/* Make sure timers don't return early * by: john stultz (johnstul@us.ibm.com) * John Stultz (john.stultz@linaro.org) * (C) Copyright IBM 2012 * (C) Copyright Linaro 2013 2015 * Licensed under the GPLv2 * * To build: * $ gcc nanosleep.c -o nanosleep -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 #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 1000000000ULL #define CLOCK_REALTIME 0 #define CLOCK_MONOTONIC 1 #define CLOCK_PROCESS_CPUTIME_ID 2 #define CLOCK_THREAD_CPUTIME_ID 3 #define CLOCK_MONOTONIC_RAW 4 #define CLOCK_REALTIME_COARSE 5 #define CLOCK_MONOTONIC_COARSE 6 #define CLOCK_BOOTTIME 7 #define CLOCK_REALTIME_ALARM 8 #define CLOCK_BOOTTIME_ALARM 9 #define CLOCK_HWSPECIFIC 10 #define CLOCK_TAI 11 #define NR_CLOCKIDS 12 #define UNSUPPORTED 0xf00f char *clockstring(int clockid) { switch (clockid) { case CLOCK_REALTIME: return "CLOCK_REALTIME"; case CLOCK_MONOTONIC: return "CLOCK_MONOTONIC"; case CLOCK_PROCESS_CPUTIME_ID: return "CLOCK_PROCESS_CPUTIME_ID"; case CLOCK_THREAD_CPUTIME_ID: return "CLOCK_THREAD_CPUTIME_ID"; case CLOCK_MONOTONIC_RAW: return "CLOCK_MONOTONIC_RAW"; case CLOCK_REALTIME_COARSE: return "CLOCK_REALTIME_COARSE"; case CLOCK_MONOTONIC_COARSE: return "CLOCK_MONOTONIC_COARSE"; case CLOCK_BOOTTIME: return "CLOCK_BOOTTIME"; case CLOCK_REALTIME_ALARM: return "CLOCK_REALTIME_ALARM"; case CLOCK_BOOTTIME_ALARM: return "CLOCK_BOOTTIME_ALARM"; case CLOCK_TAI: return "CLOCK_TAI"; }; return "UNKNOWN_CLOCKID"; } /* returns 1 if a <= b, 0 otherwise */ static inline int in_order(struct timespec a, struct timespec b) { if (a.tv_sec < b.tv_sec) return 1; if (a.tv_sec > b.tv_sec) return 0; if (a.tv_nsec > b.tv_nsec) return 0; return 1; } struct timespec timespec_add(struct timespec ts, unsigned long long ns) { ts.tv_nsec += ns; while (ts.tv_nsec >= NSEC_PER_SEC) { ts.tv_nsec -= NSEC_PER_SEC; ts.tv_sec++; } return ts; } int nanosleep_test(int clockid, long long ns) { struct timespec now, target, rel; /* First check abs time */ if (clock_gettime(clockid, &now)) return UNSUPPORTED; target = timespec_add(now, ns); if (clock_nanosleep(clockid, TIMER_ABSTIME, &target, NULL)) return UNSUPPORTED; clock_gettime(clockid, &now); if (!in_order(target, now)) return -1; /* Second check reltime */ clock_gettime(clockid, &now); rel.tv_sec = 0; rel.tv_nsec = 0; rel = timespec_add(rel, ns); target = timespec_add(now, ns); clock_nanosleep(clockid, 0, &rel, NULL); clock_gettime(clockid, &now); if (!in_order(target, now)) return -1; return 0; } int main(int argc, char **argv) { long long length; int clockid, ret; for (clockid = CLOCK_REALTIME; clockid < NR_CLOCKIDS; clockid++) { /* Skip cputime clockids since nanosleep won't increment cputime */ if (clockid == CLOCK_PROCESS_CPUTIME_ID || clockid == CLOCK_THREAD_CPUTIME_ID || clockid == CLOCK_HWSPECIFIC) continue; printf("Nanosleep %-31s ", clockstring(clockid)); length = 10; while (length <= (NSEC_PER_SEC * 10)) { ret = nanosleep_test(clockid, length); if (ret == UNSUPPORTED) { printf("[UNSUPPORTED]\n"); goto next; } if (ret < 0) { printf("[FAILED]\n"); return ksft_exit_fail(); } length *= 100; } printf("[OK]\n"); next: ret = 0; } return ksft_exit_pass(); } nified
authorChristoph Hellwig <hch@lst.de>2017-02-05 18:10:35 +0100
committerJens Axboe <axboe@fb.com>2017-02-06 09:34:46 -0700
commiteeeefd41843218c55a8782a6920f044d9bf6207a (patch)
treec342eac46626e62745aa8e1a982626efca8b121d /net/nfc/hci
parentc14024dbb156c8392908aaa822097d27c6af8ec8 (diff)
block: don't try Write Same from __blkdev_issue_zeroout
Write Same can return an error asynchronously if it turns out the underlying SCSI device does not support Write Same, which makes a proper fallback to other methods in __blkdev_issue_zeroout impossible. Thus only issue a Write Same from blkdev_issue_zeroout an don't try it at all from __blkdev_issue_zeroout as a non-invasive workaround. Signed-off-by: Christoph Hellwig <hch@lst.de> Reported-by: Junichi Nomura <j-nomura@ce.jp.nec.com> Fixes: e73c23ff ("block: add async variant of blkdev_issue_zeroout") Tested-by: Junichi Nomura <j-nomura@ce.jp.nec.com> Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'net/nfc/hci')