Re: linux-next: build failure after merge of the origin tree

On Wed, 10 Oct 2012 10:21:50 +1100 Stephen Rothwell [off-list ref] wrote:

Hi Linus,

In Linus' tree, today's linux-next build (powerpc ppc64_defconfig) failed
like this:

arch/powerpc/platforms/pseries/hotplug-memory.c: In function 'pseries_remove_memblock':
arch/powerpc/platforms/pseries/hotplug-memory.c:103:17: error: unused variable 'pfn' [-Werror=unused-variable]

Caused by commit d760afd4d257 ("memory-hotplug: suppress "Trying to free
nonexistent resource <XXXXXXXXXXXXXXXX-YYYYYYYYYYYYYYYY>" warning").

I can't see what the point of the "pfn" variable is

This:

--- a/arch/powerpc/platforms/pseries/hotplug-memory.c~a
+++ a/arch/powerpc/platforms/pseries/hotplug-memory.c

@@ -101,7 +101,7 @@ static int pseries_remove_memblock(unsig
 	sections_to_remove = (memblock_size >> PAGE_SHIFT) / PAGES_PER_SECTION;
 	for (i = 0; i < sections_to_remove; i++) {
 		unsigned long pfn = start_pfn + i * PAGES_PER_SECTION;
-		ret = __remove_pages(zone, start_pfn,  PAGES_PER_SECTION);
+		ret = __remove_pages(zone, pfn, PAGES_PER_SECTION);
 		if (ret)
 			return ret;
 	}

and this patch never
appeared in linux-next before being merged.  :-(

It was first sighted October 3.

I have reverted that commit for today.

If this patch truly was authored yesterday (according the Author Date in
git), why was it merged yesterday while still under discussion?  And the
latest update to it still has this build problem ... did anyone even try
to build this for powerpc (since that architecture was obviously
affected)?

Apparently not - the ppc bit was a best-effort fixup for a patch which
addresses an x86 problem.