/* * kdb helper for dumping the ftrace buffer * * Copyright (C) 2010 Jason Wessel * * ftrace_dump_buf based on ftrace_dump: * Copyright (C) 2007-2008 Steven Rostedt * Copyright (C) 2008 Ingo Molnar * */ #include #include #include #include #include "trace.h" #include "trace_output.h" static void ftrace_dump_buf(int skip_lines, long cpu_file) { /* use static because iter can be a bit big for the stack */ static struct trace_iterator iter; static struct ring_buffer_iter *buffer_iter[CONFIG_NR_CPUS]; struct trace_array *tr; unsigned int old_userobj; int cnt = 0, cpu; trace_init_global_iter(&iter); iter.buffer_iter = buffer_iter; tr = iter.tr; for_each_tracing_cpu(cpu) { atomic_inc(&per_cpu_ptr(iter.trace_buffer->data, cpu)->disabled); } old_userobj = tr->trace_flags; /* don't look at user memory in panic mode */ tr->trace_flags &= ~TRACE_ITER_SYM_USEROBJ; kdb_printf("Dumping ftrace buffer:\n"); /* reset all but tr, trace, and overruns */ memset(&iter.seq, 0, sizeof(struct trace_iterator) - offsetof(struct trace_iterator, seq)); iter.iter_flags |= TRACE_FILE_LAT_FMT; iter.pos = -1; if (cpu_file == RING_BUFFER_ALL_CPUS) { for_each_tracing_cpu(cpu) { iter.buffer_iter[cpu] = ring_buffer_read_prepare(iter.trace_buffer->buffer, cpu); ring_buffer_read_start(iter.buffer_iter[cpu]); tracing_iter_reset(&iter, cpu); } } else { iter.cpu_file = cpu_file; iter.buffer_iter[cpu_file] = ring_buffer_read_prepare(iter.trace_buffer->buffer, cpu_file); ring_buffer_read_start(iter.buffer_iter[cpu_file]); tracing_iter_reset(&iter, cpu_file); } while (trace_find_next_entry_inc(&iter)) { if (!cnt) kdb_printf("---------------------------------\n"); cnt++; if (!skip_lines) { print_trace_line(&iter); trace_printk_seq(&iter.seq); } else { skip_lines--; } if (KDB_FLAG(CMD_INTERRUPT)) goto out; } if (!cnt) kdb_printf(" (ftrace buffer empty)\n"); else kdb_printf("---------------------------------\n"); out: tr->trace_flags = old_userobj; for_each_tracing_cpu(cpu) { atomic_dec(&per_cpu_ptr(iter.trace_buffer->data, cpu)->disabled); } for_each_tracing_cpu(cpu) { if (iter.buffer_iter[cpu]) { ring_buffer_read_finish(iter.buffer_iter[cpu]); iter.buffer_iter[cpu] = NULL; } } } /* * kdb_ftdump - Dump the ftrace log buffer */ static int kdb_ftdump(int argc, const char **argv) { int skip_lines = 0; long cpu_file; char *cp; if (argc > 2) return KDB_ARGCOUNT; if (argc) { skip_lines = simple_strtol(argv[1], &cp, 0); if (*cp) skip_lines = 0; } if (argc == 2) { cpu_file = simple_strtol(argv[2], &cp, 0); if (*cp || cpu_file >= NR_CPUS || cpu_file < 0 || !cpu_online(cpu_file)) return KDB_BADINT; } else { cpu_file = RING_BUFFER_ALL_CPUS; } kdb_trap_printk++; ftrace_dump_buf(skip_lines, cpu_file); kdb_trap_printk--; return 0; } static __init int kdb_ftrace_register(void) { kdb_register_flags("ftdump", kdb_ftdump, "[skip_#lines] [cpu]", "Dump ftrace log", 0, KDB_ENABLE_ALWAYS_SAFE); return 0; } late_initcall(kdb_ftrace_register); d1beb4e7b5c94eca944be9cd23dfc752'>irda_device.h
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authorChristoph Hellwig <hch@lst.de>2017-01-30 13:15:41 +0100
committerBjorn Helgaas <bhelgaas@google.com>2017-02-02 10:35:46 -0600
commitdfef358bd1beb4e7b5c94eca944be9cd23dfc752 (patch)
treeb9a2afb38a4c2ac8ad31f49ec0d71fe9e5b1994c /include/net/irda/irda_device.h
parent030305d69fc6963c16003f50d7e8d74b02d0a143 (diff)
PCI/MSI: Don't apply affinity if there aren't enough vectors left
Bart reported a problem wіth an out of bounds access in the low-level IRQ affinity code, which we root caused to the qla2xxx driver assigning all its MSI-X vectors to the pre and post vectors, and not having any left for the actually spread IRQs. Fix this issue by not asking for affinity assignment when there are no vectors to assign left. Fixes: 402723ad5c62 ("PCI/MSI: Provide pci_alloc_irq_vectors_affinity()") Link: https://lkml.kernel.org/r/1485359225.3093.3.camel@sandisk.com Reported-by: Bart Van Assche <bart.vanassche@sandisk.com> Tested-by: Bart Van Assche <bart.vanassche@sandisk.com> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Diffstat (limited to 'include/net/irda/irda_device.h')