![]() On boot up, to save memory, ftrace allocates the minimum buffer which is two pages. Ftrace also goes through a series of tests (when configured) on boot up. These tests can fill up a page within a single interrupt. The ring buffer also has a WARN_ON when it detects that the buffer was completely filled within a single commit (other commits are allowed to be nested). Combine the small buffer on start up, with the tests that can fill more than a single page within an interrupt, this can trigger the WARN_ON. This patch makes the WARN_ON only happen when the ring buffer consists of more than two pages. [ Impact: prevent false WARN_ON in ftrace startup tests ] Reported-by: Ingo Molnar <mingo@elte.hu> LKML-Reference: <20090421094616.GA14561@elte.hu> Signed-off-by: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Ingo Molnar <mingo@elte.hu> |
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.. | ||
blktrace.c | ||
ftrace.c | ||
Kconfig | ||
kmemtrace.c | ||
Makefile | ||
ring_buffer.c | ||
trace.c | ||
trace.h | ||
trace_boot.c | ||
trace_branch.c | ||
trace_clock.c | ||
trace_event_profile.c | ||
trace_event_types.h | ||
trace_events.c | ||
trace_events_filter.c | ||
trace_export.c | ||
trace_functions.c | ||
trace_functions_graph.c | ||
trace_hw_branches.c | ||
trace_irqsoff.c | ||
trace_mmiotrace.c | ||
trace_nop.c | ||
trace_output.c | ||
trace_output.h | ||
trace_power.c | ||
trace_printk.c | ||
trace_sched_switch.c | ||
trace_sched_wakeup.c | ||
trace_selftest.c | ||
trace_selftest_dynamic.c | ||
trace_stack.c | ||
trace_stat.c | ||
trace_stat.h | ||
trace_syscalls.c | ||
trace_sysprof.c | ||
trace_workqueue.c |