/* * 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"); } /a>commitdiff
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authorLinus Torvalds <torvalds@linux-foundation.org>2017-02-08 09:56:15 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2017-02-08 09:56:15 -0800
commit23fbe2cdc1de80120cf9ccd478ac57c3a3a0764b (patch)
tree4aff32d5f2f6fe2f54028bfd4d1b66fdd2f8d281 /include/crypto/internal/rsa.h
parent926af6273fc683cd98cd0ce7bf0d04a02eed6742 (diff)
parenteeeefd41843218c55a8782a6920f044d9bf6207a (diff)
Merge branch 'for-linus' of git://git.kernel.dk/linux-block
Pull block fix from Jens Axboe: "A single fix that should go into 4.10, fixing a regression on some devices with the WRITE_SAME command" * 'for-linus' of git://git.kernel.dk/linux-block: block: don't try Write Same from __blkdev_issue_zeroout
Diffstat (limited to 'include/crypto/internal/rsa.h')