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ftrace: allow trace_pipe to block on all reads 

We expect things like "cat" to block on reads to trace_pipe. That's what
trace_pipe is for.

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
hifive-unleashed-5.1
Steven Rostedt 2008-05-12 21:20:58 +02:00 committed by Thomas Gleixner
parent d17d969160
commit 8487c23765
1 changed files with 0 additions and 2 deletions
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2
kernel/trace/trace.c
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@ -2231,8 +2231,6 @@ tracing_read_pipe(struct file *filp, char __user *ubuf,
start = 0;
while (trace_empty(iter)) {
if (!(trace_flags & TRACE_ITER_BLOCK))
return -EWOULDBLOCK;
/*
* This is a make-shift waitqueue. The reason we don't use
* an actual wait queue is because: