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

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Date:   Wed, 21 Nov 2018 14:37:40 +0200
From:   Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>
To:     Hans Holmberg <hans.ml.holmberg@...tronix.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

Quoting Hans Holmberg (2018-11-21 13:35:19)
> 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).

That's a reasonable explanation, too :)

I unblocked the message from moderation queue so that our CI picks this
up for testing. I will then proceed to merge this once the results are
back.

Thanks for the patch!

Regards, Joonas

> 
> 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
> > >