/* * 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 FPU registers change across a syscall (fork). */ #include #include #include #include #include #include #include #include "utils.h" extern int test_fpu(double *darray, pid_t *pid); double darray[] = {0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2.0, 2.1}; int syscall_fpu(void) { pid_t fork_pid; int i; int ret; int child_ret; for (i = 0; i < 1000; i++) { /* test_fpu will fork() */ ret = test_fpu(darray, &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_syscall_fpu(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(); /* Can't FAIL_IF(pid2 == -1); because already forked once */ if (pid2 == -1) { /* * Couldn't fork, ensure test is a fail */ child_ret = ret = 1; } else { ret = syscall_fpu(); 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_syscall_fpu, "syscall_fpu"); } e8d74b02d0a143'>refslogtreecommitdiff
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authorBjorn Helgaas <bhelgaas@google.com>2017-01-27 15:00:45 -0600
committerBjorn Helgaas <bhelgaas@google.com>2017-01-27 15:00:45 -0600
commit030305d69fc6963c16003f50d7e8d74b02d0a143 (patch)
tree363a4e34d199178769b7e7eeb26ea2620a55847b /net/batman-adv/fragmentation.h
parent4d191b1b63c209e37bf27938ef365244d3c41084 (diff)
PCI/ASPM: Handle PCI-to-PCIe bridges as roots of PCIe hierarchies
In a struct pcie_link_state, link->root points to the pcie_link_state of the root of the PCIe hierarchy. For the topmost link, this points to itself (link->root = link). For others, we copy the pointer from the parent (link->root = link->parent->root). Previously we recognized that Root Ports originated PCIe hierarchies, but we treated PCI/PCI-X to PCIe Bridges as being in the middle of the hierarchy, and when we tried to copy the pointer from link->parent->root, there was no parent, and we dereferenced a NULL pointer: BUG: unable to handle kernel NULL pointer dereference at 0000000000000090 IP: [<ffffffff9e424350>] pcie_aspm_init_link_state+0x170/0x820 Recognize that PCI/PCI-X to PCIe Bridges originate PCIe hierarchies just like Root Ports do, so link->root for these devices should also point to itself. Fixes: 51ebfc92b72b ("PCI: Enumerate switches below PCI-to-PCIe bridges") Link: https://bugzilla.kernel.org/show_bug.cgi?id=193411 Link: https://bugzilla.opensuse.org/show_bug.cgi?id=1022181 Tested-by: lists@ssl-mail.com Tested-by: Jayachandran C. <jnair@caviumnetworks.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> CC: stable@vger.kernel.org # v4.2+
Diffstat (limited to 'net/batman-adv/fragmentation.h')