/* * Copyright 2015, Cyril Bur, IBM Corp. * * 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 test attempts to see if the VMX registers change across a syscall (fork). */ #include #include #include #include #include #include #include #include #include "utils.h" vector int varray[] = {{1, 2, 3, 4}, {5, 6, 7, 8}, {9, 10,11,12}, {13,14,15,16},{17,18,19,20},{21,22,23,24}, {25,26,27,28},{29,30,31,32},{33,34,35,36}, {37,38,39,40},{41,42,43,44},{45,46,47,48}}; extern int test_vmx(vector int *varray, pid_t *pid); int vmx_syscall(void) { pid_t fork_pid; int i; int ret; int child_ret; for (i = 0; i < 1000; i++) { /* test_vmx will fork() */ ret = test_vmx(varray, &fork_pid); if (fork_pid == -1) return -1; if (fork_pid == 0) exit(ret); waitpid(fork_pid, &child_ret, 0); if (ret || child_ret) return 1; } return 0; } int test_vmx_syscall(void) { /* * Setup an environment with much context switching */ pid_t pid2; pid_t pid = fork(); int ret; int child_ret; FAIL_IF(pid == -1); pid2 = fork(); ret = vmx_syscall(); /* Can't FAIL_IF(pid2 == -1); because we've already forked */ if (pid2 == -1) { /* * Couldn't fork, ensure child_ret is set and is a fail */ ret = child_ret = 1; } else { if (pid2) waitpid(pid2, &child_ret, 0); else exit(ret); } ret |= child_ret; if (pid) waitpid(pid, &child_ret, 0); else exit(ret); FAIL_IF(ret || child_ret); return 0; } int main(int argc, char *argv[]) { return test_harness(test_vmx_syscall, "vmx_syscall"); } =nds-private-remove&id=0becc0ae5b42828785b589f686725ff5bc3b9b25'>treecommitdiff
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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 /kernel/gcov
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 'kernel/gcov')