Commit d34fe509 authored Jun 13, 2025 by Calvin Owens Committed by Len Brown Aug 08, 2025

tools/power turbostat: Handle cap_get_proc() ENOSYS



Kernels configured with CONFIG_MULTIUSER=n have no cap_get_proc().
Check for ENOSYS to recognize this case, and continue on to
attempt to access the requested MSRs (such as temperature).

Signed-off-by: Calvin Owens <calvin@wbinvd.org>
Signed-off-by: Len Brown <len.brown@intel.com>

parent 6ea0ec1b

tools/power/x86/turbostat/turbostat.c

+9 −1

Original line number	Diff line number	Diff line
		@@ -6574,8 +6574,16 @@ int check_for_cap_sys_rawio(void)
		int ret = 0;

		caps = cap_get_proc();
		if (caps == NULL)
		if (caps == NULL) {
		/*
		* CONFIG_MULTIUSER=n kernels have no cap_get_proc()
		* Allow them to continue and attempt to access MSRs
		*/
		if (errno == ENOSYS)
		return 0;

		return 1;
		}

		if (cap_get_flag(caps, CAP_SYS_RAWIO, CAP_EFFECTIVE, &cap_flag_value)) {
		ret = 1;