linux-kernel - Re: [PATCH v8 02/21] acpi: fix acpi_os

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Message-ID: <CAErSpo69LoS0P_bzJ2JJyF=H_YyJua85FCJ7DdMi2_na=aHRiA@mail.gmail.com>
Date:	Wed, 4 Feb 2015 10:41:11 -0600
From:	Bjorn Helgaas <bhelgaas@...gle.com>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Mark Salter <msalter@...hat.com>,
	Mark Rutland <mark.rutland@....com>,
	Mark Langsdorf <mlangsdo@...hat.com>,
	linaro-acpi@...ts.linaro.org,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	Yijing Wang <wangyijing@...wei.com>,
	Rob Herring <robh@...nel.org>,
	Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
	Timur Tabi <timur@...eaurora.org>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	Grant Likely <grant.likely@...aro.org>,
	Charles Garcia-Tobin <Charles.Garcia-Tobin@....com>,
	phoenix.liyi@...wei.com, Robert Richter <rric@...nel.org>,
	Jason Cooper <jason@...edaemon.net>,
	Arnd Bergmann <arnd@...db.de>,
	Marc Zyngier <marc.zyngier@....com>,
	Jon Masters <jcm@...hat.com>, Mark Brown <broonie@...nel.org>,
	linux-arm <linux-arm-kernel@...ts.infradead.org>,
	Ashwin Chaugule <ashwinc@...eaurora.org>,
	Graeme Gregory <graeme.gregory@...aro.org>,
	Randy Dunlap <rdunlap@...radead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Hanjun Guo <hanjun.guo@...aro.org>,
	Suravee Suthikulpanit <suravee.suthikulpanit@....com>,
	Sudeep Holla <Sudeep.Holla@....com>,
	Olof Johansson <olof@...om.net>
Subject: Re: [PATCH v8 02/21] acpi: fix acpi_os_ioremap for arm64

On Wed, Feb 4, 2015 at 10:25 AM, Russell King - ARM Linux
<linux@....linux.org.uk> wrote:
> On Wed, Feb 04, 2015 at 09:53:28AM -0600, Bjorn Helgaas wrote:
>> On Wed, Feb 4, 2015 at 4:48 AM, Russell King - ARM Linux
>> <linux@....linux.org.uk> wrote:
>> > Moreover, __weak is positively harmful when you consider it adds bloat
>> > and dead code - the overriden __weak function is left behind in the
>> > resulting final image.
>>
>> Huh, I didn't realize that.  Is that a linker bug, or is there some
>> reason the weak function has to be in the final image?  I tried a
>> trivial test on x86 with gcc-4.8.2/ld-2.24, and I think the weak
>> function text was omitted, but a string constant used only by the weak
>> function was included.
> ...
> The reason this happens is because normally, each function text is
> emitted into the .text section of the object file, one after each
> other.  When the image is linked, the linker copies the contents of
> the complete input section to the output file, and then resolves the
> symbolic information and relocations.

OK, that makes sense.  Thanks a lot for the detailed explanation!
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