/* * trace context switch * * Copyright (C) 2007 Steven Rostedt * */ #include #include #include #include #include #include "trace.h" static int sched_ref; static DEFINE_MUTEX(sched_register_mutex); static void probe_sched_switch(void *ignore, bool preempt, struct task_struct *prev, struct task_struct *next) { if (unlikely(!sched_ref)) return; tracing_record_cmdline(prev); tracing_record_cmdline(next); } static void probe_sched_wakeup(void *ignore, struct task_struct *wakee) { if (unlikely(!sched_ref)) return; tracing_record_cmdline(current); } static int tracing_sched_register(void) { int ret; ret = register_trace_sched_wakeup(probe_sched_wakeup, NULL); if (ret) { pr_info("wakeup trace: Couldn't activate tracepoint" " probe to kernel_sched_wakeup\n"); return ret; } ret = register_trace_sched_wakeup_new(probe_sched_wakeup, NULL); if (ret) { pr_info("wakeup trace: Couldn't activate tracepoint" " probe to kernel_sched_wakeup_new\n"); goto fail_deprobe; } ret = register_trace_sched_switch(probe_sched_switch, NULL); if (ret) { pr_info("sched trace: Couldn't activate tracepoint" " probe to kernel_sched_switch\n"); goto fail_deprobe_wake_new; } return ret; fail_deprobe_wake_new: unregister_trace_sched_wakeup_new(probe_sched_wakeup, NULL); fail_deprobe: unregister_trace_sched_wakeup(probe_sched_wakeup, NULL); return ret; } static void tracing_sched_unregister(void) { unregister_trace_sched_switch(probe_sched_switch, NULL); unregister_trace_sched_wakeup_new(probe_sched_wakeup, NULL); unregister_trace_sched_wakeup(probe_sched_wakeup, NULL); } static void tracing_start_sched_switch(void) { mutex_lock(&sched_register_mutex); if (!(sched_ref++)) tracing_sched_register(); mutex_unlock(&sched_register_mutex); } static void tracing_stop_sched_switch(void) { mutex_lock(&sched_register_mutex); if (!(--sched_ref)) tracing_sched_unregister(); mutex_unlock(&sched_register_mutex); } void tracing_start_cmdline_record(void) { tracing_start_sched_switch(); } void tracing_stop_cmdline_record(void) { tracing_stop_sched_switch(); } common.c?h=nds-private-remove&id=ce1ca7d2d140a1f4aaffd297ac487f246963dd2f'>diff
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authorSriharsha Basavapatna <sriharsha.basavapatna@broadcom.com>2017-01-09 16:00:44 +0530
committerJ. Bruce Fields <bfields@redhat.com>2017-01-12 16:14:47 -0500
commitce1ca7d2d140a1f4aaffd297ac487f246963dd2f (patch)
tree5aeab5e0cb6ef404c894a18251588278b9432a2c /tools/lib/lockdep/common.c
parent546125d1614264d26080817d0c8cddb9b25081fa (diff)
svcrdma: avoid duplicate dma unmapping during error recovery
In rdma_read_chunk_frmr() when ib_post_send() fails, the error code path invokes ib_dma_unmap_sg() to unmap the sg list. It then invokes svc_rdma_put_frmr() which in turn tries to unmap the same sg list through ib_dma_unmap_sg() again. This second unmap is invalid and could lead to problems when the iova being unmapped is subsequently reused. Remove the call to unmap in rdma_read_chunk_frmr() and let svc_rdma_put_frmr() handle it. Fixes: 412a15c0fe53 ("svcrdma: Port to new memory registration API") Cc: stable@vger.kernel.org Signed-off-by: Sriharsha Basavapatna <sriharsha.basavapatna@broadcom.com> Reviewed-by: Chuck Lever <chuck.lever@oracle.com> Reviewed-by: Yuval Shaia <yuval.shaia@oracle.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Diffstat (limited to 'tools/lib/lockdep/common.c')