From: Nathan Chancellor <nathan@kernel.org>
To: Kees Cook <keescook@chromium.org>
Cc: kernel test robot <lkp@intel.com>,
llvm@lists.linux.dev, oe-kbuild-all@lists.linux.dev,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Marco Elver <elver@google.com>,
Andrew Morton <akpm@linux-foundation.org>,
Linux Memory Management List <linux-mm@kvack.org>
Subject: Re: [stable:linux-5.15.y 36/9999] arch/s390/kernel/vtime.c:132:2: error: expected absolute expression
Date: Tue, 23 May 2023 10:45:25 -0700 [thread overview]
Message-ID: <20230523174525.GA1388474@dev-arch.thelio-3990X> (raw)
In-Reply-To: <202305111519.04845F7@keescook>
On Thu, May 11, 2023 at 03:21:01PM -0700, Kees Cook wrote:
> On Thu, May 11, 2023 at 05:14:16PM +0800, kernel test robot wrote:
> > FYI, the error/warning still remains.
> >
> > tree: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git linux-5.15.y
> > head: 8a7f2a5c5aa1648edb4f2029c6ec33870afb7a95
> > commit: 33db9912ff7c491f839c89a08e98f755aa09598f [36/9999] ubsan: remove CONFIG_UBSAN_OBJECT_SIZE
> > [...]
> > >> arch/s390/kernel/vtime.c:132:2: error: cpu alternatives does not support instructions blocks > 254 bytes
> > alternative_io("stpt %0\n .insn s,0xb2050000,%1\n",
> > ^
>
> Thanks for the report! I don't think the new errors are related to this
> removal, though. This patch was just disabling a potential build config.
Right, I am not really sure how the robot landed on this (perhaps there
was another error that was being exposed by CONFIG_UBSAN_OBJECT_SIZE
that disappeared with its removal?) but this is a problem with s390
specific code and clang's integrated assembler. I suspect it would be
fixed with one of the patches from this series that landed in 5.19 but I
have not looked too closely:
https://lore.kernel.org/20220511120532.2228616-1-hca@linux.ibm.com/
https://lore.kernel.org/Yot+xzLZETNTxNo+@osiris/
We use LLVM_IAS=0 for s390 on 5.15 in CI, hence why we do not see this.
Cheers,
Nathan
prev parent reply other threads:[~2023-05-23 17:45 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-05-11 9:14 [stable:linux-5.15.y 36/9999] arch/s390/kernel/vtime.c:132:2: error: expected absolute expression kernel test robot
2023-05-11 22:21 ` Kees Cook
2023-05-23 17:45 ` Nathan Chancellor [this message]
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