linux-kernel - Re: [PATCH 13/23] arm64: introduce is_a32_task and is_a32

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Date:	Sun, 12 Jun 2016 20:56:44 +0300
From:	Yury Norov <ynorov@...iumnetworks.com>
To:	"Zhangjian (Bamvor)" <bamvor.zhangjian@...wei.com>
CC:	<arnd@...db.de>, <catalin.marinas@....com>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <linux-doc@...r.kernel.org>,
	<linux-arch@...r.kernel.org>, <linux-s390@...r.kernel.org>,
	<libc-alpha@...rceware.org>, <schwidefsky@...ibm.com>,
	<heiko.carstens@...ibm.com>, <pinskia@...il.com>,
	<broonie@...nel.org>, <joseph@...esourcery.com>,
	<christoph.muellner@...obroma-systems.com>,
	<szabolcs.nagy@....com>, <klimov.linux@...il.com>,
	<Nathan_Lynch@...tor.com>, <agraf@...e.de>,
	<Prasun.Kapoor@...iumnetworks.com>, <kilobyte@...band.pl>,
	<geert@...ux-m68k.org>, <philipp.tomsich@...obroma-systems.com>,
	Andrew Pinski <Andrew.Pinski@...iumnetworks.com>,
	Hanjun Guo <guohanjun@...wei.com>
Subject: Re: [PATCH 13/23] arm64: introduce is_a32_task and is_a32_thread
 (for AArch32 compat)

On Sun, Jun 12, 2016 at 09:08:28PM +0800, Zhangjian (Bamvor) wrote:
> >>  #ifdef CONFIG_COMPAT
> >>  #define TASK_SIZE_32        UL(0x100000000)
> >>-#define TASK_SIZE        (test_thread_flag(TIF_32BIT) ? \
> >>+#define TASK_SIZE        (is_compat_task() ?        \
> >>                  TASK_SIZE_32 : TASK_SIZE_64)
> >>  #define TASK_SIZE_OF(tsk)    (test_tsk_thread_flag(tsk, TIF_32BIT) ? \
> >>                  TASK_SIZE_32 : TASK_SIZE_64)
> >Should we update or delete this macro?
> >  #define TASK_SIZE_OF(tsk) (is_compat_task() ? \
> >TASK_SIZE_32 : TASK_SIZE_64)
> Sorry it should be:
> #define TASK_SIZE_OF(tsk)       ((is_a32_compat_thread(task_thread_info(tsk)) \
>                                   || is_ilp32_compat_thread(task_thread_info(tsk))) ? \
>                                 TASK_SIZE_32 : TASK_SIZE_64)

Thank you. I know about this, but always forget to fix. )
I think we'd introduce is_compat_thread() as well.

> >x86, sparc, mips, ppc, parisc, s390 define its own version. But
> >"include/linux/sched.h" will define it if
> >TASK_SIZE_OF does not exist:
> >#ifndef TASK_SIZE_OF
> >#define TASK_SIZE_OF(tsk)       TASK_SIZE
> >#endif
> >
> >
> >Regards
> >
> >Bamvor
> >