linux-kernel - Re: [PATCH v2 03/12] mm/execmem, arch: convert simple overrides of module

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Message-ID: <CAPhsuW6tDvY5G-qGMq3ymth3ip27=zAij8_UhJ-qP6Ct1U1-ZA@mail.gmail.com>
Date:   Fri, 16 Jun 2023 11:36:32 -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 03/12] mm/execmem, arch: convert simple overrides of
 module_alloc to execmem

On Fri, Jun 16, 2023 at 1:51 AM Mike Rapoport <rppt@...nel.org> wrote:
>
> From: "Mike Rapoport (IBM)" <rppt@...nel.org>
>
> Several architectures override module_alloc() only to define address
> range for code allocations different than VMALLOC address space.
>
> Provide a generic implementation in execmem that uses the parameters
> for address space ranges, required alignment and page protections
> provided by architectures.
>
> The architecures must fill execmem_params structure and implement
> execmem_arch_params() that returns a pointer to that structure. This
> way the execmem initialization won't be called from every architecure,
> but rather from a central place, namely initialization of the core
> memory management.
>
> The execmem provides execmem_text_alloc() API that wraps
> __vmalloc_node_range() with the parameters defined by the architecures.
> If an architeture does not implement execmem_arch_params(),
> execmem_text_alloc() will fall back to module_alloc().
>
> The name execmem_text_alloc() emphasizes that the allocated memory is
> for executable code, the allocations of the associated data, like data
> sections of a module will use execmem_data_alloc() interface that will
> be added later.
>
> Signed-off-by: Mike Rapoport (IBM) <rppt@...nel.org>

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