linux-kernel - Re: __kernel_suseconds_t is int on PA-RISC (and SPARC64)?

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Date:	Tue, 26 Aug 2008 22:24:18 +0200
From:	Helge Deller <deller@....de>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
CC:	linux-parisc@...r.kernel.org,
	Linux/m68k <linux-m68k@...r.kernel.org>,
	Linux Kernel Development <linux-kernel@...r.kernel.org>
Subject: Re: __kernel_suseconds_t is int on PA-RISC (and SPARC64)?

Geert Uytterhoeven wrote:
> Apparently __kernel_suseconds_t is `int' on PA-RISC (and on SPARC64),
> while it's `long' on all other platforms.
> 
> Is there a specific reason for that?

I don't know for sure, but arch/parisc/kernel/syscall_table.S states:
/* even though manpage says struct timeval contains longs, ours has
  * time_t and suseconds_t -- both of which are safe wide/narrow */
    ENTRY_COMP(setitimer)

So it was probably chosen to be int so that it can be easily used in 32- 
and 64bit kernels (or compat code).

Helge


> This causes compiler warnings in the HP SDC Real Time Clock driver,
> which is shared between PA-RISC and m68k:
> 
> drivers/input/misc/hp_sdc_rtc.c:461: warning: format '%02d' expects type 'int', but argument 4 has type 'long int'
> drivers/input/misc/hp_sdc_rtc.c:461: warning: format '%02d' expects type 'int', but argument 4 has type 'long int'
> drivers/input/misc/hp_sdc_rtc.c:468: warning: format '%02d' expects type 'int', but argument 4 has type 'long int'
> drivers/input/misc/hp_sdc_rtc.c:468: warning: format '%02d' expects type 'int', but argument 4 has type 'long int'
> drivers/input/misc/hp_sdc_rtc.c:475: warning: format '%02d' expects type 'int', but argument 4 has type 'long int'
> drivers/input/misc/hp_sdc_rtc.c:475: warning: format '%02d' expects type 'int', but argument 4 has type 'long int'
> drivers/input/misc/hp_sdc_rtc.c:482: warning: format '%02d' expects type 'int', but argument 4 has type 'long int'
> drivers/input/misc/hp_sdc_rtc.c:482: warning: format '%02d' expects type 'int', but argument 4 has type 'long int'
> drivers/input/misc/hp_sdc_rtc.c:489: warning: format '%02d' expects type 'int', but argument 4 has type 'long int'
> drivers/input/misc/hp_sdc_rtc.c:489: warning: format '%02d' expects type 'int', but argument 4 has type 'long int'
> 
> Gr{oetje,eeting}s,
> 
> 						Geert
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