linux-kernel - Re: [PATCH 24/25] arm64:ilp32: add vdso-ilp32 and use for signal return

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Message-ID: <1554541.oDP7Ro5zB2@wuerfel>
Date:	Fri, 29 Apr 2016 19:30:19 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Catalin Marinas <catalin.marinas@....com>
Cc:	Yury Norov <ynorov@...iumnetworks.com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-arch@...r.kernel.org, linux-s390@...r.kernel.org,
	pinskia@...il.com, Prasun.Kapoor@...iumnetworks.com,
	schwab@...e.de, broonie@...nel.org, linux-doc@...r.kernel.org,
	heiko.carstens@...ibm.com, agraf@...e.de, klimov.linux@...il.com,
	bamvor.zhangjian@...wei.com, schwidefsky@...ibm.com,
	Nathan_Lynch@...tor.com,
	Philipp Tomsich <philipp.tomsich@...obroma-systems.com>,
	joseph@...esourcery.com, christoph.muellner@...obroma-systems.com
Subject: Re: [PATCH 24/25] arm64:ilp32: add vdso-ilp32 and use for signal return

On Friday 29 April 2016 17:01:55 Catalin Marinas wrote:
> On Wed, Apr 06, 2016 at 01:08:46AM +0300, Yury Norov wrote:
> > ILP32 VDSO exports next symbols:
> >  __kernel_rt_sigreturn;
> >  __kernel_gettimeofday;
> >  __kernel_clock_gettime;
> >  __kernel_clock_getres;
> 
> [...]
> 
> > +$(obj)/gettimeofday-ilp32.o: $(src)/../vdso/gettimeofday.S
> > +	$(call if_changed_dep,vdso-ilp32as)
> 
> Are struct timeval and timespec the same between ILP32 and LP64? For
> example, __kernel_gettimeofday() assumes TVAL_TV_SEC offset defined in
> asm-offsets.c based on the LP64 timeval.

No, ilp32 uses the generic 32-bit data structures, which have a 32-bit
time_t. I guess that means it can work for little-endian but not
big-endian, right?

	Arnd