[U-Boot] [PATCH v3 2/4] ARM: cache: add an empty stub function for invalidate/flush dcache

[Josh Wu <josh.wu@atmel.com>]

Hi, York

On 7/28/2015 12:24 PM, York Sun wrote:
> Please search the same name function in the same file.

yes, there still have flush_dcache_range() & invalidate_dcache_range() 
function defined in case of DCACHE is enabled (CONFIG_SYS_DCACHE_OFF is 
not defined).
And in that case, the empty weak functions flush_dcache_range() & 
invalidate_dcache_range() in arch/arm/lib/cache.c will be ignored. It is 
an expect behavior.

or did I miss something?

Best Regards,
Josh Wu

>
> York
>
> Sent from my cellphone
>
>
> -------- Original message --------
> From: Josh Wu
> Date:07/27/2015 19:17 (GMT-08:00)
> To: Sun York-R58495 , U-Boot Mailing List , Marek Vasut , Tom Rini
> Cc: Masahiro Yamada , Jeroen Hofstee , Valentine Barshak , Simon Glass 
> , Thierry Reding , Masahiro Yamada , Heiko Schocher , Albert Aribaud , 
> Nobuhiro Iwamatsu
> Subject: Re: [PATCH v3 2/4] ARM: cache: add an empty stub function for 
> invalidate/flush dcache
>
> Hi, York
>
> On 7/28/2015 12:31 AM, York Sun wrote:
> >
> > On 07/26/2015 08:40 PM, Josh Wu wrote:
> >> Since some driver like ohci, lcd used dcache functions. But some ARM
> >> cpu don't implement the invalidate_dcache_range()/flush_dcache_range()
> >> functions.
> >>
> >> To avoid compiling errors this patch adds an weak empty stub function
> >> for all ARM cpu in arch/arm/lib/cache.c.
> >> And ARM cpu still can implemnt its own cache functions on the cpu 
> folder.
> >>
> >> Signed-off-by: Josh Wu <josh.wu@atmel.com>
> >> ---
> >>
> >> Changes in v3:
> >> - remove the same functions in the cpu/ files as they will use the weak
> >>    function provided in lib/cache.c
> >>
> >> Changes in v2:
> >> - new added.
> >>
> > <snip>
> >
> >> diff --git a/arch/arm/cpu/armv8/cache_v8.c 
> b/arch/arm/cpu/armv8/cache_v8.c
> >> index c5ec529..f8c17cc 100644
> >> --- a/arch/arm/cpu/armv8/cache_v8.c
> >> +++ b/arch/arm/cpu/armv8/cache_v8.c
> >> @@ -149,14 +149,6 @@ void flush_dcache_all(void)
> >>   {
> >>   }
> >>
> >> -void invalidate_dcache_range(unsigned long start, unsigned long stop)
> >> -{
> >> -}
> >> -
> >> -void flush_dcache_range(unsigned long start, unsigned long stop)
> >> -{
> >> -}
> >> -
> >>   void dcache_enable(void)
> >>   {
> >>   }
> > Are you sure about this change?
>
> This patch deletes those above empty functions so that the driver will
> use the same weak empty functions in arch/arm/lib/cache.c, which is
> added by this patch as well.
>
> > You are probably changing the wrong leg of the
> > #if conditional code.
>
> I don't think so. Could give me more details about this? Thanks.
>
> Best Regards,
> Josh Wu
>
> >
> > York
>