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

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Message-ID: <s5h8uc58ba6.wl-tiwai@suse.de>
Date:	Sun, 31 May 2015 09:18:57 +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 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)]
	
or expand as is at each place like:
	unsigned long gpr_valid[0x200 / sizeof(unsigned long)];


thanks,

Takashi

>  /* instruction set */
>  #define iMAC0	 0x00	/* R = A + (X * Y >> 31)   ; saturation */
>  #define iMAC1	 0x01	/* R = A + (-X * Y >> 31)  ; saturation */
> @@ -300,7 +317,7 @@ struct snd_emu10k1_fx8010_control_old_gpr {
>  struct snd_emu10k1_fx8010_code {
>  	char name[128];
>  
> -	DECLARE_BITMAP(gpr_valid, 0x200); /* bitmask of valid initializers */
> +	__EMU10K1_DECLARE_BITMAP(gpr_valid, 0x200); /* bitmask of valid initializers */
>  	__u32 __user *gpr_map;		/* initializers */
>  
>  	unsigned int gpr_add_control_count; /* count of GPR controls to add/replace */
> @@ -313,11 +330,11 @@ struct snd_emu10k1_fx8010_code {
>  	unsigned int gpr_list_control_total; /* total count of GPR controls */
>  	struct snd_emu10k1_fx8010_control_gpr __user *gpr_list_controls; /* listed GPR controls */
>  
> -	DECLARE_BITMAP(tram_valid, 0x100); /* bitmask of valid initializers */
> +	__EMU10K1_DECLARE_BITMAP(tram_valid, 0x100); /* bitmask of valid initializers */
>  	__u32 __user *tram_data_map;	  /* data initializers */
>  	__u32 __user *tram_addr_map;	  /* map initializers */
>  
> -	DECLARE_BITMAP(code_valid, 1024); /* bitmask of valid instructions */
> +	__EMU10K1_DECLARE_BITMAP(code_valid, 1024); /* bitmask of valid instructions */
>  	__u32 __user *code;		  /* one instruction - 64 bits */
>  };
>  
> -- 
> 2.1.4
> 
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