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tracing: Add build bug if we have more trace_flags than bits
Add a enum that denotes the last bit of the trace_flags and have a BUILD_BUG_ON(last_bit > 32). If we add more bits than we have in trace_flags, the kernel wont build. Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
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@ -7046,6 +7046,12 @@ __init static int tracer_alloc_buffers(void)
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int ring_buf_size;
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int ring_buf_size;
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int ret = -ENOMEM;
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int ret = -ENOMEM;
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/*
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* Make sure we don't accidently add more trace options
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* than we have bits for.
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*/
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BUILD_BUG_ON(TRACE_ITER_LAST_BIT > 32);
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if (!alloc_cpumask_var(&tracing_buffer_mask, GFP_KERNEL))
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if (!alloc_cpumask_var(&tracing_buffer_mask, GFP_KERNEL))
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goto out;
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goto out;
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@ -966,7 +966,11 @@ extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf,
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#undef C
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#undef C
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#define C(a, b) TRACE_ITER_##a##_BIT
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#define C(a, b) TRACE_ITER_##a##_BIT
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enum trace_iterator_bits { TRACE_FLAGS };
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enum trace_iterator_bits {
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TRACE_FLAGS
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/* Make sure we don't go more than we have bits for */
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TRACE_ITER_LAST_BIT
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};
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/*
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/*
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* By redefining C, we can make TRACE_FLAGS a list of masks that
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* By redefining C, we can make TRACE_FLAGS a list of masks that
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