RE: linux-next: build failure after merge of the staging tree

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> From: Greg KH [mailto:greg@xxxxxxxxx]
> Subject: Re: linux-next: build failure after merge of the staging tree
> 
> On Fri, Feb 10, 2012 at 03:58:00PM +1100, Stephen Rothwell wrote:
> > Hi Greg,
> >
> > After merging the staging tree, today's linux-next build (x86_64
> > allmodconfig) failed like this:
> >
> > drivers/staging/ramster/ramster_o2net.c: In function 'ramster_remote_async_get_request_handler':
> > drivers/staging/ramster/ramster_o2net.c:91:2: error: implicit declaration of function
> 'o2net_force_data_magic' [-Werror=implicit-function-declaration]
> > drivers/staging/ramster/ramster_o2net.c: In function 'ramster_remote_put':
> > drivers/staging/ramster/ramster_o2net.c:250:2: error: implicit declaration of function
> 'o2net_nn_from_num' [-Werror=implicit-function-declaration]
> > drivers/staging/ramster/zcache-main.c:40:64: fatal error: ../zram/xvmalloc.h: No such file or
> directory
> >
> > Caused by commits ba351b02ab11 ("staging: ramster: local compression +
> > tmem") and 14a3cd58dd4f ("staging: ramster: ramster-specific new files").
> >
> > I have used the version of the staging tree from next-20120209 for today.
> 
> Ugh, I wonder why it builds here, very odd.
> 
> Dan, care to send me a patch to fix this?

> > drivers/staging/ramster/zcache-main.c:40:64: fatal error: ../zram/xvmalloc.h: No such

Hmmm... it appears that Seth's zsmalloc patch for drivers/staging/zcache
removed xvmalloc.[ch] from drivers/staging/zram while drivers/staging/ramster
is still depending on it. :-(  I hadn't planned for both ramster
and zsmalloc-replacing-xvmalloc to be merged at the same time... I guess
this is exactly the kind of problem linux-next is designed to wring out!

Greg, FOR NOW, PLEASE JUST REVERT the ramster patchset from staging-next.
I am working on a v5 anyway and will roll in a copy of the xvmalloc.[ch]
code into it for now and, since Seth's patch should be in linux-next
by the time I am done (hopefully next week), I can test build ramster v5
with linux-next to ensure all the above problems are resolved before
resubmitting.

(Seth, I could also switch ramster v5 to depend on zsmalloc instead of
xvmalloc, but since I've done all my ramster testing on xvmalloc,
I think I would prefer to make that transition later.)

Sorry, Stephen and Greg, for the hassle!
Dan
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