linux-kernel - RE: [PATCH 1/2] ALSA: Kconfig: add config menu for reduced memory footprint

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Date:	Tue, 26 May 2015 12:32:43 +0000
From:	"Jie, Yang" <yang.jie@...el.com>
To:	Takashi Iwai <tiwai@...e.de>
CC:	"broonie@...nel.org" <broonie@...nel.org>,
	"alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Girdwood, Liam R" <liam.r.girdwood@...el.com>,
	"Zhang, Vivian" <vivian.zhang@...el.com>
Subject: RE: [PATCH 1/2] ALSA: Kconfig: add config menu for reduced memory
 footprint

> -----Original Message-----
> From: Takashi Iwai [mailto:tiwai@...e.de]
> Sent: Tuesday, May 26, 2015 7:05 PM
> To: Jie, Yang
> Cc: broonie@...nel.org; alsa-devel@...a-project.org; linux-
> kernel@...r.kernel.org; Girdwood, Liam R; Zhang, Vivian
> Subject: Re: [PATCH 1/2] ALSA: Kconfig: add config menu for reduced
> memory footprint
> 
> At Tue, 26 May 2015 19:04:24 +0800,
> Jie Yang wrote:
> >
> > For some embedded devices, we need reduce code size and data footprint
> > as much as possible, e.g. disabling procfs, hw/sw params refinement,
> > mmap, dpcm, dapm, compressed API...
> >
> > Here add root config menu for those configuration, and disable procfs
> > once reduced memory footprint is selected.
> >
> > Signed-off-by: Jie Yang <yang.jie@...el.com>
> > ---
> >  sound/Kconfig | 16 ++++++++++++++++
> >  1 file changed, 16 insertions(+)
> >
> > diff --git a/sound/Kconfig b/sound/Kconfig index 5a240e0..6760dfa
> > 100644
> > --- a/sound/Kconfig
> > +++ b/sound/Kconfig
> > @@ -68,6 +68,22 @@ menuconfig SND
> >
> >  if SND
> >
> > +menuconfig SND_REDUCED_MEMORY_FOOTPRINT
> > +	bool "Reduced Memory Footprint Support"
> > +	default n
> > +	help
> > +	  Say 'Y' to enable Reduced Memory Footprint Support, which may
> > +	  reduce code size and data footprint as much as possible.
> 
> I'd like to move this into sound/core.
> Also, the kconfig name appears a bit too lengthy to me.
> 
> > +config SND_PROC_FS
> > +	bool "Sound Proc FS Support"
> > +	depends on PROC_FS && !SND_REDUCED_MEMORY_FOOTPRINT
> 
> This should be
> 	bool "Sound Proc FS Support"
> if !SND_REDUCED_MEMORY_FOOTPRINT
> 	depends on PROC_FS
> 
> In this way, this prompt would appear only when
> SND_REDUCED_MEMORY_FOOTPRINT is set, i.e. only for experts.
 
Takashi, I tested and found same for these two way, the prompt will
appear only when PROC_FS=y and SND_REDUCED_MEMORY_FOOTPRINT
is *not* set. BTW, seems here we should use without '!'?

 	bool "Sound Proc FS Support" if SND_REDUCED_MEMORY_FOOTPRINT
 	depends on PROC_FS

~Keyon
> 
> 
> thanks,
> 
> Takashi
> 
> > +	default y
> > +	help
> > +	  Say 'N' to disable Sound proc FS, which may reduce code size about
> > +	  9KB on x86_64 platform.
> > +	  If unsure say Y.
> > +
> >  source "sound/core/Kconfig"
> >
> >  source "sound/drivers/Kconfig"
> > --
> > 1.9.1
> >
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