linux-kernel - Re: [PATCH 18/98] include/uapi/sound/emu10k1.h: added EMU10K1 version of DECLARE

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Date:	Sun, 31 May 2015 10:12:07 +0200
From:	Takashi Iwai <tiwai@...e.de>
To:	Mikko Rapeli <mikko.rapeli@....fi>
Cc:	linux-kernel@...r.kernel.org, Jaroslav Kysela <perex@...ex.cz>,
	alsa-devel@...a-project.org, linux-api@...r.kernel.org
Subject: Re: [PATCH 18/98] include/uapi/sound/emu10k1.h: added EMU10K1 version of DECLARE_BITMAP etc macros

At Sun, 31 May 2015 09:18:57 +0200,
Takashi Iwai wrote:
> 
> At Sat, 30 May 2015 17:38:10 +0200,
> Mikko Rapeli wrote:
> > 
> > Fixes userspace compilation error:
> > 
> > error: expected specifier-qualifier-list before ‘DECLARE_BITMAP’
> >   DECLARE_BITMAP(gpr_valid, 0x200); /* bitmask of valid initializers */
> > 
> > DECLARE_BITMAP etc macros are not meant for userspace headers and thus
> > added here as private copies for emu10k.h.
> > 
> > Fix was suggested by Arnd Bergmann <arnd@...db.de> in message
> > <2168807.4Yxh5gl11Q@...rfel> on lkml.
> > 
> > Signed-off-by: Mikko Rapeli <mikko.rapeli@....fi>
> > ---
> >  include/uapi/sound/emu10k1.h | 23 ++++++++++++++++++++---
> >  1 file changed, 20 insertions(+), 3 deletions(-)
> > 
> > diff --git a/include/uapi/sound/emu10k1.h b/include/uapi/sound/emu10k1.h
> > index ec1535b..7575f0f 100644
> > --- a/include/uapi/sound/emu10k1.h
> > +++ b/include/uapi/sound/emu10k1.h
> > @@ -34,6 +34,23 @@
> >  
> >  #define EMU10K1_FX8010_PCM_COUNT		8
> >  
> > +/*
> > + * Following definitions are copies from kernel headers to support compiling
> > + * this header file in userspace. The definitions are not generally available
> > + * in uapi headers so the needed things are copied here wtih __EMU10k1 prefix.
> > + */
> > +
> > +/* From include/linux/bitops.h */
> > +#define __EMU10K1_BITS_PER_BYTE           8
> > +/* From include/linux/kernel.h */
> > +#define __EMU10K1_DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
> > +/* From include/linux/bitops.h */
> > +#define __EMU10K1_BITS_TO_LONGS(nr) \
> > +        __EMU10K1_DIV_ROUND_UP(nr, __EMU10K1_BITS_PER_BYTE * sizeof(long))
> > +/* From include/linux/types.h */
> > +#define __EMU10K1_DECLARE_BITMAP(name,bits) \
> > +        unsigned long name[__EMU10K1_BITS_TO_LONGS(bits)]
> 
> This is way too complicated just for a few expansion of the aligned
> size arrays, IMO.  Rather simplify it like below with a comment:
> 
> /* the array must be aligned to unsigned long (i.e. 4 or 8 bytes) */
> #define __EMU10K1_DECLARE_BITMAP(name) \
> 	unsigned long name[(bits) / sizeof(unsigned long)]

Crap, of course, it must be multiplied with 8.

/* the array must be aligned to unsigned long (i.e. 32 or 64) */
#define __EMU10K1_DECLARE_BITMAP(name) \
	unsigned long name[(bits) / (sizeof(unsigned long) * 8)]


Takashi
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