From 696691985c3191f2c4c76f09b1c7c5f3ca99d5ed Mon Sep 17 00:00:00 2001 From: Srinivas Pandruvada Date: Thu, 5 Mar 2020 14:45:16 -0800 Subject: tools/power/x86/intel-speed-select: Special handling for CPU 0 online/offline When "-o" option for force online/offline is used with command: perf-profile set-config-level If the config level calls for CPU 0 online/offline, then call fails as there is special kernel setup required for CPU 0 online/offline and the currently not setup for that. But when call is for online CPU 0, then don't fail. Just warn that this system is not setup for CPU 0 online/offline. Signed-off-by: Srinivas Pandruvada Signed-off-by: Andy Shevchenko --- tools/power/x86/intel-speed-select/isst-config.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) (limited to 'tools/power') diff --git a/tools/power/x86/intel-speed-select/isst-config.c b/tools/power/x86/intel-speed-select/isst-config.c index 405b03cba248..b8f4846d7c78 100644 --- a/tools/power/x86/intel-speed-select/isst-config.c +++ b/tools/power/x86/intel-speed-select/isst-config.c @@ -220,8 +220,14 @@ static void set_cpu_online_offline(int cpu, int state) "/sys/devices/system/cpu/cpu%d/online", cpu); fd = open(buffer, O_WRONLY); - if (fd < 0) + if (fd < 0) { + if (!cpu && state) { + fprintf(stderr, "This system is not configured for CPU 0 online/offline\n"); + fprintf(stderr, "Ignoring online request for CPU 0 as this is already online\n"); + return; + } err(-1, "%s open failed", buffer); + } if (state) ret = write(fd, "1\n", 2); -- cgit