/* * POWER Data Stream Control Register (DSCR) fork test * * This testcase modifies the DSCR using mtspr, forks and then * verifies that the child process has the correct changed DSCR * value using mfspr. * * When using the privilege state SPR, the instructions such as * mfspr or mtspr are priviledged and the kernel emulates them * for us. Instructions using problem state SPR can be exuecuted * directly without any emulation if the HW supports them. Else * they also get emulated by the kernel. * * Copyright 2012, Anton Blanchard, IBM Corporation. * Copyright 2015, Anshuman Khandual, IBM Corporation. * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 as published * by the Free Software Foundation. */ #include "dscr.h" int dscr_inherit(void) { unsigned long i, dscr = 0; pid_t pid; srand(getpid()); set_dscr(dscr); for (i = 0; i < COUNT; i++) { unsigned long cur_dscr, cur_dscr_usr; dscr++; if (dscr > DSCR_MAX) dscr = 0; if (i % 2 == 0) set_dscr_usr(dscr); else set_dscr(dscr); pid = fork(); if (pid == -1) { perror("fork() failed"); exit(1); } else if (pid) { int status; if (waitpid(pid, &status, 0) == -1) { perror("waitpid() failed"); exit(1); } if (!WIFEXITED(status)) { fprintf(stderr, "Child didn't exit cleanly\n"); exit(1); } if (WEXITSTATUS(status) != 0) { fprintf(stderr, "Child didn't exit cleanly\n"); return 1; } } else { cur_dscr = get_dscr(); if (cur_dscr != dscr) { fprintf(stderr, "Kernel DSCR should be %ld " "but is %ld\n", dscr, cur_dscr); exit(1); } cur_dscr_usr = get_dscr_usr(); if (cur_dscr_usr != dscr) { fprintf(stderr, "User DSCR should be %ld " "but is %ld\n", dscr, cur_dscr_usr); exit(1); } exit(0); } } return 0; } int main(int argc, char *argv[]) { return test_harness(dscr_inherit, "dscr_inherit_test"); } href='/cgit.cgi/linux/net-next.git/diff/fs/autofs4/dev-ioctl.c?id=cdca06e4e85974d8a3503ab15709dbbaf90d3dd1'>diff
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authorAlexander Stein <alexander.stein@systec-electronic.com>2017-01-30 12:35:28 +0100
committerLinus Walleij <linus.walleij@linaro.org>2017-01-30 15:53:57 +0100
commitcdca06e4e85974d8a3503ab15709dbbaf90d3dd1 (patch)
tree268b0c01070a957006db97c88dccb5fb061440ff /fs/autofs4/dev-ioctl.c
parent1b89970d81bbd52720fc64a3fe9572ee33588363 (diff)
pinctrl: baytrail: Add missing spinlock usage in byt_gpio_irq_handler
According to VLI64 Intel Atom E3800 Specification Update (#329901) concurrent read accesses may result in returning 0xffffffff and write accesses may be dropped silently. To workaround all accesses must be protected by locks. Cc: stable@vger.kernel.org Signed-off-by: Alexander Stein <alexander.stein@systec-electronic.com> Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'fs/autofs4/dev-ioctl.c')