linux-kernel - Re: [PATCH v3 1/3] tracing,x86: add a TSC trace

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Date:	Fri, 28 Sep 2012 23:15:54 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	David Sharp <dhsharp@...gle.com>
Cc:	linux-kernel@...r.kernel.org,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Ingo Molnar <mingo@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...ux.intel.com>
Subject: Re: [PATCH v3 1/3] tracing,x86: add a TSC trace_clock

On Thu, 2012-09-20 at 15:52 -0700, David Sharp wrote:

> diff --git a/include/asm-generic/trace_clock.h b/include/asm-generic/trace_clock.h
> new file mode 100644
> index 0000000..6726f1b
> --- /dev/null
> +++ b/include/asm-generic/trace_clock.h
> @@ -0,0 +1,16 @@
> +#ifndef _ASM_GENERIC_TRACE_CLOCK_H
> +#define _ASM_GENERIC_TRACE_CLOCK_H
> +/*
> + * Arch-specific trace clocks.
> + */
> +
> +/*
> + * Additional trace clocks added to the trace_clocks
> + * array in kernel/trace/trace.c
> + * None if the architecture has not defined it.
> + */
> +#ifndef ARCH_TRACE_CLOCKS
> +# define ARCH_TRACE_CLOCKS
> +#endif
> +
> +#endif  /* _ASM_GENERIC_TRACE_CLOCK_H */

Unfortunately this isn't enough. You need to add a stub in all
arch/*/include/asm/ directories. That has:

--- trace_clock.h:
#ifndef _ASM_TRACE_CLOCK_H
#define _ASM_TRACE_CLOCK_H

#include <asm-generic/trace_clock.h>

#endif
---


Because running this against my cross-compile test, failed on all archs
but x86.

-- Steve


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