50 lines
1.6 KiB
Diff
50 lines
1.6 KiB
Diff
From: Ben Hutchings <ben@decadent.org.uk>
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Date: Thu, 03 Nov 2016 15:25:26 -0600
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Subject: cpupower: Fix checks for CPU existence
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Forwarded: https://marc.info/?l=linux-pm&m=149248268214265
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Calls to cpufreq_cpu_exists(cpu) were converted to
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cpupower_is_cpu_online(cpu) when libcpupower was introduced and the
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former function was deleted. However, cpupower_is_cpu_online() does
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not distinguish physically absent and offline CPUs, and does not set
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errno.
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cpufreq-set has already been fixed (commit c25badc9ceb6).
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In cpufreq-bench, which prints an error message for offline CPUs,
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properly distinguish and report the zero and negative cases.
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Fixes: ac5a181d065d ("cpupower: Add cpuidle parts into library")
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Fixes: 53d1cd6b125f ("cpupowerutils: bench - Fix cpu online check")
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Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
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[carnil: Update/Refresh patch for 4.14.17: The issue with the
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incorrect check has been fixed with upstream commit 53d1cd6b125f.
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Keep in the patch the distinction and report for the zero and
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negative cases.]
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---
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--- a/tools/power/cpupower/bench/system.c
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+++ b/tools/power/cpupower/bench/system.c
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@@ -58,12 +58,19 @@ long long int get_time()
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int set_cpufreq_governor(char *governor, unsigned int cpu)
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{
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+ int rc;
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dprintf("set %s as cpufreq governor\n", governor);
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- if (cpupower_is_cpu_online(cpu) != 1) {
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- perror("cpufreq_cpu_exists");
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- fprintf(stderr, "error: cpu %u does not exist\n", cpu);
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+ rc = cpupower_is_cpu_online(cpu);
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+ if (rc != 1) {
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+ if (rc < 0)
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+ fprintf(stderr, "cpupower_is_cpu_online: %s\n",
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+ strerror(-rc));
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+ else
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+ fprintf(stderr,
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+ "error: cpu %u is offline or does not exist\n",
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+ cpu);
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return -1;
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}
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