Date:   Sat, 6 Oct 2018 21:41:22 +0200
From:   Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
To:     sedat.dilek@...il.com
Cc:     Andreas Dilger <adilger.kernel@...ger.ca>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Michal Marek <michal.lkml@...kovi.net>,
        Steven Rostedt <rostedt@...dmis.org>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        Olof Johansson <olof@...m.net>,
        Konstantin Ryabitsev <konstantin@...uxfoundation.org>,
        David Miller <davem@...emloft.net>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Kees Cook <keescook@...omium.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>,
        Paul Lawrence <paullawrence@...gle.com>,
        Sandipan Das <sandipan@...ux.vnet.ibm.com>,
        Andrey Konovalov <andreyknvl@...gle.com>,
        David Woodhouse <dwmw2@...radead.org>,
        Will Deacon <will.deacon@....com>,
        Philippe Ombredanne <pombredanne@...b.com>,
        Paul Burton <paul.burton@...s.com>,
        David Rientjes <rientjes@...gle.com>, Willy Tarreau <w@....eu>,
        Martin Sebor <msebor@...il.com>,
        Christopher Li <sparse@...isli.org>,
        Jonathan Corbet <corbet@....net>, "Ted Ts'o" <tytso@....edu>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Joe Perches <joe@...ches.com>, Arnd Bergmann <arnd@...db.de>,
        Dominique Martinet <asmadeus@...ewreck.org>,
        Stefan Agner <stefan@...er.ch>,
        Luc Van Oostenryck <luc.vanoostenryck@...il.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Greg KH <gregkh@...uxfoundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Linux Doc Mailing List <linux-doc@...r.kernel.org>,
        Ext4 Developers List <linux-ext4@...r.kernel.org>,
        linux-sparse@...r.kernel.org, linux-kbuild@...r.kernel.org,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5 00/15] Compiler Attributes

[CC'ing this message to linux-kernel so that we get it into the
archive at lore.kernel.org]

On Sat, Oct 6, 2018 at 9:13 AM Sedat Dilek <sedat.dilek@...il.com> wrote:
>
> On Sun, Sep 30, 2018 at 1:11 PM Miguel Ojeda
> <miguel.ojeda.sandonis@...il.com> wrote:
> >
> > Thanks a lot for testing! Which configuration roughly (e.g.
> > allmodconfig)? Did you boot it & run it for a while?
> >
>
> Hi Miguel,
>
> I am doing all my "ClangBuiltLinux" (short: cbl) experiments on
> Debian/testing AMD64 (which will be buster aka version 10).
>
> https://github.com/ClangBuiltLinux/linux
>
> I am using the kernel-config provided by the Debian Kernel Team -
> means be as close to my upstream.
>
> https://packages.debian.org/experimental/linux-image-4.19.0-rc4-amd64-unsigned
>
> Clang version 7 from Debian/unstable is the compiler I am using.
>
> https://packages.debian.org/clang-7
>
> Currently, some Kconfigs are known to be "BROKEN" (with Clang or
> independent of the used compiler).
> CONFIG_HARDENED_USERCOPY=n
> CONFIG_DRM_AMDGPU=n (built as module broken, not sure if this was
> fixed in meantime).
>
> https://github.com/ClangBuiltLinux/linux/issues/7
> https://lists.freedesktop.org/archives/amd-gfx/2018-July/024634.html
>
> In my testoings I am booting in QEMU and on bare metal.
> Both tests were successful.
>
> My last testings of your series v5 was on top of Linux v4.19-rc6.
> I have some more patches included (see below).
>
> My kernel-config and dmesg-log are attached.
>
> Hope this helps.
>
> Regards,
> - Sedat -
>
> P.S.: Some helpful informations
>
> [ VERSION ]
>
> $ cat /proc/version
> Linux version 4.19.0-rc6-1-amd64-cbl (sedat.dilek@...il.com@...za)
> (clang version 7.0.0-3 (tags/RELEASE_700/final)) #1 SMP 2018-10-01
>
> [ PATCH-SET ]
>
> $ git --no-pager log --no-merges --oneline v4.19-rc6..
> c1b160655219 (for-4.19/compiler-attributes-v5) Compiler Attributes:
> ext4: remove local __nonstring definition
> e33fe800b910 Compiler Attributes: auxdisplay: panel: use __nonstring
> 2d5e0d827ee0 Compiler Attributes: enable -Wstringop-truncation on W=1 (gcc >= 8)
> 1ab27d366e9f Compiler Attributes: add support for __nonstring (gcc >= 8)
> 58d53af4577c Compiler Attributes: add MAINTAINERS entry
> 8dbfe0eec5c1 Compiler Attributes: add Doc/process/programming-language.rst
> 5a886fa546eb Compiler Attributes: remove uses of __attribute__ from compiler.h
> 8414944bdb94 Compiler Attributes: KENTRY used twice the "used" attribute
> 16da1f71ccf1 Compiler Attributes: use feature checks instead of version checks
> efe932a226e2 Compiler Attributes: add missing SPDX ID in compiler_types.h
> f5add77ef51a Compiler Attributes: remove unneeded sparse (__CHECKER__) tests
> 5b1c25d038ac Compiler Attributes: homogenize __must_be_array
> 4bce3ce73e44 Compiler Attributes: remove unneeded tests
> 899d7604d8c2 Compiler Attributes: always use the extra-underscores syntax
> 704bd38d6793 Compiler Attributes: remove unused attributes
> ef8c4ed9db80 kbuild: allow to use GCC toolchain not in Clang search path
> 5a4630aadb9a ftrace: Build with CPPFLAGS to get -Qunused-arguments
> 9f9ff0dc3aed (for-4.19/x86-asm-goto-clang-fixes)
> include/linux/compiler*.h: add version detection to asm_volatile_goto
> cca6adeee1db kbuild: add --include-dir flag only for out-of-tree build
> bb5de5d28f73 kbuild: remove unneeded link_multi_deps
> 00d78ab2ba75 kbuild: remove dead code in cmd_files calculation in top Makefile
> 25815cf5ffec kbuild: hide most of targets when running config or mixed targets
> 0d91bf584fe5 kbuild: remove old check for CFLAGS use
> 487c7c7702ab kbuild: prefix Makefile.dtbinst path with $(srctree)
> unconditionally
> 36f546a1bdb5 kallsyms: remove left-over Blackfin code
> 80ffbaa5b1bd kallsyms: reduce size a little on 64-bit
> bac13b5b25c9 x86: Warn clang does not support asm-goto (v2)
> 1e98b02f5c59 (for-4.19/compiletime_assert-clang-fixes) compiler.h:
> give up __compiletime_assert_fallback()
>
> [ QEMU TESTING (run_qemu.sh) ]
> KPATH=$(pwd)
>
> qemu-system-x86_64 -enable-kvm -M pc -kernel $KPATH/bzImage -initrd
> $KPATH/initrd.img -m 512 -net none -serial stdio -append
> "root=/dev/ram0 console=ttyS0 hung_task_panic=1
> earlyprintk=ttyS0,115200"
>
> [ DEBIAN KERNEL VS. CBL KERNEL ]
>
> $ ./scripts/diffconfig /boot/config-4.19.0-rc4-amd64
> /boot/config-4.19.0-rc6-1-amd64-cbl
> -ALLOW_LOCKDOWN_LIFT_BY_SYSRQ n
> -ANDROID_BINDER_DEVICES "binder"
> -ANDROID_BINDER_IPC_SELFTEST n
> -CC_IS_GCC y
> -CHASH m
> -CHASH_SELFTEST n
> -CHASH_STATS n
> -CRYPTO_FIPS y
> -DEBUG_KERNEL_DC n
> -DRM_AMDGPU_CIK y
> -DRM_AMDGPU_GART_DEBUGFS n
> -DRM_AMDGPU_SI y
> -DRM_AMDGPU_USERPTR y
> -DRM_AMD_ACP y
> -DRM_AMD_DC y
> -DRM_AMD_DC_DCN1_0 y
> -DRM_SCHED m
> -HARDENED_USERCOPY_FALLBACK n
> -HARDENED_USERCOPY_PAGESPAN n
> -HSA_AMD m
> -LOCK_DOWN_IN_EFI_SECURE_BOOT y
> -LOCK_DOWN_KERNEL y
> -MODULE_SIG_ALL n
> -MODULE_SIG_FORCE n
> -MODULE_SIG_HASH "sha256"
> -MODULE_SIG_KEY ""
> -MODULE_SIG_SHA1 n
> -MODULE_SIG_SHA224 n
> -MODULE_SIG_SHA256 y
> -MODULE_SIG_SHA384 n
> -MODULE_SIG_SHA512 n
> -PLUGIN_HOSTCC ""
> -PM_GENERIC_DOMAINS y
> -PM_GENERIC_DOMAINS_SLEEP y
> -RTLWIFI_DEBUG_ST y
> -SECURITY_PERF_EVENTS_RESTRICT y
> -X86_X32_DISABLED y
>  ANDROID_BINDER_IPC m -> n
>  ASHMEM m -> n
>  BUILD_SALT "4.19.0-rc4-amd64" -> "4.19.0-rc6-1-amd64-cbl"
>  CLANG_VERSION 0 -> 70000
>  DRM_AMDGPU m -> n
>  GCC_VERSION 80200 -> 0
>  HARDENED_USERCOPY y -> n
>  MODULE_SIG y -> n
>  R8822BE m -> n
>  SYSTEM_TRUSTED_KEYS "debian/certs/test-signing-certs.pem" -> ""
>  TYPEC_TPS6598X m -> n
>  USB_COMMON m -> y
>  X86_X32 y -> n
> +CC_IS_CLANG y
> +FB_NVIDIA n
> +FB_RIVA n
>
> - EOT -

Cheers,
Miguel

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