linux-kernel - Re: [PATCH v2 10/12] arch: make execmem setup available regardless of CONFIG

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Message-ID: <CAPhsuW4C1zm72AkHfuo6Xz4+37AG4BgX_k2fM+xw536QeDQS+w@mail.gmail.com>
Date:   Fri, 16 Jun 2023 13:17:57 -0700
From:   Song Liu <song@...nel.org>
To:     Mike Rapoport <rppt@...nel.org>
Cc:     linux-kernel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        "David S. Miller" <davem@...emloft.net>,
        Dinh Nguyen <dinguyen@...nel.org>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Helge Deller <deller@....de>,
        Huacai Chen <chenhuacai@...nel.org>,
        Kent Overstreet <kent.overstreet@...ux.dev>,
        Luis Chamberlain <mcgrof@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Nadav Amit <nadav.amit@...il.com>,
        "Naveen N. Rao" <naveen.n.rao@...ux.ibm.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Puranjay Mohan <puranjay12@...il.com>,
        Rick Edgecombe <rick.p.edgecombe@...el.com>,
        Russell King <linux@...linux.org.uk>,
        Steven Rostedt <rostedt@...dmis.org>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        Will Deacon <will@...nel.org>, bpf@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-mips@...r.kernel.org,
        linux-mm@...ck.org, linux-modules@...r.kernel.org,
        linux-parisc@...r.kernel.org, linux-riscv@...ts.infradead.org,
        linux-s390@...r.kernel.org, linux-trace-kernel@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, loongarch@...ts.linux.dev,
        netdev@...r.kernel.org, sparclinux@...r.kernel.org, x86@...nel.org
Subject: Re: [PATCH v2 10/12] arch: make execmem setup available regardless of CONFIG_MODULES

On Fri, Jun 16, 2023 at 1:52 AM Mike Rapoport <rppt@...nel.org> wrote:
>
> From: "Mike Rapoport (IBM)" <rppt@...nel.org>
>
> execmem does not depend on modules, on the contrary modules use
> execmem.
>
> To make execmem available when CONFIG_MODULES=n, for instance for
> kprobes, split execmem_params initialization out from
> arch/kernel/module.c and compile it when CONFIG_EXECMEM=y
>
> Signed-off-by: Mike Rapoport (IBM) <rppt@...nel.org>
> ---
[...]
> +
> +struct execmem_params __init *execmem_arch_params(void)
> +{
> +       u64 module_alloc_end;
> +
> +       kaslr_init();

Aha, this addresses my comment on the earlier patch. Thanks!

Acked-by: Song Liu <song@...nel.org>


> +
> +       module_alloc_end = module_alloc_base + MODULES_VSIZE;
> +
> +       execmem_params.modules.text.pgprot = PAGE_KERNEL;
> +       execmem_params.modules.text.start = module_alloc_base;
> +       execmem_params.modules.text.end = module_alloc_end;
> +
> +       execmem_params.jit.text.pgprot = PAGE_KERNEL_ROX;
[...]