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    SubjectRe: linux-next: build failure after merge of the final tree
    On Mon, Jan 09, 2012 at 05:20:16PM +1100, Stephen Rothwell wrote:
    > On Mon, 9 Jan 2012 16:59:50 +1100 Stephen Rothwell <sfr@canb.auug.org.au> wrote:
    > >
    > > On Thu, 5 Jan 2012 16:04:48 -0800 Andrew Morton <akpm@linux-foundation.org> wrote:
    > > >
    > > > On Thu, 5 Jan 2012 19:04:05 +1100
    > > > Stephen Rothwell <sfr@canb.auug.org.au> wrote:
    > > >
    > > > > After merging the final tree, today's linux-next build (sparc64 defconfig)
    > > > > failed like this:
    > > > >
    > > > > In file included from include/trace/ftrace.h:567:0,
    > > > > from include/trace/define_trace.h:86,
    > > > > from include/trace/events/power.h:240,
    > > > > from kernel/trace/power-traces.c:14:
    > > > > include/trace/events/kmem.h: In function 'ftrace_test_probe_kmalloc':
    > > > > include/trace/events/kmem.h:45:1: error: implicit declaration of function 'check_trace_callback_type_kmalloc' [-Werror=implicit-function-declaration]
    > > > > include/trace/events/kmem.h: In function 'ftrace_test_probe_kmem_cache_alloc':
    > > > >
    > > > > ...
    > > > >
    > > > > include/trace/events/kmem.h:267:1: error: implicit declaration of function 'check_trace_callback_type_mm_page_alloc_extfrag' [-Werror=implicit-function-declaration]
    > > > > In file included from include/trace/ftrace.h:774:0,
    > > > > from include/trace/define_trace.h:86,
    > > > > from include/trace/events/power.h:240,
    > > > > from kernel/trace/power-traces.c:14:
    > > > > include/trace/events/kmem.h: In function 'perf_test_probe_mm_page_pcpu_drain':
    > > > > include/trace/events/kmem.h:256:1: error: implicit declaration of function 'check_trace_callback_type_mm_page_pcpu_drain' [-Werror=implicit-function-declaration]
    > > > >
    > > > > I have no idea what has gone wrong here, but I did not get this error
    > > > > yesterday. The only thing that touched include/trace/events/kmem.h is
    > > > > patch "mm-tracepoint: rename page-free events" from the akpm tree, but
    > > > > that was there yesterday as well and doesn't look suspicious.
    > > >
    > > > Yes, it's not due to anything in the akpm tree. Tracing stuff blew up.
    > > >
    > > > > I just have to leave things broken for today in the hope that someone
    > > > > figures something out. This does not affect my X86_64 allmodconfig build
    > > > > or my PowerPC builds (including an allyesconfig build).
    > > >
    > > > It fails with sparc64 defconfig but succeeds with sparc64 allmodconfig.
    > > > Some config-dependent thing. 3.2 is OK, so it's something in -next.
    > > >
    > > > It could be that some far-off sparc64 Kconfig change is newly
    > > > triggering this.
    > > >
    > > > I suppose I could get off my ass and actually work out why it broke,
    > > > but the tracing code is too icky.
    > >
    > > This failure is now in Linus' tree. I am not sure when it got there.
    >
    > Bisected down to:
    >
    > 8a25a2fd126c621f44f3aeaef80d51f00fc11639 is the first bad commit
    > commit 8a25a2fd126c621f44f3aeaef80d51f00fc11639
    > Author: Kay Sievers <kay.sievers@vrfy.org>
    > Date: Wed Dec 21 14:29:42 2011 -0800
    >
    > cpu: convert 'cpu' and 'machinecheck' sysdev_class to a regular subsystem

    How is this triggering this build problem? I didn't see this happen
    before, and it wasn't showing up in linux-next in the past, right?

    This patch has nothing to to with tracing, perhaps it is an #include
    file problem? Or is the build error a different one (remember the
    -Werror problem in linux-next that I fixed up for PPC?)

    confused,

    greg k-h


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