linux-kernel - Re: [PATCH] intel_th: msu: fix unused variables

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Message-ID: <CAMuHMdUEaNto48rxq_8=zx3+9cuMp4UxY=dL0TjbqYo=9dxB9A@mail.gmail.com>
Date:   Wed, 8 May 2019 11:10:55 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Anders Roxell <anders.roxell@...aro.org>
Cc:     Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] intel_th: msu: fix unused variables

On Tue, May 7, 2019 at 3:53 PM Anders Roxell <anders.roxell@...aro.org> wrote:
> When building and CONFIG_X86 isn't set the compiler rightly complains
> about an unused varable 'i', see the warning below:
>
> ../drivers/hwtracing/intel_th/msu.c: In function ‘msc_buffer_win_alloc’:
> ../drivers/hwtracing/intel_th/msu.c:783:21: warning: unused variable ‘i’ [-Wunused-variable]
>   int ret = -ENOMEM, i;
>                      ^
> ../drivers/hwtracing/intel_th/msu.c: In function ‘msc_buffer_win_free’:
> ../drivers/hwtracing/intel_th/msu.c:863:6: warning: unused variable ‘i’ [-Wunused-variable]
>   int i;
>       ^
>
> Rework so that an else part is added where empty functions are created
> for set_memory_uc() and set_memory_wb(), in that way we could remove
> '#ifdef CONFIG_X86' in function msc_buffer_win_alloc() and
> msc_buffer_win_free().
>
> Fixes: ba39bd830605 ("intel_th: msu: Switch over to scatterlist")
> Signed-off-by: Anders Roxell <anders.roxell@...aro.org>

Thanks for your patch!

> --- a/drivers/hwtracing/intel_th/msu.c
> +++ b/drivers/hwtracing/intel_th/msu.c
> @@ -21,6 +21,11 @@
>
>  #ifdef CONFIG_X86
>  #include <asm/set_memory.h>
> +#else
> +static void set_memory_uc(unsigned long addr, int numpages)

static inline?

> +{}
> +static void set_memory_wb(unsigned long addr, int numpages)

static inline?

> +{}
>  #endif

Regardless:
Acked-by: Geert Uytterhoeven <geert@...ux-m68k.org>

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds