/* * Copyright 2015, Michael Neuling, IBM Corp. * Licensed under GPLv2. * Original: Michael Neuling 19/7/2013 * Edited: Rashmica Gupta 01/12/2015 * * Do some transactions, see if the tar is corrupted. * If the transaction is aborted, the TAR should be rolled back to the * checkpointed value before the transaction began. The value written to * TAR in suspended mode should only remain in TAR if the transaction * completes. */ #include #include #include #include #include "tm.h" #include "utils.h" int num_loops = 10000; int test_tar(void) { int i; SKIP_IF(!have_htm()); for (i = 0; i < num_loops; i++) { uint64_t result = 0; asm __volatile__( "li 7, 1;" "mtspr %[tar], 7;" /* tar = 1 */ "tbegin.;" "beq 3f;" "li 4, 0x7000;" /* Loop lots, to use time */ "2:;" /* Start loop */ "li 7, 2;" "mtspr %[tar], 7;" /* tar = 2 */ "tsuspend.;" "li 7, 3;" "mtspr %[tar], 7;" /* tar = 3 */ "tresume.;" "subi 4, 4, 1;" "cmpdi 4, 0;" "bne 2b;" "tend.;" /* Transaction sucess! TAR should be 3 */ "mfspr 7, %[tar];" "ori %[res], 7, 4;" // res = 3|4 = 7 "b 4f;" /* Abort handler. TAR should be rolled back to 1 */ "3:;" "mfspr 7, %[tar];" "ori %[res], 7, 8;" // res = 1|8 = 9 "4:;" : [res]"=r"(result) : [tar]"i"(SPRN_TAR) : "memory", "r0", "r4", "r7"); /* If result is anything else other than 7 or 9, the tar * value must have been corrupted. */ if ((result != 7) && (result != 9)) return 1; } return 0; } int main(int argc, char *argv[]) { /* A low number of iterations (eg 100) can cause a false pass */ if (argc > 1) { if (strcmp(argv[1], "-h") == 0) { printf("Syntax:\n\t%s []\n", argv[0]); return 1; } else { num_loops = atoi(argv[1]); } } printf("Starting, %d loops\n", num_loops); return test_harness(test_tar, "tm_tar"); } next.git/commit/sound/pci/nm256/nm256.c?id=07cd12945551b63ecb1a349d50a6d69d1d6feb4a'>commitdiff
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authorTejun Heo <tj@kernel.org>2017-01-26 16:47:28 -0500
committerTejun Heo <tj@kernel.org>2017-01-26 16:47:28 -0500
commit07cd12945551b63ecb1a349d50a6d69d1d6feb4a (patch)
tree75f65eba7eac9277971082a2d5a4cf1370562c0c /sound/pci/nm256/nm256.c
parent7ce7d89f48834cefece7804d38fc5d85382edf77 (diff)
cgroup: don't online subsystems before cgroup_name/path() are operational
While refactoring cgroup creation, a5bca2152036 ("cgroup: factor out cgroup_create() out of cgroup_mkdir()") incorrectly onlined subsystems before the new cgroup is associated with it kernfs_node. This is fine for cgroup proper but cgroup_name/path() depend on the associated kernfs_node and if a subsystem makes the new cgroup_subsys_state visible, which they're allowed to after onlining, it can lead to NULL dereference. The current code performs cgroup creation and subsystem onlining in cgroup_create() and cgroup_mkdir() makes the cgroup and subsystems visible afterwards. There's no reason to online the subsystems early and we can simply drop cgroup_apply_control_enable() call from cgroup_create() so that the subsystems are onlined and made visible at the same time. Signed-off-by: Tejun Heo <tj@kernel.org> Reported-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru> Fixes: a5bca2152036 ("cgroup: factor out cgroup_create() out of cgroup_mkdir()") Cc: stable@vger.kernel.org # v4.6+
Diffstat (limited to 'sound/pci/nm256/nm256.c')