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    SubjectRe: v4.4.12-rt20 build: 0 failures 5 warnings (v4.4.12-rt20)
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    On Friday, July 15, 2016 5:25:17 AM CEST Build bot for Mark Brown wrote:
    > Tree/Branch: v4.4.12-rt20
    > Git describe: v4.4.12-rt20
    > Commit: b4059f165a Linux 4.4.12-rt20
    >
    > Build Time: 79 min 2 sec
    >
    > Passed: 9 / 9 (100.00 %)
    > Failed: 0 / 9 ( 0.00 %)
    >
    > Errors: 0
    > Warnings: 5
    > Section Mismatches: 0
    >
    > -------------------------------------------------------------------------------
    > defconfigs with issues (other than build errors):
    > 1 warnings 0 mismatches : arm64-allnoconfig
    > 2 warnings 0 mismatches : arm64-allmodconfig
    > 1 warnings 0 mismatches : arm-multi_v5_defconfig
    > 2 warnings 0 mismatches : arm-multi_v7_defconfig
    > 1 warnings 0 mismatches : x86_64-defconfig
    > 3 warnings 0 mismatches : arm-allmodconfig
    > 1 warnings 0 mismatches : arm-allnoconfig
    > 1 warnings 0 mismatches : x86_64-allnoconfig
    > 2 warnings 0 mismatches : arm64-defconfig
    >
    > -------------------------------------------------------------------------------

    Cc linux-rt-users@vger.kernel.org, let's have a look at the individual warnings:

    > Warnings Summary: 5
    > 9 ../kernel/sched/core.c:3473:12: warning: 'preemptible_lazy' defined but not used [-Wunused-function]

    This was introduced by the rt patchset, I'd suggest adding a fix to the next
    v4.4-rt release. This is almost certainly harmless.

    > 2 ../include/linux/spinlock.h:246:3: warning: 'flags' may be used uninitialized in this function [-Wmaybe-uninitialized]

    I'm missing context here, so I don't know what caused it, but the warning is
    not present in v4.4.12 (without -rt), so it's worth looking into.

    It happens for both arm-multi_v7_defconfig and arm64-defconfig.

    > 1 ../lib/lz4/lz4hc_compress.c:514:1: warning: the frame size of 1472 bytes is larger than 1024 bytes [-Wframe-larger-than=]
    > 1 ../drivers/xen/balloon.c:155:13: warning: 'release_memory_resource' declared 'static' but never defined [-Wunused-function]
    > 1 ../drivers/mtd/chips/cfi_cmdset_0020.c:651:1: warning: the frame size of 1032 bytes is larger than 1024 bytes [-Wframe-larger-than=]

    These three are present in v4.4.12 and only got fixed upstream later.
    I have some hope that the fixes will make it into stable kernels
    eventually. The "frame size" warnings are a side-effect of a gcc
    problem with gcov profiling, and the xen warning was introduced by
    a stable backport patch.

    Arnd

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