linux-kernel - Re: [PATCH] uprobes: Use better bitmap

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Date:   Mon, 31 May 2021 08:54:15 +0800
From:   Kefeng Wang <wangkefeng.wang@...wei.com>
To:     <linux-kernel@...r.kernel.org>
CC:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>
Subject: Re: [PATCH] uprobes: Use better bitmap_zalloc()

sorry for the mistake,  will fix.

On 2021/5/29 19:15, Kefeng Wang wrote:
> Use better bitmap_zalloc() to allocate bitmap.
>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: Ingo Molnar <mingo@...hat.com>
> Cc: Arnaldo Carvalho de Melo <acme@...nel.org>
> Cc: Mark Rutland <mark.rutland@....com>
> Signed-off-by: Kefeng Wang <wangkefeng.wang@...wei.com>
> ---
>   kernel/events/uprobes.c | 7 +++----
>   1 file changed, 3 insertions(+), 4 deletions(-)
>
> diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
> index 907d4ee00cb2..8160d2e53219 100644
> --- a/kernel/events/uprobes.c
> +++ b/kernel/events/uprobes.c
> @@ -1487,8 +1487,7 @@ static struct xol_area *__create_xol_area(unsigned long vaddr)
>   	if (unlikely(!area))
>   		goto out;
>   
> -	area->bitmap = kcalloc(BITS_TO_LONGS(UINSNS_PER_PAGE), sizeof(long),
> -			       GFP_KERNEL);
> +	area->bitmap = bitmap_kzalloc(UINSNS_PER_PAGE, GFP_KERNEL);
>   	if (!area->bitmap)
>   		goto free_area;
>   
> @@ -1512,7 +1511,7 @@ static struct xol_area *__create_xol_area(unsigned long vaddr)
>   
>   	__free_page(area->pages[0]);
>    free_bitmap:
> -	kfree(area->bitmap);
> +	bitmap_kfree(area->bitmap);
>    free_area:
>   	kfree(area);
>    out:
> @@ -1553,7 +1552,7 @@ void uprobe_clear_state(struct mm_struct *mm)
>   		return;
>   
>   	put_page(area->pages[0]);
> -	kfree(area->bitmap);
> +	bitmap_kfree(area->bitmap);
>   	kfree(area);
>   }
>