LKML Archive on
 help / color / Atom feed
From: Richard Weinberger <>
Cc:,,,,,,,,, Richard Weinberger <>,
	Al Viro <>
Subject: [PATCH] Make COMPILE_TEST depend on !UML
Date: Fri, 17 Jun 2016 10:43:15 +0200
Message-ID: <> (raw)

UML is a bit special since it does not have iomem nor dma.
That means a lot of drivers will not build if they miss a
dependency on HAS_IOMEM. s390 used to have the same issues
but since it gained PCI support UML is the only stranger.

We are tired of patching dozens of new drivers after every
merge window just to un-break allmod/yesconfig UML builds.
One could argue that a decent driver has to know on what
it depends and therefore a missing HAS_IOMEM dependency is
a clear driver bug. But the dependency not obvious and not
everyone does UML builds with COMPILE_TEST enabled when
developing a device driver.

A possible solution to make these builds succeed on UML
would be providing stub functions for ioremap() and friends
which fail upon runtime. Another one is simply disabling
COMPILE_TEST for UML. Since it is the least hassle and does
not force use to fake iomem support let's do the latter.

Cc: Al Viro <>
Acked-by: Arnd Bergmann <>
Signed-off-by: Richard Weinberger <>
 init/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/init/Kconfig b/init/Kconfig
index f755a60..eae1808 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -55,6 +55,7 @@ config CROSS_COMPILE
 	bool "Compile also drivers which will not load"
+	depends on !UML
 	default n
 	  Some drivers can be compiled on a different platform than they are

                 reply index

Thread overview: [no followups] expand[flat|nested]  mbox.gz  Atom feed

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \ \ \ \ \ \ \ \ \ \ \ \ \ \

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

LKML Archive on

Archives are clonable:
	git clone --mirror lkml/git/0.git
	git clone --mirror lkml/git/1.git
	git clone --mirror lkml/git/2.git
	git clone --mirror lkml/git/3.git
	git clone --mirror lkml/git/4.git
	git clone --mirror lkml/git/5.git
	git clone --mirror lkml/git/6.git
	git clone --mirror lkml/git/7.git
	git clone --mirror lkml/git/8.git
	git clone --mirror lkml/git/9.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 lkml lkml/ \
	public-inbox-index lkml

Example config snippet for mirrors

Newsgroup available over NNTP:

AGPL code for this site: git clone