From mboxrd@z Thu Jan 1 00:00:00 1970 From: mlangsdo@redhat.com (Mark Langsdorf) Date: Thu, 09 Jul 2015 11:46:04 -0500 Subject: Build failure on ARM64 for Linux 4.2-rc1 was: Linux 4.2-rc1 In-Reply-To: <559BCC8A.1030708@redhat.com> References: <559BCC8A.1030708@redhat.com> Message-ID: <559EA54C.4060807@redhat.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On 07/07/2015 07:56 AM, Mark Langsdorf wrote: > On 07/05/2015 03:22 PM, Linus Torvalds wrote: >> It's Sunday, two weeks have passed, and the merge window is closed. I >> just pushed out the tag to the git trees, and tar-balls and patches >> should be mirroring out too. > > I'm seeing a build regression on arm64 for tools/perf. > > On linux-4.1, it builds fine. > > On linux-4.2-rc1, it dies with this relevant message (skipping the > missing defines, etc): > > /home/mlangsdorf/tmp/linux-4.2/include/linux/preempt.h: At top level: > /home/mlangsdorf/tmp/linux-4.2/include/linux/preempt.h:64:25: fatal > error: asm/preempt.h: No such file or directory > #include > > On both versions, arch/arm64/include/generated/asm/preempt.h > exists. I'm guessing something changed in the build system so > that's its not being picked up for 4.2-rc1 but I'm not sure where > to look. Hi Peter, I did a git bisect and it looks like the faulty patch is d72da4a4d973d8a0a0d3c97e7cdebf287fbe3a99, "rbtree: Make lockless searches non-fatal". I can't see why it causes my builds to fail, but if I revert that patch and the related series, then I can build the kernel and build tools/perf successfully. Any insight into a less intensive way of fixing my build would be appreciated. --Mark Langsdorf