linux-kernel - Re: [PATCH] riscv: move flush_icache_range/user_range() after flush_icache

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Date:   Thu, 26 Sep 2019 10:23:29 +0800
From:   Kefeng Wang <wangkefeng.wang@...wei.com>
To:     <linux-riscv@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        "Palmer Dabbelt" <palmer@...ive.com>
CC:     Paul Walmsley <paul.walmsley@...ive.com>,
        Albert Ou <aou@...s.berkeley.edu>
Subject: Re: [PATCH] riscv: move flush_icache_range/user_range() after
 flush_icache_all()

Please ignore this version.

On 2019/9/26 10:29, Kefeng Wang wrote:
> When build lkdtm module, which used flush_icache_range(), error occurred,
>
> ERROR: "flush_icache_all" [drivers/misc/lkdtm/lkdtm.ko] undefined!
>
> Fix it.
>
> Cc: Paul Walmsley <paul.walmsley@...ive.com>
> Cc: Palmer Dabbelt <palmer@...ive.com>
> Cc: Albert Ou <aou@...s.berkeley.edu>
> Signed-off-by: Kefeng Wang <wangkefeng.wang@...wei.com>
> ---
>  arch/riscv/include/asm/cacheflush.h | 14 +++++++-------
>  1 file changed, 7 insertions(+), 7 deletions(-)
>
> diff --git a/arch/riscv/include/asm/cacheflush.h b/arch/riscv/include/asm/cacheflush.h
> index 555b20b11dc3..f6ec26589620 100644
> --- a/arch/riscv/include/asm/cacheflush.h
> +++ b/arch/riscv/include/asm/cacheflush.h
> @@ -80,13 +80,6 @@ static inline void flush_dcache_page(struct page *page)
>  		clear_bit(PG_dcache_clean, &page->flags);
>  }
>  
> -/*
> - * RISC-V doesn't have an instruction to flush parts of the instruction cache,
> - * so instead we just flush the whole thing.
> - */
> -#define flush_icache_range(start, end) flush_icache_all()
> -#define flush_icache_user_range(vma, pg, addr, len) flush_icache_all()
> -
>  #ifndef CONFIG_SMP
>  
>  #define flush_icache_all() local_flush_icache_all()
> @@ -99,6 +92,13 @@ void flush_icache_mm(struct mm_struct *mm, bool local);
>  
>  #endif /* CONFIG_SMP */
>  
> +/*
> + * RISC-V doesn't have an instruction to flush parts of the instruction cache,
> + * so instead we just flush the whole thing.
> + */
> +#define flush_icache_range(start, end) flush_icache_all()
> +#define flush_icache_user_range(vma, pg, addr, len) flush_icache_all()
> +
>  /*
>   * Bits in sys_riscv_flush_icache()'s flags argument.
>   */