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SubjectRe: [PATCH 3/8] riscv: add ARCH_SUPPORTS_DEBUG_PAGEALLOC support
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On Mon, 17 Feb 2020 00:32:18 PST (-0800), zong.li@sifive.com wrote:
> ARCH_SUPPORTS_DEBUG_PAGEALLOC provides a hook to map and unmap
> pages for debugging purposes. Implement the __kernel_map_pages
> functions to fill the poison pattern.
>
> Signed-off-by: Zong Li <zong.li@sifive.com>
> ---
> arch/riscv/Kconfig | 3 +++
> arch/riscv/mm/pageattr.c | 13 +++++++++++++
> 2 files changed, 16 insertions(+)
>
> diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
> index 07bf1a7c0dd2..f524d7e60648 100644
> --- a/arch/riscv/Kconfig
> +++ b/arch/riscv/Kconfig
> @@ -132,6 +132,9 @@ config ARCH_SELECT_MEMORY_MODEL
> config ARCH_WANT_GENERAL_HUGETLB
> def_bool y
>
> +config ARCH_SUPPORTS_DEBUG_PAGEALLOC
> + def_bool y
> +
> config SYS_SUPPORTS_HUGETLBFS
> def_bool y
>
> diff --git a/arch/riscv/mm/pageattr.c b/arch/riscv/mm/pageattr.c
> index 7be6cd67e2ef..728759eb530a 100644
> --- a/arch/riscv/mm/pageattr.c
> +++ b/arch/riscv/mm/pageattr.c
> @@ -172,3 +172,16 @@ int set_direct_map_default_noflush(struct page *page)
>
> return walk_page_range(&init_mm, start, end, &pageattr_ops, &masks);
> }
> +
> +void __kernel_map_pages(struct page *page, int numpages, int enable)
> +{
> + if (!debug_pagealloc_enabled())
> + return;
> +
> + if (enable)
> + __set_memory((unsigned long)page_address(page), numpages,
> + __pgprot(_PAGE_PRESENT), __pgprot(0));
> + else
> + __set_memory((unsigned long)page_address(page), numpages,
> + __pgprot(0), __pgprot(_PAGE_PRESENT));
> +}

Reviewed-by: Palmer Dabbelt <palmerdabbelt@google.com>

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