linux-kernel - Re: linux-next: build failure after merge of the akpm tree

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Date:	Mon, 25 Jan 2016 12:03:54 +0100
From:	Takashi Iwai <tiwai@...e.de>
To:	Sudip Mukherjee <sudipm.mukherjee@...il.com>
Cc:	Stephen Rothwell <sfr@...b.auug.org.au>,
	Mark Brown <broonie@...nel.org>,
	Vinod Koul <vinod.koul@...el.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-next@...r.kernel.org, linux-kernel@...r.kernel.org,
	Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
Subject: Re: linux-next: build failure after merge of the akpm tree

On Mon, 25 Jan 2016 11:45:56 +0100,
Sudip Mukherjee wrote:
> 
> On Mon, Jan 25, 2016 at 10:29:54AM +0100, Takashi Iwai wrote:
> > On Fri, 22 Jan 2016 03:40:45 +0100,
> > Stephen Rothwell wrote:
> > > 
> > > Hi all,
> > > 
> > > On Fri, 22 Jan 2016 11:24:42 +1100 Stephen Rothwell <sfr@...b.auug.org.au> wrote:
> > > >
> > > > On Thu, 21 Jan 2016 07:38:59 +1100 Stephen Rothwell <sfr@...b.auug.org.au> wrote:
> > > > >
> > > > > On Wed, 20 Jan 2016 15:09:47 +0100 Takashi Iwai <tiwai@...e.de> wrote:  
> > > > > >
> > > > > > On Sat, 16 Jan 2016 09:51:29 +0100,
> > > > > > Takashi Iwai wrote:    
> > > > > > > 
> > > > > > > There are a few ways to fix this, but all are not comfortable.
> > > > > > > 
> > > > > > > A. Disable compress API for powerpc.    
> > > > > 
> > > > > This also affects alpha, mips and (maybe) sparc.  
> > > > 
> > > > This was exposed on PowerPC by commit bf76f73c5f65 ("powerpc: enable
> > > > UBSAN support") which is in Linus' tree as of this morning.  The only
> > > > relevant change that made was in the compiler flags (I tested this by
> > > > building the file without that commit but with these new compiler flags:
> > > > 
> > > > -fsanitize=shift -fsanitize=integer-divide-by-zero
> > > > -fsanitize=unreachable -fsanitize=vla-bound -fsanitize=null
> > > > -fsanitize=signed-integer-overflow -fsanitize=bounds
> > > > -fsanitize=object-size -fsanitize=returns-nonnull-attribute
> > > > -fsanitize=bool -fsanitize=enum -fsanitize=alignment
> > > > 
> > > > The preprocessed file is the same in both cases, but with these flags
> > > > the compiler errors.
> > > 
> > > So for now I have suppressed the error using the following patch (which
> > > I will keep in my fixes tree until some other fix is applied):
> > > 
> > > From: Stephen Rothwell <sfr@...b.auug.org.au>
> > > Date: Fri, 22 Jan 2016 13:24:57 +1100
> > > Subject: [PATCH] next: suppress the building of all the sound codecs on PPC
> > >  for now
> > > 
> > > Signed-off-by: Stephen Rothwell <sfr@...b.auug.org.au>
> > > ---
> > >  sound/soc/codecs/Kconfig | 1 +
> > >  1 file changed, 1 insertion(+)
> > > 
> > > diff --git a/sound/soc/codecs/Kconfig b/sound/soc/codecs/Kconfig
> > > index 50693c867e71..ee5f36b9c787 100644
> > > --- a/sound/soc/codecs/Kconfig
> > > +++ b/sound/soc/codecs/Kconfig
> > > @@ -13,6 +13,7 @@ menu "CODEC drivers"
> > >  config SND_SOC_ALL_CODECS
> > >  	tristate "Build all ASoC CODEC drivers"
> > >  	depends on COMPILE_TEST
> > > +	depends on !PPC
> > >  	select SND_SOC_88PM860X if MFD_88PM860X
> > >  	select SND_SOC_L3
> > >  	select SND_SOC_AB8500_CODEC if ABX500_CORE
> > 
> > Suppressing this whole is an overreaction, IMO.  It should suffice
> > just to disable compile-testing Intel driver.
> > How about the patch below?
> > 
> > 
> > thanks,
> > 
> > Takashi
> > 
> > -- 8< --
> > From: Takashi Iwai <tiwai@...e.de>
> > Subject: [PATCH] ASoC: intel: suppress compile-test with PowerPC
> > 
> > Since some ioctl in compress offload API is broken for PPC (the struct
> > size overflows), now we get actually the build error.
> > 
> > Until we get the proper solution (e.g. alternative ioctl), let's
> > disable the build of Intel ASoC driver that is the only driver who
> > enables SND_SOC_COMPRESS (and eventually SND_COMPRESS_OFFLOAD) in the
> > mainline tree.
> 
> Sorry, but this does not fix the build failure.
> I can still see SND_COMPRESS_OFFLOAD=m in .config and the build fails.

Who sets this config?  SND_COMPRESS_OFFLOAD has no prompt, so this
should be default off.

> But the following does fix it for powerpc:
> 
> diff --git a/sound/soc/Kconfig b/sound/soc/Kconfig
> index 7ea66ee..b92d286 100644
> --- a/sound/soc/Kconfig
> +++ b/sound/soc/Kconfig
> @@ -31,6 +31,7 @@ config SND_SOC_GENERIC_DMAENGINE_PCM
>  
>  config SND_SOC_COMPRESS
>  	bool
> +	depends on !PPC
>  	select SND_COMPRESS_OFFLOAD
>  
>  config SND_SOC_TOPOLOGY

It has a reverse-selection, and the reverse-selection ignores Depends,
AFAIK.  If that long-standing problem were already fixed, it's
great...


Takashi

> 
> -- 
> 
> I will just check with alpha and see if that is also affected.
> 
> regards
> sudip
>