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Date: Thu, 9 Jun 2022 06:44:45 -0700
From: Luis Chamberlain <mcgrof@...nel.org>
To: "Russell King (Oracle)" <linux@...linux.org.uk>,
"Edgecombe, Rick P" <rick.p.edgecombe@...el.com>,
Christoph Hellwig <hch@...radead.org>
Cc: Jarkko Sakkinen <jarkko@...fian.com>, linux-kernel@...r.kernel.org,
Nathaniel McCallum <nathaniel@...fian.com>,
Jarkko Sakkinen <jarkko@...nel.org>,
Catalin Marinas <catalin.marinas@....com>,
Will Deacon <will@...nel.org>,
Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
"James E.J. Bottomley" <James.Bottomley@...senpartnership.com>,
Helge Deller <deller@....de>,
Michael Ellerman <mpe@...erman.id.au>,
Benjamin Herrenschmidt <benh@...nel.crashing.org>,
Paul Mackerras <paulus@...ba.org>,
Paul Walmsley <paul.walmsley@...ive.com>,
Palmer Dabbelt <palmer@...belt.com>,
Albert Ou <aou@...s.berkeley.edu>,
Heiko Carstens <hca@...ux.ibm.com>,
Vasily Gorbik <gor@...ux.ibm.com>,
Alexander Gordeev <agordeev@...ux.ibm.com>,
Christian Borntraeger <borntraeger@...ux.ibm.com>,
Sven Schnelle <svens@...ux.ibm.com>,
"David S. Miller" <davem@...emloft.net>,
Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
"H. Peter Anvin" <hpa@...or.com>,
"Naveen N. Rao" <naveen.n.rao@...ux.ibm.com>,
Anil S Keshavamurthy <anil.s.keshavamurthy@...el.com>,
Masami Hiramatsu <mhiramat@...nel.org>,
Steven Rostedt <rostedt@...dmis.org>,
Kees Cook <keescook@...omium.org>,
"Peter Zijlstra (Intel)" <peterz@...radead.org>,
Nathan Chancellor <nathan@...nel.org>,
Josh Poimboeuf <jpoimboe@...nel.org>,
Mark Rutland <mark.rutland@....com>,
"Eric W. Biederman" <ebiederm@...ssion.com>,
Marco Elver <elver@...gle.com>,
Dan Li <ashimida@...ux.alibaba.com>,
Sami Tolvanen <samitolvanen@...gle.com>,
Song Liu <song@...nel.org>, Ard Biesheuvel <ardb@...nel.org>,
Nick Desaulniers <ndesaulniers@...gle.com>,
Linus Walleij <linus.walleij@...aro.org>,
Chen Zhongjin <chenzhongjin@...wei.com>,
Nicolas Pitre <nico@...xnic.net>,
Mark Brown <broonie@...nel.org>,
Luis Machado <luis.machado@...aro.org>,
Geert Uytterhoeven <geert@...ux-m68k.org>,
Joey Gouly <joey.gouly@....com>,
Masahiro Yamada <masahiroy@...nel.org>,
Andrew Morton <akpm@...ux-foundation.org>,
Andrey Konovalov <andreyknvl@...il.com>,
Kefeng Wang <wangkefeng.wang@...wei.com>,
Atsushi Nemoto <anemo@....ocn.ne.jp>,
Guenter Roeck <linux@...ck-us.net>,
Dave Anglin <dave.anglin@...l.net>,
Christophe Leroy <christophe.leroy@...roup.eu>,
Alexei Starovoitov <ast@...nel.org>,
Nicholas Piggin <npiggin@...il.com>,
Daniel Axtens <dja@...ens.net>,
"Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>,
Jordan Niethe <jniethe5@...il.com>,
Guo Ren <guoren@...nel.org>, Anup Patel <anup@...infault.org>,
Atish Patra <atishp@...shpatra.org>,
Changbin Du <changbin.du@...el.com>,
Heiko Stuebner <heiko@...ech.de>,
Liao Chang <liaochang1@...wei.com>,
Philipp Tomsich <philipp.tomsich@...ll.eu>,
Wu Caize <zepan@...eed.com>,
Emil Renner Berthing <kernel@...il.dk>,
Alexander Egorenkov <egorenar@...ux.ibm.com>,
Thomas Richter <tmricht@...ux.ibm.com>,
Tobias Huschle <huschle@...ux.ibm.com>,
Ilya Leoshkevich <iii@...ux.ibm.com>,
Tom Lendacky <thomas.lendacky@....com>,
Daniel Bristot de Oliveira <bristot@...hat.com>,
Michael Roth <michael.roth@....com>,
"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
Javier Martinez Canillas <javierm@...hat.com>,
Miroslav Benes <mbenes@...e.cz>,
André Almeida <andrealmeid@...lia.com>,
Tiezhu Yang <yangtiezhu@...ngson.cn>,
Dmitry Torokhov <dmitry.torokhov@...il.com>,
Aaron Tomlin <atomlin@...hat.com>,
linux-arm-kernel@...ts.infradead.org, linux-mips@...r.kernel.org,
linux-parisc@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
linux-riscv@...ts.infradead.org, linux-s390@...r.kernel.org,
sparclinux@...r.kernel.org, linux-modules@...r.kernel.org
Subject: Re: [PATCH] kprobes: Enable tracing for mololithic kernel images
On Thu, Jun 09, 2022 at 08:47:38AM +0100, Russell King (Oracle) wrote:
> On Wed, Jun 08, 2022 at 02:59:27AM +0300, Jarkko Sakkinen wrote:
> > diff --git a/arch/arm/kernel/Makefile b/arch/arm/kernel/Makefile
> > index 553866751e1a..d2bb954cd54f 100644
> > --- a/arch/arm/kernel/Makefile
> > +++ b/arch/arm/kernel/Makefile
> > @@ -44,6 +44,11 @@ obj-$(CONFIG_CPU_IDLE) += cpuidle.o
> > obj-$(CONFIG_ISA_DMA_API) += dma.o
> > obj-$(CONFIG_FIQ) += fiq.o fiqasm.o
> > obj-$(CONFIG_MODULES) += armksyms.o module.o
> > +ifeq ($(CONFIG_MODULES),y)
> > +obj-y += module_alloc.o
> > +else
> > +obj-$(CONFIG_KPROBES) += module_alloc.o
> > +endif
>
> Doesn't:
>
> obj-$(CONFIG_MODULES) += module_alloc.o
> obj-$(CONFIG_KPROBES) += module_alloc.o
That just begs for a new kconfig symbol for the object, and for
the object then to be built with it.
The archs which override the default can use ARCH_HAS_VM_ALLOC_EXEC.
Please note that the respective free is important as well and its
not clear if we need an another define for the free. Someone has
to do that work. We want to ensure to noexec the code on free and
this can vary on each arch.
> work just as well? The kbuild modules.rst documentation says:
>
> The order of files in $(obj-y) is significant. Duplicates in
> the lists are allowed: the first instance will be linked into
> built-in.a and succeeding instances will be ignored.
>
> so you should be fine... or the documentation is wrong!
Agreed, but this is just sloppy, better to use a new kconfig symbol
to represent what is actually being required.
Luis
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