linux-kernel - Re: [PATCH 1/2] staging/vc04_services: initialize cache line size properly

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Date:   Wed, 01 Mar 2017 17:59:38 -0800
From:   Michael Zoran <mzoran@...wfest.net>
To:     Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Stephen Warren <swarren@...dotorg.org>, Lee Jones <lee@...nel.org>,
        Eric Anholt <eric@...olt.net>,
        Stefan Wahren <stefan.wahren@...e.com>,
        Daniel Stone <daniels@...labora.com>,
        popcornmix <popcornmix@...il.com>,
        linux-rpi-kernel@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, devel@...verdev.osuosl.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] staging/vc04_services: initialize cache line size
 properly

Hi Arnd,

I submitted a change which is in Linux-next now that makes the whole
CACHE_LINE_SIZE macro meaningless.  It now always reads the size from
the DT and errors out with -ENODEV if the property is missing.

I was going to submit a change to delete the macro completely, just
never got to it.

https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git/commit
/drivers/staging/vc04_services/interface?id=6cf1bf636a067eb308cb3a8322b
9d6b1844a075d

On Wed, 2017-03-01 at 23:50 +0100, Arnd Bergmann wrote:
> While debugging another problem I noticed that g_cache_line_size gets
> set
> to sizeof(CACHE_LINE_SIZE), which is sizeof(int) or 4, while
> presumably
> CACHE_LINE_SIZE (e.g. 32) was meant.
> 
> This initializes it the way it was meant.
> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  drivers/staging/vc04_services/interface/vchiq_arm/vchiq_2835_arm.c |
> 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git
> a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_2835_arm.c
> b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_2835_arm.c
> index 3aeffcb9c87e..b0e9eb6ff73f 100644
> ---
> a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_2835_arm.c
> +++
> b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_2835_arm.c
> @@ -78,7 +78,7 @@ struct vchiq_pagelist_info {
>  };
>  
>  static void __iomem *g_regs;
> -static unsigned int g_cache_line_size = sizeof(CACHE_LINE_SIZE);
> +static unsigned int g_cache_line_size = CACHE_LINE_SIZE;
>  static unsigned int g_fragments_size;
>  static char *g_fragments_base;
>  static char *g_free_fragments;