linux-kernel - Re: [PATCH] drm/i915: avoid rebuilding i915_gpu

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Date:   Wed, 21 Nov 2018 12:35:19 +0100
From:   Hans Holmberg <hans.ml.holmberg@...tronix.com>
To:     Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>
Cc:     David Airlie <airlied@...ux.ie>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        intel-gfx@...ts.freedesktop.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Hans Holmberg <hans.holmberg@...xlabs.com>
Subject: Re: [PATCH] drm/i915: avoid rebuilding i915_gpu_error.o on version
 string updates

On Wed, Nov 21, 2018 at 11:10 AM Joonas Lahtinen
<joonas.lahtinen@...ux.intel.com> wrote:
>
> Quoting Hans Holmberg (2018-11-21 11:54:23)
> > From: Hans Holmberg <hans.holmberg@...xlabs.com>
> >
> > There is no need to rebuild i915_gpu_error.o when the version string
> > changes as the version is available in init_utsname()->release.
> >
> > Signed-off-by: Hans Holmberg <hans.holmberg@...xlabs.com>
>
> Seems reasonable to me.
>
> Reviewed-by: Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>
>
> Out of curiosity, are you by any chance hashing the i915_gpu_error.o
> file (or the contents elsewhere) for some purpose?

Oh no, I was just moderately annoyed by the file being rebuilt every
time the version was updated(I use my current branch name as
LOCALVERSION when building).

Thanks,
Hans
>
> Regards, Joonas
>
> > ---
> >  drivers/gpu/drm/i915/i915_gpu_error.c | 4 ++--
> >  1 file changed, 2 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/i915/i915_gpu_error.c b/drivers/gpu/drm/i915/i915_gpu_error.c
> > index 8762d17b6659..958e1484a3dd 100644
> > --- a/drivers/gpu/drm/i915/i915_gpu_error.c
> > +++ b/drivers/gpu/drm/i915/i915_gpu_error.c
> > @@ -27,7 +27,7 @@
> >   *
> >   */
> >
> > -#include <generated/utsrelease.h>
> > +#include <linux/utsname.h>
> >  #include <linux/stop_machine.h>
> >  #include <linux/zlib.h>
> >  #include <drm/drm_print.h>
> > @@ -650,7 +650,7 @@ int i915_error_state_to_str(struct drm_i915_error_state_buf *m,
> >
> >         if (*error->error_msg)
> >                 err_printf(m, "%s\n", error->error_msg);
> > -       err_printf(m, "Kernel: " UTS_RELEASE "\n");
> > +       err_printf(m, "Kernel: %s\n", init_utsname()->release);
> >         ts = ktime_to_timespec64(error->time);
> >         err_printf(m, "Time: %lld s %ld us\n",
> >                    (s64)ts.tv_sec, ts.tv_nsec / NSEC_PER_USEC);
> > --
> > 2.17.1
> >