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ZQ== From mboxrd@z Thu Jan 1 00:00:00 1970 Content-Type: multipart/mixed; boundary="===============3444341748062473352==" MIME-Version: 1.0 From: Christophe Leroy To: kbuild-all@lists.01.org Subject: Re: [PATCH v5 5/5] powerpc/inst: Optimise copy_inst_from_kernel_nofault() Date: Tue, 07 Dec 2021 07:55:43 +0000 Message-ID: <497d1646-3fd6-8acc-16f3-7abce672c97a@csgroup.eu> In-Reply-To: List-Id: --===============3444341748062473352== Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Le 07/12/2021 =C3=A0 07:41, Nathan Chancellor a =C3=A9crit=C2=A0: > On Tue, Dec 07, 2021 at 05:45:08AM +0000, Christophe Leroy wrote: >> >> >> Le 07/12/2021 =C3=A0 05:48, Nathan Chancellor a =C3=A9crit=C2=A0: >>> On Tue, Dec 07, 2021 at 02:37:26PM +1100, Michael Ellerman wrote: >>>> Bill Wendling writes: >>>>> On Tue, Nov 30, 2021 at 10:38 AM Bill Wendling w= rote: >>>>>> On Tue, Nov 30, 2021 at 10:17 AM Nathan Chancellor wrote: >>>>>>> On Tue, Nov 30, 2021 at 10:25:43PM +1100, Michael Ellerman wrote: >>>>>>>> Christophe Leroy writes: >>>>>>>>> Le 29/11/2021 =C3=A0 23:55, kernel test robot a =C3=A9crit : >>>> ... >>>>>>>>>> All warnings (new ones prefixed by >>): >>>>>>>>>> >>>>>>>>>> In file included from arch/powerpc/kernel/asm-offsets.c:71: >>>>>>>>>> In file included from arch/powerpc/kernel/../xmon/xmon_bpt= s.h:7: >>>>>>>>>>>> arch/powerpc/include/asm/inst.h:165:20: warning: variable 'val= ' is uninitialized when used here [-Wuninitialized] >>>>>>>>>> *inst =3D ppc_inst(val); >>>>>>>>>> ^~~ >>>>>>>>>> arch/powerpc/include/asm/inst.h:53:22: note: expanded from= macro 'ppc_inst' >>>>>>>>>> #define ppc_inst(x) (x) >>>>>>>>>> ^ >>>>>>>>>> arch/powerpc/include/asm/inst.h:155:18: note: initialize t= he variable 'val' to silence this warning >>>>>>>>>> unsigned int val, suffix; >>>>>>>>>> ^ >>>>>>>>>> =3D 0 >>>>>>>>> >>>>>>>>> I can't understand what's wrong here. >>>> ... >>>>>>>>> >>>>>>>>> I see no possibility, no alternative path where val wouldn't be s= et. The >>>>>>>>> asm clearly has *addr as an output param so it is always set. >>>>>>>> >>>>>>>> I guess clang can't convince itself of that? >>>> ... >>>>>>> >>>>>>> It certainly looks like there is something wrong with how clang is >>>>>>> tracking the initialization of the variable because it looks to me = like >>>>>>> val is only used in the fallthrough path, which happens after it is >>>>>>> initialized via lwz. Perhaps something is wrong with the logic of >>>>>>> https://reviews.llvm.org/D71314? I've added Bill to CC (LLVM issue= s are >>>>>>> being migrated from Bugzilla to GitHub Issues right now so I cannot= file >>>>>>> this upstream at the moment). >>>>>>> >>>>>> If I remove the casts of "val" the warning doesn't appear. I suspect >>>>>> that when I wrote that patch I forgot to remove those when checking. >>>>>> #include "Captain_Picard_facepalm.h" >>>>>> >>>>>> I'll look into it. >>>>>> >>>>> Small retraction. It's the "*()&val" that's the issue. (I.e. th= e "*&") >>>> >>>> I guess for now I'll just squash this in as a workaround? >>>> >>>> >>>> diff --git a/arch/powerpc/include/asm/inst.h b/arch/powerpc/include/as= m/inst.h >>>> index 631436f3f5c3..5b591c51fec9 100644 >>>> --- a/arch/powerpc/include/asm/inst.h >>>> +++ b/arch/powerpc/include/asm/inst.h >>>> @@ -157,6 +157,9 @@ static inline int copy_inst_from_kernel_nofault(pp= c_inst_t *inst, u32 *src) >>>> if (unlikely(!is_kernel_addr((unsigned long)src))) >>>> return -ERANGE; >>> >>> Could we add a version check to this and a link to our bug tracker: >>> >>> /* https://github.com/ClangBuiltLinux/linux/issues/1521 */ >>> #if defined(CONFIG_CC_IS_CLANG) && CONFIG_CLANG_VERSION < 140000 >> >> The robot reported the problem on: >> >> compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project >> df08b2fe8b35cb63dfb3b49738a3494b9b4e6f8e) >> >> Should it be CONFIG_CLANG_VERSION <=3D 140000 ? > = > The robot tests clang from tip of tree, rebuilding every week or so. The > fix is getting ready to land so it will be released in 14.0.0 final. We > have always written tip of tree version checks with the expectation that > if people are testing tip of tree clang, they are frequently rebuilding. > If that is not true, they need to be using released/stable versions, > otherwise the model is broken. > = > If that is too problematic, we could add a version check to Kconfig > (cannot think of a great name for the config off the top of my head) > that checks for this issue and ifdef on that. That might be nice in > case another instance of this crops up in the future. > = It's fine for me. I didn't know robot was using prereleases with the = same name as the future release. Christophe --===============3444341748062473352==--