linux-kernel - Re: [PATCH 1/4] riscv: Fix TASK_SIZE on 64-bit NOMMU

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Message-ID: <ZgPE5e7FzB5H4MnK@xhacker>
Date: Wed, 27 Mar 2024 15:04:05 +0800
From: Jisheng Zhang <jszhang@...nel.org>
To: Samuel Holland <samuel.holland@...ive.com>
Cc: Palmer Dabbelt <palmer@...belt.com>, linux-riscv@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/4] riscv: Fix TASK_SIZE on 64-bit NOMMU

On Mon, Feb 26, 2024 at 04:34:46PM -0800, Samuel Holland wrote:
> On NOMMU, userspace memory can come from anywhere in physical RAM. The
> current definition of TASK_SIZE is wrong if any RAM exists above 4G,
> causing spurious failures in the userspace access routines.
> 
> Fixes: 6bd33e1ece52 ("riscv: add nommu support")
> Fixes: c3f896dcf1e4 ("mm: switch the test_vmalloc module to use __vmalloc_node")
> Signed-off-by: Samuel Holland <samuel.holland@...ive.com>

Reviewed-by: Jisheng Zhang <jszhang@...nel.org>

> ---
> 
>  arch/riscv/include/asm/pgtable.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h
> index 0c94260b5d0c..a564a39e5676 100644
> --- a/arch/riscv/include/asm/pgtable.h
> +++ b/arch/riscv/include/asm/pgtable.h
> @@ -882,7 +882,7 @@ static inline pte_t pte_swp_clear_exclusive(pte_t pte)
>  #define PAGE_SHARED		__pgprot(0)
>  #define PAGE_KERNEL		__pgprot(0)
>  #define swapper_pg_dir		NULL
> -#define TASK_SIZE		0xffffffffUL
> +#define TASK_SIZE		_AC(-1, UL)
>  #define VMALLOC_START		_AC(0, UL)
>  #define VMALLOC_END		TASK_SIZE
>  
> -- 
> 2.43.0
> 
> 
> _______________________________________________
> linux-riscv mailing list
> linux-riscv@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-riscv

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