linux-kernel - Re: [PATCH v2] firmware: google: Properly state IOMEM dependency

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Date:   Fri, 25 Feb 2022 22:55:03 +0800
From:   David Gow <davidgow@...gle.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Julius Werner <jwerner@...omium.org>,
        Ben Hutchings <ben@...adent.org.uk>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-um <linux-um@...ts.infradead.org>,
        anton ivanov <anton.ivanov@...bridgegreys.com>
Subject: Re: [PATCH v2] firmware: google: Properly state IOMEM dependency

On Fri, Feb 25, 2022 at 6:47 PM Greg Kroah-Hartman
<gregkh@...uxfoundation.org> wrote:
>
> On Fri, Feb 25, 2022 at 12:15:02PM +0800, David Gow wrote:
> > The Google Coreboot implementation requires IOMEM functions
> > (memmremap, memunmap, devm_memremap), but does not specify this is its
> > Kconfig. This results in build errors when HAS_IOMEM is not set, such as
> > on some UML configurations:
> >
> > /usr/bin/ld: drivers/firmware/google/coreboot_table.o: in function `coreboot_table_probe':
> > coreboot_table.c:(.text+0x311): undefined reference to `memremap'
> > /usr/bin/ld: coreboot_table.c:(.text+0x34e): undefined reference to `memunmap'
> > /usr/bin/ld: drivers/firmware/google/memconsole-coreboot.o: in function `memconsole_probe':
> > memconsole-coreboot.c:(.text+0x12d): undefined reference to `memremap'
> > /usr/bin/ld: memconsole-coreboot.c:(.text+0x17e): undefined reference to `devm_memremap'
> > /usr/bin/ld: memconsole-coreboot.c:(.text+0x191): undefined reference to `memunmap'
> > /usr/bin/ld: drivers/firmware/google/vpd.o: in function `vpd_section_destroy.isra.0':
> > vpd.c:(.text+0x300): undefined reference to `memunmap'
> > /usr/bin/ld: drivers/firmware/google/vpd.o: in function `vpd_section_init':
> > vpd.c:(.text+0x382): undefined reference to `memremap'
> > /usr/bin/ld: vpd.c:(.text+0x459): undefined reference to `memunmap'
> > /usr/bin/ld: drivers/firmware/google/vpd.o: in function `vpd_probe':
> > vpd.c:(.text+0x59d): undefined reference to `memremap'
> > /usr/bin/ld: vpd.c:(.text+0x5d3): undefined reference to `memunmap'
> > collect2: error: ld returned 1 exit status
> >
> > Signed-off-by: David Gow <davidgow@...gle.com>
> > Acked-By: anton ivanov <anton.ivanov@...bridgegreys.com>
> > Acked-By: Julius Werner <jwerner@...omium.org>
> > ---
>
> What commit id does this fix?
>
> thanks,
>
> greg k-h

As best I can tell, this[1] is the most sensible answer:

Fixes: a28aad66da ("firmware: coreboot: Collapse platform drivers into
bus core")

However, I think the first actual HAS_IOMEM-dependent calls were
introduced earlier, in "firmware: google memconsole: Add coreboot
support"[2], it just (a) never caused a problem under UML due to the
ACPI requirement, and (b) this fix won't apply particularly cleanly to
anything earlier than [1] anyway.

-- David

[1]: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a28aad66da8bd19b249670d003bb9a698bdda397
[2]: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=d384d6f43d1ec3f1225ab0275fd592c5980bd830

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