linux-kernel - Re: [PATCH V3 1/2] ACPI / EC: Fix broken big-endian 64bit platforms using 'global

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Message-ID: <2327281.tcr4Ty65Wu@vostro.rjw.lan>
Date:	Wed, 16 Sep 2015 04:06:07 +0200
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	Viresh Kumar <viresh.kumar@...aro.org>
Cc:	Lv Zheng <lv.zheng@...el.com>, gregkh@...uxfoundation.org,
	linaro-kernel@...ts.linaro.org, sboyd@...eaurora.org,
	arnd@...db.de, stable@...r.kernel.org, Len Brown <lenb@...nel.org>,
	"open list:ACPI" <linux-acpi@...r.kernel.org>,
	open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V3 1/2] ACPI / EC: Fix broken big-endian 64bit platforms using 'global_lock'

On Wednesday, September 16, 2015 03:57:05 AM Rafael J. Wysocki wrote:
> On Tuesday, September 15, 2015 02:04:58 PM Viresh Kumar wrote:
> > global_lock is defined as an unsigned long and accessing only its lower
> > 32 bits from sysfs is incorrect, as we need to consider other 32 bits
> > for big endian 64 bit systems.
> > 
> > Fix that by making global_lock an u32 instead.
> > 
> > Cc: <stable@...r.kernel.org>  # v4.1+
> > Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
> > 
> > ---
> > Its marked just for # v4.1+, because arm64 has the first 64 big-endian
> > platform with ACPI. And ACPI support for that is mainlined recently
> > only (Arnd Bergmann).
> 
> OK
> 
> So are you aware of any ARM platform implementing the ACPI EC?
> 
> I am not.  Moreover, I'm not aware of any plans in that area.

In any case, please just split the EC-related changes off from your second
patch and send them separately.

Thanks,
Rafael

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