linux-kernel - Re: [PATCH v3 1/3] vdso: Switch get/put unaligned from packed struct to memcpy

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Message-ID: <87o6tcrzh2.ffs@tglx>
Date: Tue, 22 Jul 2025 17:56:25 +0200
From: Thomas Gleixner <tglx@...utronix.de>
To: kernel test robot <lkp@...el.com>, Ian Rogers <irogers@...gle.com>, Eric
 Biggers <ebiggers@...gle.com>, Yuzhuo Jing <yuzhuo@...gle.com>, Andy
 Lutomirski <luto@...nel.org>, Vincenzo Frascino
 <vincenzo.frascino@....com>, Arnaldo Carvalho de Melo <acme@...hat.com>,
 Al Viro <viro@...iv.linux.org.uk>, Christophe Leroy
 <christophe.leroy@...roup.eu>, "Jason A. Donenfeld" <Jason@...c4.com>,
 linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org
Cc: llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev, Ian Rogers
 <irogers@...gle.com>
Subject: Re: [PATCH v3 1/3] vdso: Switch get/put unaligned from packed
 struct to memcpy

Ian!

On Sat, Jul 05 2025 at 08:05, kernel test robot wrote:
> kernel test robot noticed the following build warnings:
>
> [auto build test WARNING on linus/master]
> [also build test WARNING on tip/timers/vdso v6.16-rc4 next-20250704]
> [cannot apply to acme/perf/core]
> [If your patch is applied to the wrong git tree, kindly drop us a note.
> And when submitting patch, we suggest to use '--base' as documented in
> https://git-scm.com/docs/git-format-patch#_base_tree_information]
>
> url:    https://github.com/intel-lab-lkp/linux/commits/Ian-Rogers/vdso-Switch-get-put-unaligned-from-packed-struct-to-memcpy/20250626-135005
> base:   linus/master
> patch link:    https://lore.kernel.org/r/20250626054826.433453-2-irogers%40google.com
> patch subject: [PATCH v3 1/3] vdso: Switch get/put unaligned from packed struct to memcpy
> config: s390-randconfig-002-20250705 (https://download.01.org/0day-ci/archive/20250705/202507050736.b4hX0Xks-lkp@intel.com/config)
> compiler: clang version 21.0.0git (https://github.com/llvm/llvm-project 61529d9e36fa86782a2458e6bdeedf7f376ef4b5)
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250705/202507050736.b4hX0Xks-lkp@intel.com/reproduce)
>
> If you fix the issue in a separate patch/commit (i.e. not just a new version of
> the same patch/commit), kindly add following tags
> | Reported-by: kernel test robot <lkp@...el.com>
> | Closes: https://lore.kernel.org/oe-kbuild-all/202507050736.b4hX0Xks-lkp@intel.com/
>
> All warnings (new ones prefixed by >>):
>
>    In file included from arch/s390/boot/decompressor.c:48:
>    In file included from arch/s390/include/uapi/../../../../lib/decompress_unlz4.c:10:
>    In file included from arch/s390/include/uapi/../../../../lib/lz4/lz4_decompress.c:36:
>>> arch/s390/include/uapi/../../../../lib/lz4/lz4defs.h:109:9: warning: default initialization of an object of type 'typeof (*((const U16 *)ptr))' (aka 'const unsigned short') leaves the object uninitialized [-Wdefault-const-init-var-unsafe]
>      109 |         return get_unaligned((const U16 *)ptr);
>          |                ^

Any update on this one?