/* * Tests for prctl(PR_GET_TSC, ...) / prctl(PR_SET_TSC, ...) * * Tests if the control register is updated correctly * at context switches * * Warning: this test will cause a very high load for a few seconds * */ #include #include #include #include #include #include #include #include /* Get/set the process' ability to use the timestamp counter instruction */ #ifndef PR_GET_TSC #define PR_GET_TSC 25 #define PR_SET_TSC 26 # define PR_TSC_ENABLE 1 /* allow the use of the timestamp counter */ # define PR_TSC_SIGSEGV 2 /* throw a SIGSEGV instead of reading the TSC */ #endif static uint64_t rdtsc(void) { uint32_t lo, hi; /* We cannot use "=A", since this would use %rax on x86_64 */ __asm__ __volatile__ ("rdtsc" : "=a" (lo), "=d" (hi)); return (uint64_t)hi << 32 | lo; } static void sigsegv_expect(int sig) { /* */ } static void segvtask(void) { if (prctl(PR_SET_TSC, PR_TSC_SIGSEGV) < 0) { perror("prctl"); exit(0); } signal(SIGSEGV, sigsegv_expect); alarm(10); rdtsc(); fprintf(stderr, "FATAL ERROR, rdtsc() succeeded while disabled\n"); exit(0); } static void sigsegv_fail(int sig) { fprintf(stderr, "FATAL ERROR, rdtsc() failed while enabled\n"); exit(0); } static void rdtsctask(void) { if (prctl(PR_SET_TSC, PR_TSC_ENABLE) < 0) { perror("prctl"); exit(0); } signal(SIGSEGV, sigsegv_fail); alarm(10); for(;;) rdtsc(); } int main(void) { int n_tasks = 100, i; fprintf(stderr, "[No further output means we're allright]\n"); for (i=0; itreecommitdiff
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authorThomas Gleixner <tglx@linutronix.de>2017-01-31 09:37:34 +0100
committerThomas Gleixner <tglx@linutronix.de>2017-01-31 21:47:58 +0100
commit0becc0ae5b42828785b589f686725ff5bc3b9b25 (patch)
treebe6d0e1f37c38ed0a7dd5da2d4b1e93f0fb43101 /sound/aoa/codecs/onyx.h
parent24c2503255d35c269b67162c397a1a1c1e02f6ce (diff)
x86/mce: Make timer handling more robust
Erik reported that on a preproduction hardware a CMCI storm triggers the BUG_ON in add_timer_on(). The reason is that the per CPU MCE timer is started by the CMCI logic before the MCE CPU hotplug callback starts the timer with add_timer_on(). So the timer is already queued which triggers the BUG. Using add_timer_on() is pretty pointless in this code because the timer is strictlty per CPU, initialized as pinned and all operations which arm the timer happen on the CPU to which the timer belongs. Simplify the whole machinery by using mod_timer() instead of add_timer_on() which avoids the problem because mod_timer() can handle already queued timers. Use __start_timer() everywhere so the earliest armed expiry time is preserved. Reported-by: Erik Veijola <erik.veijola@intel.com> Tested-by: Borislav Petkov <bp@alien8.de> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Borislav Petkov <bp@alien8.de> Cc: Tony Luck <tony.luck@intel.com> Link: http://lkml.kernel.org/r/alpine.DEB.2.20.1701310936080.3457@nanos Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'sound/aoa/codecs/onyx.h')