linux-kernel - Re: [PATCH] drm/i915/gt: Avoid uninitialized use of rpcurupei in frequency

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Date:   Wed, 29 Apr 2020 07:45:56 +0100
From:   Chris Wilson <chris@...is-wilson.co.uk>
To:     Jani Nikula <jani.nikula@...ux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Nathan Chancellor <natechancellor@...il.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>
Cc:     intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, clang-built-linux@...glegroups.com,
        Nathan Chancellor <natechancellor@...il.com>
Subject: Re: [PATCH] drm/i915/gt: Avoid uninitialized use of rpcurupei in frequency_show

Quoting Nathan Chancellor (2020-04-29 04:00:52)
> When building with clang + -Wuninitialized:
> 
> drivers/gpu/drm/i915/gt/debugfs_gt_pm.c:407:7: warning: variable
> 'rpcurupei' is uninitialized when used here [-Wuninitialized]
>                            rpcurupei,
>                            ^~~~~~~~~
> drivers/gpu/drm/i915/gt/debugfs_gt_pm.c:304:16: note: initialize the
> variable 'rpcurupei' to silence this warning
>                 u32 rpcurupei, rpcurup, rpprevup;
>                              ^
>                               = 0
> 1 warning generated.
> 
> rpupei is assigned twice; based on the second argument to
> intel_uncore_read, it seems this one should have been assigned to
> rpcurupei.
> 
> Fixes: 9c878557b1eb ("drm/i915/gt: Use the RPM config register to determine clk frequencies")
> Link: https://github.com/ClangBuiltLinux/linux/issues/1016
> Signed-off-by: Nathan Chancellor <natechancellor@...il.com>

Thanks.
Reviewed-by: Chris Wilson <chris@...is-wilson.co.uk>
-Chris