[lkml]   [2009]   [Feb]   [26]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
    SubjectRe: [PATCH] make CALLER_ADDRx overwriteable
    Hi Steven,

    On Thu, Feb 26, 2009 at 12:08:06AM -0500, Steven Rostedt wrote:
    > On Wed, Feb 25, 2009 at 11:16:09PM +0100, Uwe Kleine-K??nig wrote:
    > > The current definition of CALLER_ADDRx isn't suitable for all platforms.
    > > E.g. for ARM __builtin_return_address(N) doesn't work for N > 0 and
    > > AFAIK for powerpc there are no frame pointers needed to have a working
    > > __builtin_return_address. This patch allows defining the CALLER_ADDRx
    > > macros in <asm/ftrace.h> and let these take precedence.
    > >
    > > Signed-off-by: Uwe Kleine-K??nig <>
    > Ah, but unfortunately this will break other archs :-(
    > They may not use FTRACE, but they do include the ftrace header (the
    > ftrace.h header can be used for other types of tracing, not just
    > function tracing).
    Then that's from generic files, because the archs that don't have
    <asm/ftrace.h> don't include <linus/ftrace.h> under arch/.

    > A better solution would be to move the CALLER_ADDER0 out of the
    > ftrace.h header completely. Not sure where though. Have a caller.h ?
    > And then we can have ftrace.h include caller.h. A asm/caller.h can be
    > used to override the default.
    Well, but then every arch needs this file. I don't see an advantage
    here. So I'd favour to add an empty ftrace.h for the relevant archs.

    Best regards

    Pengutronix e.K. | Uwe Kleine-König |
    Industrial Linux Solutions | |
    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to
    More majordomo info at
    Please read the FAQ at

     \ /
      Last update: 2009-02-26 14:49    [W:0.023 / U:17.340 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site