linux-kernel - Re: (No subject)

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Date:   Mon, 27 Dec 2021 17:35:37 +0000
From:   William Kucharski <william.kucharski@...cle.com>
To:     Kefeng Wang <wangkefeng.wang@...wei.com>
CC:     Jonathan Corbet <corbet@....net>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "x86@...nel.org" <x86@...nel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        Nicholas Piggin <npiggin@...il.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Matthew Wilcox <willy@...radead.org>
Subject: Re: (No subject)

You should also fix the existing typo in the documentation (inline):

> On Dec 27, 2021, at 07:49, Kefeng Wang <wangkefeng.wang@...wei.com> wrote:
> 
> This patch select HAVE_ARCH_HUGE_VMALLOC to let arm64 support huge
> vmalloc mappings.
> 
> Cc: Catalin Marinas <catalin.marinas@....com>
> Cc: Will Deacon <will@...nel.org>
> Signed-off-by: Kefeng Wang <wangkefeng.wang@...wei.com>
> ---
> Documentation/admin-guide/kernel-parameters.txt | 4 ++--
> arch/arm64/Kconfig                              | 1 +
> arch/arm64/kernel/module.c                      | 5 +++--
> 3 files changed, 6 insertions(+), 4 deletions(-)
> 
> diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
> index 7b2f900fd243..e3f9fd7ec106 100644
> --- a/Documentation/admin-guide/kernel-parameters.txt
> +++ b/Documentation/admin-guide/kernel-parameters.txt
> @@ -1639,7 +1639,7 @@
>            precedence over memory_hotplug.memmap_on_memory.
> 
> 
> -    hugevmalloc=    [PPC] Reguires CONFIG_HAVE_ARCH_HUGE_VMALLOC
> +    hugevmalloc=    [KNL,PPC,ARM64] Reguires CONFIG_HAVE_ARCH_HUGE_VMALLOC
>            Format: { on | off }
>            Default set by CONFIG_HUGE_VMALLOC_DEFAULT_ENABLED.

"Reguires" should be "Requires." 

> 
> @@ -3424,7 +3424,7 @@
> 
>    nohugeiomap    [KNL,X86,PPC,ARM64] Disable kernel huge I/O mappings.
> 
> -    nohugevmalloc    [PPC] Disable kernel huge vmalloc mappings.
> +    nohugevmalloc    [KNL,PPC,ARM64] Disable kernel huge vmalloc mappings.
> 
>    nosmt        [KNL,S390] Disable symmetric multithreading (SMT).
>            Equivalent to smt=1.
> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
> index 3bb0b67292b5..c34bbb4482b0 100644
> --- a/arch/arm64/Kconfig
> +++ b/arch/arm64/Kconfig
> @@ -142,6 +142,7 @@ config ARM64
>    select HAVE_ARCH_AUDITSYSCALL
>    select HAVE_ARCH_BITREVERSE
>    select HAVE_ARCH_COMPILER_H
> +    select HAVE_ARCH_HUGE_VMALLOC
>    select HAVE_ARCH_HUGE_VMAP
>    select HAVE_ARCH_JUMP_LABEL
>    select HAVE_ARCH_JUMP_LABEL_RELATIVE
> diff --git a/arch/arm64/kernel/module.c b/arch/arm64/kernel/module.c
> index 309a27553c87..af7b4cbace2b 100644
> --- a/arch/arm64/kernel/module.c
> +++ b/arch/arm64/kernel/module.c
> @@ -36,7 +36,8 @@ void *module_alloc(unsigned long size)
>        module_alloc_end = MODULES_END;
> 
>    p = __vmalloc_node_range(size, MODULE_ALIGN, module_alloc_base,
> -                module_alloc_end, gfp_mask, PAGE_KERNEL, VM_DEFER_KMEMLEAK,
> +                module_alloc_end, gfp_mask, PAGE_KERNEL,
> +                VM_DEFER_KMEMLEAK | VM_NO_HUGE_VMAP,
>                NUMA_NO_NODE, __builtin_return_address(0));
> 
>    if (!p && IS_ENABLED(CONFIG_ARM64_MODULE_PLTS) &&
> @@ -55,7 +56,7 @@ void *module_alloc(unsigned long size)
>         */
>        p = __vmalloc_node_range(size, MODULE_ALIGN, module_alloc_base,
>                module_alloc_base + SZ_2G, GFP_KERNEL,
> -                PAGE_KERNEL, 0, NUMA_NO_NODE,
> +                PAGE_KERNEL, VM_NO_HUGE_VMAP, NUMA_NO_NODE,
>                __builtin_return_address(0));
> 
>    if (p && (kasan_module_alloc(p, size, gfp_mask) < 0)) {
> -- 
> 2.26.2
> 
>