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

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Date:   Wed, 21 Nov 2018 12:10:36 +0200
From:   Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>
To:     David Airlie <airlied@...ux.ie>,
        Hans Holmberg <hans.ml.holmberg@...tronix.com>
Cc:     Jani Nikula <jani.nikula@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        intel-gfx@...ts.freedesktop.org, 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 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?

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
>