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