linux-kernel - Re: [PATCH] arm64: fix /proc/cpuinfo for elf32

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Message-ID: <678F3D1BB717D949B966B68EAEB446ED0A6E6F56@SZXEMA509-MBX.china.huawei.com>
Date:	Tue, 26 Apr 2016 02:07:56 +0000
From:	"Zengtao (B)" <prime.zeng@...ilicon.com>
To:	"catalin.marinas@....com" <catalin.marinas@....com>
CC:	"Zengtao (B)" <prime.zeng@...ilicon.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"mark.rutland@....com" <mark.rutland@....com>,
	"suzuki.poulose@....com" <suzuki.poulose@....com>,
	"will.deacon@....com" <will.deacon@....com>,
	"james.morse@....com" <james.morse@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"yang.shi@...aro.org" <yang.shi@...aro.org>
Subject: Re: [PATCH] arm64: fix /proc/cpuinfo for elf32

On 2016-04-25 09:12, Catalin Marinas wrote:
> On Mon, Apr 25, 2016 at 11:37:33AM +0800, Zeng Tao wrote:
> > For elf32 thread, personality is used for arm32,
> > and thread_flag for arm64.
> > 
> > Here personality is used for arm64, so fix it.
> > 
> > Signed-off-by: Zeng Tao <prime.zeng@...wei.com>
> > ---
> >  arch/arm64/kernel/cpuinfo.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> 
> We discussed this some time ago and we decided against it. One reason
> was scripts where you may or may not end up with the desired cpuinfo
> (e.g. grep being 64-bit invoked by a 32-bit bash). The personality at
> least is inherited by child processes.
> 
So you mean the 64-bit grep should see the same cpuinfo as 32-bit bash as 
It is the child process?
But currently we have same 32-bit application which don't have their
personality set, so they get the wrong cpuinfo. 
How to fix, call the personality syscall?  

> -- 
> Catalin
> 
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
> 
>

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