[PATCH] staging: drop kbuild workaround dummy module from top dir

[PATCH] staging: drop kbuild workaround dummy module from top dir

[Paul Gortmaker]

This is essentially a revert of 86f69fe9c069dd8608d238581eea259caa1dfc99
("Staging: workaround build system bug"), but to call it a revert would
imply it was wrong -- rather it seems more like it is just no longer
required anymore.

It doesn't list the full details of the failing use case, but the most
obvious would appear to be a "make allnoconfig" that subsequently had set
just CONFIG_STAGING=y in the .config file, to give:

  paul@builder:~/git/linux-head$ grep STAGING ../staging-allno/.config
  CONFIG_STAGING=y
  # CONFIG_STAGING_MEDIA is not set
  # CONFIG_STAGING_BOARD is not set
  paul@builder:~/git/linux-head$

After building this .config (on ARM, just to be different), we see that
built-in.o is created, and the final vmlinux links OK:

  paul@builder:~/git/linux-head$ ls -l ../staging-allno/drivers/staging/built-in.o
  -rw-rw-r-- 1 paul paul 257 Nov 16 18:06 ../staging-allno/drivers/staging/built-in.o
  paul@builder:~/git/linux-head$ file ../staging-allno/drivers/staging/built-in.o
  ../staging-allno/drivers/staging/built-in.o: ELF 32-bit LSB relocatable, ARM, version 1, not stripped
  paul@builder:~/git/linux-head$ nm ../staging-allno/drivers/staging/built-in.o
  nm: ../staging-allno/drivers/staging/built-in.o: no symbols
  paul@builder:~/git/linux-head$ ls -l ../staging-allno/vmlinux
  -rwxrwxr-x 1 paul paul 1236326 Nov 16 18:07 ../staging-allno/vmlinux
  paul@builder:~/git/linux-head$

I also tested an "allmodconfig" and did not see any problems there
either.  Switching back to x86-64 and testing several things there didn't
show any issues either.  So it appears we do not need to carry the
workaround in tree any longer.

Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Michal Marek <mmarek@suse.com>
Cc: linux-kbuild@vger.kernel.org
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

diff --git a/drivers/staging/Makefile b/drivers/staging/Makefile
index 30918edef5e3..f666937739fb 100644
--- a/drivers/staging/Makefile
+++ b/drivers/staging/Makefile
@@ -1,8 +1,5 @@
 # Makefile for staging directory
 
-# fix for build system bug...
-obj-$(CONFIG_STAGING)		+= staging.o
-
 obj-y				+= media/
 obj-$(CONFIG_SLICOSS)		+= slicoss/
 obj-$(CONFIG_PRISM2_USB)	+= wlan-ng/
diff --git a/drivers/staging/staging.c b/drivers/staging/staging.c
deleted file mode 100644
index 233e589c0932..000000000000
--- a/drivers/staging/staging.c
+++ /dev/null
@@ -1,19 +0,0 @@
-#include <linux/kernel.h>
-#include <linux/init.h>
-#include <linux/module.h>
-
-static int __init staging_init(void)
-{
-	return 0;
-}
-
-static void __exit staging_exit(void)
-{
-}
-
-module_init(staging_init);
-module_exit(staging_exit);
-
-MODULE_AUTHOR("Greg Kroah-Hartman");
-MODULE_DESCRIPTION("Staging Core");
-MODULE_LICENSE("GPL");
-- 
1.8.2.3

Re: [PATCH] staging: drop kbuild workaround dummy module from top dir

[Michal Marek]

Dne 17.11.2015 v 01:58 Paul Gortmaker napsal(a):
> This is essentially a revert of 86f69fe9c069dd8608d238581eea259caa1dfc99
> ("Staging: workaround build system bug"), but to call it a revert would
> imply it was wrong -- rather it seems more like it is just no longer
> required anymore.

Acked-by: Michal Marek <mmarek@suse.com>

In fact, I can't even reproduce the original bug with 2.6.27 + the
initial staging series. I also do not remember any fix for such bug in
the recent years. 4b024242e8a4 ("kbuild: Fix linking error built-in.o no
such file or directory") is related, but fixing a different problem.

Michal

Re: [PATCH] staging: drop kbuild workaround dummy module from top dir

[Greg Kroah-Hartman]

On Wed, Nov 18, 2015 at 06:45:11PM +0100, Michal Marek wrote:
> Dne 17.11.2015 v 01:58 Paul Gortmaker napsal(a):
> > This is essentially a revert of 86f69fe9c069dd8608d238581eea259caa1dfc99
> > ("Staging: workaround build system bug"), but to call it a revert would
> > imply it was wrong -- rather it seems more like it is just no longer
> > required anymore.
> 
> Acked-by: Michal Marek <mmarek@suse.com>
> 
> In fact, I can't even reproduce the original bug with 2.6.27 + the
> initial staging series. I also do not remember any fix for such bug in
> the recent years. 4b024242e8a4 ("kbuild: Fix linking error built-in.o no
> such file or directory") is related, but fixing a different problem.

I can't remember the issue at the moment either, but it was a problem
with some sort of config, I'll queue this up and see if anything breaks
:)

thanks,

greg k-h

Re: [PATCH] staging: drop kbuild workaround dummy module from top dir

[Paul Gortmaker]

[Re: [PATCH] staging: drop kbuild workaround dummy module from top dir] On 18/11/2015 (Wed 09:53) Greg Kroah-Hartman wrote:

> On Wed, Nov 18, 2015 at 06:45:11PM +0100, Michal Marek wrote:
> > Dne 17.11.2015 v 01:58 Paul Gortmaker napsal(a):
> > > This is essentially a revert of 86f69fe9c069dd8608d238581eea259caa1dfc99
> > > ("Staging: workaround build system bug"), but to call it a revert would
> > > imply it was wrong -- rather it seems more like it is just no longer
> > > required anymore.
> > 
> > Acked-by: Michal Marek <mmarek@suse.com>
> > 
> > In fact, I can't even reproduce the original bug with 2.6.27 + the
> > initial staging series. I also do not remember any fix for such bug in
> > the recent years. 4b024242e8a4 ("kbuild: Fix linking error built-in.o no
> > such file or directory") is related, but fixing a different problem.
> 
> I can't remember the issue at the moment either, but it was a problem
> with some sort of config, I'll queue this up and see if anything breaks
> :)

Did you detect any fallout?  Just wondering since I didn't see it loop
around in linux-next via staging #staging-next yet...

Thanks,
Paul.
--

> 
> thanks,
> 
> greg k-h

Re: [PATCH] staging: drop kbuild workaround dummy module from top dir

[Greg Kroah-Hartman]

On Wed, Dec 09, 2015 at 04:06:10PM -0500, Paul Gortmaker wrote:
> [Re: [PATCH] staging: drop kbuild workaround dummy module from top dir] On 18/11/2015 (Wed 09:53) Greg Kroah-Hartman wrote:
> 
> > On Wed, Nov 18, 2015 at 06:45:11PM +0100, Michal Marek wrote:
> > > Dne 17.11.2015 v 01:58 Paul Gortmaker napsal(a):
> > > > This is essentially a revert of 86f69fe9c069dd8608d238581eea259caa1dfc99
> > > > ("Staging: workaround build system bug"), but to call it a revert would
> > > > imply it was wrong -- rather it seems more like it is just no longer
> > > > required anymore.
> > > 
> > > Acked-by: Michal Marek <mmarek@suse.com>
> > > 
> > > In fact, I can't even reproduce the original bug with 2.6.27 + the
> > > initial staging series. I also do not remember any fix for such bug in
> > > the recent years. 4b024242e8a4 ("kbuild: Fix linking error built-in.o no
> > > such file or directory") is related, but fixing a different problem.
> > 
> > I can't remember the issue at the moment either, but it was a problem
> > with some sort of config, I'll queue this up and see if anything breaks
> > :)
> 
> Did you detect any fallout?  Just wondering since I didn't see it loop
> around in linux-next via staging #staging-next yet...

Sorry, it now just got applied, got way behind on patches :(