linux-kernel - Re: [PATCH v3] mm: make minimum slab alignment a runtime property

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Date:   Tue, 26 Apr 2022 11:15:56 -0700
From:   Peter Collingbourne <pcc@...gle.com>
To:     Vlastimil Babka <vbabka@...e.cz>
Cc:     kernel test robot <lkp@...el.com>,
        Andrey Konovalov <andreyknvl@...il.com>,
        Hyeonggon Yoo <42.hyeyoo@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Catalin Marinas <catalin.marinas@....com>,
        llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        Linux Memory Management List <linux-mm@...ck.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Pekka Enberg <penberg@...nel.org>, roman.gushchin@...ux.dev,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        David Rientjes <rientjes@...gle.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Andrey Ryabinin <ryabinin.a.a@...il.com>,
        Alexander Potapenko <glider@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        kasan-dev <kasan-dev@...glegroups.com>,
        Eric Biederman <ebiederm@...ssion.com>,
        Kees Cook <keescook@...omium.org>
Subject: Re: [PATCH v3] mm: make minimum slab alignment a runtime property

On Tue, Apr 26, 2022 at 8:12 AM Vlastimil Babka <vbabka@...e.cz> wrote:
>
> On 4/25/22 07:12, kernel test robot wrote:
> > Hi Peter,
> >
> > Thank you for the patch! Yet something to improve:
> >
> > [auto build test ERROR on hnaz-mm/master]
> >
> > url:    https://github.com/intel-lab-lkp/linux/commits/Peter-Collingbourne/mm-make-minimum-slab-alignment-a-runtime-property/20220423-042024
> > base:   https://github.com/hnaz/linux-mm master
> > config: arm64-buildonly-randconfig-r002-20220425 (https://download.01.org/0day-ci/archive/20220425/202204251346.WbwgrNZw-lkp@intel.com/config)
> > compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 1cddcfdc3c683b393df1a5c9063252eb60e52818)
> > reproduce (this is a W=1 build):
> >         wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
> >         chmod +x ~/bin/make.cross
> >         # install arm64 cross compiling tool for clang build
> >         # apt-get install binutils-aarch64-linux-gnu
> >         # https://github.com/intel-lab-lkp/linux/commit/3aef97055dd4a480e05dff758164f153aaddbb49
> >         git remote add linux-review https://github.com/intel-lab-lkp/linux
> >         git fetch --no-tags linux-review Peter-Collingbourne/mm-make-minimum-slab-alignment-a-runtime-property/20220423-042024
> >         git checkout 3aef97055dd4a480e05dff758164f153aaddbb49
> >         # save the config file
> >         mkdir build_dir && cp config build_dir/.config
> >         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm64 prepare
> >
> > If you fix the issue, kindly add following tag as appropriate
> > Reported-by: kernel test robot <lkp@...el.com>
> >
> > All errors (new ones prefixed by >>):
> >
> >    In file included from kernel/bounds.c:10:
> >    In file included from include/linux/page-flags.h:10:
> >    In file included from include/linux/bug.h:5:
> >    In file included from arch/arm64/include/asm/bug.h:26:
> >    In file included from include/asm-generic/bug.h:22:
> >    In file included from include/linux/printk.h:9:
> >    In file included from include/linux/cache.h:6:
> >    In file included from arch/arm64/include/asm/cache.h:56:
> >    In file included from include/linux/kasan-enabled.h:5:
> >    In file included from include/linux/static_key.h:1:
>
> Hmm looks like a circular include, cache.h is too "low-level" in the
> hierarchy to bring in kasan->static_key->jump_label.h definitions?
> jump_label.h does include bug.h, but we have it above already and have
> already passed #define _LINUX_BUG_H.
>
> So, a different kind of header with arm64-specific variant?

The fix that I'm pursuing starts with:

diff --git a/include/linux/printk.h b/include/linux/printk.h
index 1522df223c0f..8e8d74edf121 100644
--- a/include/linux/printk.h
+++ b/include/linux/printk.h
@@ -6,7 +6,6 @@
 #include <linux/init.h>
 #include <linux/kern_levels.h>
 #include <linux/linkage.h>
-#include <linux/cache.h>
 #include <linux/ratelimit_types.h>
 #include <linux/once_lite.h>

and fixing the fallout from code that was including printk.h and
depending on something from cache.h. So far I haven't found much, only
3 fixups required for an arm64 defconfig kernel but I'm trying some
more configs as well.

Peter