linux-kernel - Re: [PATCH v2 21/31] arm64: 32-bit (compat) applications support

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Message-ID: <20120821102811.GA22126@elf.ucw.cz>
Date:	Tue, 21 Aug 2012 12:28:11 +0200
From:	Pavel Machek <pavel@....cz>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Catalin Marinas <catalin.marinas@....com>,
	linux-arch@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, Will Deacon <will.deacon@....com>
Subject: Re: [PATCH v2 21/31] arm64: 32-bit (compat) applications support

On Mon 2012-08-20 20:34:54, Arnd Bergmann wrote:
> On Monday 20 August 2012, Pavel Machek wrote:
> > > This patch adds support for 32-bit applications. The vectors page is a
> > > binary blob mapped into the application user space at 0xffff0000 (the
> > > AArch64 toolchain does not support compilation of AArch32 code). Full
> > > compatibility with ARMv7 user space is supported. The use of deprecated
> > > ARMv7 functionality (SWP, CP15 barriers) has been disabled by default on
> > > AArch64 kernels and unaligned LDM/STM is not supported.
> > > 
> > > Please note that only the ARM 32-bit EABI is supported, so no OABI
> > > compatibility.
> > 
> > > +struct compat_statfs {
> > > +     int             f_type;
> > > +     int             f_bsize;
> > > +     int             f_blocks;
> > > +     int             f_bfree;
> > > +     int             f_bavail;
> > > +     int             f_files;
> > > +     int             f_ffree;
> > > +     compat_fsid_t   f_fsid;
> > > +     int             f_namelen;      /* SunOS ignores this field. */
> > 
> > I'm sure it does. But is it good comment?
> 
> Good catch. It seems that some of the other compat platforms (x86,
> sparc, powerpc) have the same thing. I guess the real solution would
> be to introduce an asm-generic/compat.h file that contains a bunch
> of those definitions, like
> 
> #ifndef compat_timespec
> struct compat_timespec {
>         compat_time_t   tv_sec;
>         s32             tv_nsec;
> };
> #endif
> 
> #ifndef compat_timeval
> struct compat_timeval {
>         compat_time_t   tv_sec;
>         s32             tv_usec;
> };
> #endif

Yes, I guess that would be very good.
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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