap_get_proc() in check_for_cap_sys_rawio(), so
turbostat can display temperatures when running on kernels compiled
without multiuser support.

Signed-off-by: Calvin Owens <calvin@...nvd.org>
---
 tools/power/x86/turbostat/turbostat.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/tools/power/x86/turbostat/turbostat.c b/tools/power/x86/turbostat/turbostat.c
index 925556b90770..f7d665913a52 100644
--- a/tools/power/x86/turbostat/turbostat.c
+++ b/tools/power/x86/turbostat/turbostat.c
@@ -6496,8 +6496,13 @@ int check_for_cap_sys_rawio(void)
 	int ret = 0;
 
 	caps = cap_get_proc();
-	if (caps == NULL)
+	if (caps == NULL) {
+		/* Support CONFIG_MULTIUSER=n */
+		if (errno == ENOSYS)
+			return 0;
+
 		return 1;
+	}
 
 	if (cap_get_flag(caps, CAP_SYS_RAWIO, CAP_EFFECTIVE, &cap_flag_value)) {
 		ret = 1;
-- 
2.47.2