/* ADJ_FREQ Skew change test * by: john stultz (johnstul@us.ibm.com) * (C) Copyright IBM 2012 * Licensed under the GPLv2 * * NOTE: This is a meta-test which cranks the ADJ_FREQ knob and * then uses other tests to detect problems. Thus this test requires * that the raw_skew, inconsistency-check and nanosleep tests be * present in the same directory it is run from. * * To build: * $ gcc change_skew.c -o change_skew -lrt * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. */ #include #include #include #include #include #ifdef KTEST #include "../kselftest.h" #else static inline int ksft_exit_pass(void) { exit(0); } static inline int ksft_exit_fail(void) { exit(1); } #endif #define NSEC_PER_SEC 1000000000LL int change_skew_test(int ppm) { struct timex tx; int ret; tx.modes = ADJ_FREQUENCY; tx.freq = ppm << 16; ret = adjtimex(&tx); if (ret < 0) { printf("Error adjusting freq\n"); return ret; } ret = system("./raw_skew"); ret |= system("./inconsistency-check"); ret |= system("./nanosleep"); return ret; } int main(int argv, char **argc) { struct timex tx; int i, ret; int ppm[5] = {0, 250, 500, -250, -500}; /* Kill ntpd */ ret = system("killall -9 ntpd"); /* Make sure there's no offset adjustment going on */ tx.modes = ADJ_OFFSET; tx.offset = 0; ret = adjtimex(&tx); if (ret < 0) { printf("Maybe you're not running as root?\n"); return -1; } for (i = 0; i < 5; i++) { printf("Using %i ppm adjustment\n", ppm[i]); ret = change_skew_test(ppm[i]); if (ret) break; } /* Set things back */ tx.modes = ADJ_FREQUENCY; tx.offset = 0; adjtimex(&tx); if (ret) { printf("[FAIL]"); return ksft_exit_fail(); } printf("[OK]"); return ksft_exit_pass(); } .cgi/linux/net-next.git/log/drivers/usb/wusbcore/wa-nep.c'>
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authorLinus Torvalds <torvalds@linux-foundation.org>2017-01-18 10:47:11 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2017-01-18 10:47:11 -0800
commit49b550fee80b5f36b961640666f7945d7ec63000 (patch)
tree3dd2539f7168f8763c3ac9744234893c92d56585 /drivers/usb/wusbcore/wa-nep.c
parent9da96f99f15169b8bf77a1f27ed6d926f82ea59f (diff)
parent3e4f7a4956e54143f7fc15c636158ad4166d219d (diff)
Merge branch 'rcu-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull RCU fixes from Ingo Molnar: "This fixes sporadic ACPI related hangs in synchronize_rcu() that were caused by the ACPI code mistakenly relying on an aspect of RCU that was neither promised to work nor reliable but which happened to work - until in v4.9 we changed the RCU implementation, which made the hangs more prominent. Since the mis-use of the RCU facility wasn't properly detected and prevented either, these fixes make the RCU side work reliably instead of working around the problem in the ACPI code. Hence the slightly larger diffstat that goes beyond the normal scope of RCU fixes in -rc kernels" * 'rcu-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: rcu: Narrow early boot window of illegal synchronous grace periods rcu: Remove cond_resched() from Tiny synchronize_sched()
Diffstat (limited to 'drivers/usb/wusbcore/wa-nep.c')