linux-kernel - Re: [PATCH 5.18 000/231] 5.18.13-rc1 review

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Message-ID: <CA+G9fYsJBBbEXowA-3kxDNqcfbtcqmxBrEnJSkCnLUsMzNfJZw@mail.gmail.com>
Date:   Wed, 20 Jul 2022 09:00:15 +0530
From:   Naresh Kamboju <naresh.kamboju@...aro.org>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        stable <stable@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Guenter Roeck <linux@...ck-us.net>,
        Shuah Khan <shuah@...nel.org>, patches@...nelci.org,
        lkft-triage@...ts.linaro.org, Pavel Machek <pavel@...x.de>,
        Jon Hunter <jonathanh@...dia.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Sudip Mukherjee <sudipm.mukherjee@...il.com>,
        Slade Watkins <slade@...dewatkins.com>,
        John Harrison <John.C.Harrison@...el.com>,
        Tejas Upadhyay <tejas.upadhyay@...el.com>,
        Anusha Srivatsa <anusha.srivatsa@...el.com>,
        Jani Nikula <jani.nikula@...el.com>,
        Daniele Ceraolo Spurio <daniele.ceraolospurio@...el.com>
Subject: Re: [PATCH 5.18 000/231] 5.18.13-rc1 review

Hi Linus,

On Wed, 20 Jul 2022 at 01:03, Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
>
> On Tue, Jul 19, 2022 at 10:57 AM Naresh Kamboju
> <naresh.kamboju@...aro.org> wrote:
> >
> >
> > Details log:
> > ------------
> > 1. i386 build failures with clang-13 and clang-14
> > make --silent --keep-going --jobs=8
> > O=/home/tuxbuild/.cache/tuxmake/builds/1/build LLVM=1 LLVM_IAS=1
> > ARCH=i386 CROSS_COMPILE=i686-linux-gnu- 'HOSTCC=sccache clang'
> > 'CC=sccache clang'
> > ld.lld: error: undefined symbol: __udivdi3
>
> Looks like the one introduced by aff1e0b09b54 ("drm/i915/ttm: fix
> sg_table construction"), and fixed by ced7866db39f ("drm/i915/ttm: fix
> 32b build").
>
> > 2. Large number of build warnings on x86 with gcc-11,
> > I do not see these build warnings on mainline,
> ..
> > 'naked' return found in RETPOLINE build
>
> Hmm. Does your cross-compiler support '-mfunction-return=thunk-extern'?
>
> Your build does magic things with 'scripts/kconfig/merge_config.sh',
> and I'm wondering if you perhaps end up enabling CONFIG_RETHUNK with a
> compiler that doesn't actually support it, or something like that?

I see the diff of the defconfig file from the previous release.

The new config is causing a lot of warnings.
        init/calibrate.o: warning: objtool: calibrate_delay_is_known()+0x2:
              'naked' return found in RETPOLINE build


Following configs have been deleted in new defconfig
CONFIG_RETHUNK=y
CONFIG_CC_HAS_RETURN_THUNK=y
CONFIG_SPECULATION_MITIGATIONS=y
CONFIG_CPU_UNRET_ENTRY=y
CONFIG_CPU_IBPB_ENTRY=y
CONFIG_CPU_IBRS_ENTRY=y

--- good-config 2022-07-13 02:22:04.000000000 +0530
+++ warning-config 2022-07-19 17:37:17.000000000 +0530
@@ -1,15 +1,15 @@
 #
 # Automatically generated file; DO NOT EDIT.
-# Linux/x86_64 5.18.12-rc1 Kernel Configuration
+# Linux/x86_64 5.18.13-rc1 Kernel Configuration
 #
 CONFIG_CC_VERSION_TEXT="x86_64-linux-gnu-gcc (Debian 11.3.0-3) 11.3.0"
 CONFIG_CC_IS_GCC=y
 CONFIG_GCC_VERSION=110300
 CONFIG_CLANG_VERSION=0
 CONFIG_AS_IS_GNU=y
-CONFIG_AS_VERSION=23800
+CONFIG_AS_VERSION=23850
 CONFIG_LD_IS_BFD=y
-CONFIG_LD_VERSION=23800
+CONFIG_LD_VERSION=23850
 CONFIG_LLD_VERSION=0
 CONFIG_CC_CAN_LINK=y
 CONFIG_CC_CAN_LINK_STATIC=y
@@ -317,6 +317,9 @@
 # CONFIG_X86_X2APIC is not set
 CONFIG_X86_MPPARSE=y
 # CONFIG_GOLDFISH is not set
+CONFIG_RETPOLINE=y
+CONFIG_CC_HAS_SLS=y
+# CONFIG_SLS is not set
 # CONFIG_X86_CPU_RESCTRL is not set
 CONFIG_X86_EXTENDED_PLATFORM=y
 # CONFIG_X86_VSMP is not set
@@ -467,16 +470,6 @@
 CONFIG_HAVE_LIVEPATCH=y
 # end of Processor type and features

-CONFIG_CC_HAS_SLS=y
-CONFIG_CC_HAS_RETURN_THUNK=y
-CONFIG_SPECULATION_MITIGATIONS=y
-CONFIG_PAGE_TABLE_ISOLATION=y
-CONFIG_RETPOLINE=y
-CONFIG_RETHUNK=y
-CONFIG_CPU_UNRET_ENTRY=y
-CONFIG_CPU_IBPB_ENTRY=y
-CONFIG_CPU_IBRS_ENTRY=y
-# CONFIG_SLS is not set
 CONFIG_ARCH_HAS_ADD_PAGES=y
 CONFIG_ARCH_MHP_MEMMAP_ON_MEMORY_ENABLE=y

@@ -4318,6 +4311,7 @@
 CONFIG_SECURITY_WRITABLE_HOOKS=y
 # CONFIG_SECURITYFS is not set
 CONFIG_SECURITY_NETWORK=y
+CONFIG_PAGE_TABLE_ISOLATION=y
 # CONFIG_SECURITY_NETWORK_XFRM is not set
 # CONFIG_SECURITY_PATH is not set
 # CONFIG_INTEL_TXT is not set




--
Linaro LKFT
https://lkft.linaro.org