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tools/power turbostat: Handle cap_get_proc() ENOSYS

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[ Upstream commit d34fe509f5 ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Calvin Owens 2025-06-13 19:20:28 -07:00 committed by Greg Kroah-Hartman
parent c723289f4e
commit 54d959676d
1 changed files with 9 additions and 1 deletions
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10
tools/power/x86/turbostat/turbostat.c
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@ -6573,8 +6573,16 @@ 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;