linux-kernel - Re: [PATCH v2 4/4] perf/core: use vma_is_initial_stack() and vma_is_initial

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Date:   Wed, 19 Jul 2023 10:21:11 +0200
From:   David Hildenbrand <david@...hat.com>
To:     Kefeng Wang <wangkefeng.wang@...wei.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-mm@...ck.org, linux-perf-users@...r.kernel.org,
        selinux@...r.kernel.org, Peter Zijlstra <peterz@...radead.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>
Subject: Re: [PATCH v2 4/4] perf/core: use vma_is_initial_stack() and
 vma_is_initial_heap()

On 19.07.23 09:51, Kefeng Wang wrote:
> Use the helpers to simplify code, also kill unneeded goto cpy_name.
> 
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: Arnaldo Carvalho de Melo <acme@...nel.org>
> Signed-off-by: Kefeng Wang <wangkefeng.wang@...wei.com>
> ---
>   kernel/events/core.c | 22 +++++++---------------
>   1 file changed, 7 insertions(+), 15 deletions(-)
> 
> diff --git a/kernel/events/core.c b/kernel/events/core.c
> index 78ae7b6f90fd..d59f6327472f 100644
> --- a/kernel/events/core.c
> +++ b/kernel/events/core.c
> @@ -8685,22 +8685,14 @@ static void perf_event_mmap_event(struct perf_mmap_event *mmap_event)
>   		}
>   
>   		name = (char *)arch_vma_name(vma);
> -		if (name)
> -			goto cpy_name;
> -
> -		if (vma->vm_start <= vma->vm_mm->start_brk &&
> -				vma->vm_end >= vma->vm_mm->brk) {
> -			name = "[heap]";
> -			goto cpy_name;
> +		if (!name) {
> +			if (vma_is_initial_heap(vma))
> +				name = "[heap]";
> +			else if (vma_is_initial_stack(vma))
> +				name = "[stack]";
> +			else
> +				name = "//anon";
>   		}
> -		if (vma->vm_start <= vma->vm_mm->start_stack &&
> -				vma->vm_end >= vma->vm_mm->start_stack) {
> -			name = "[stack]";
> -			goto cpy_name;
> -		}
> -
> -		name = "//anon";
> -		goto cpy_name;

If you're removing that goto, maybe also worth removing the goto at the 
end of the previous if branch.

Reviewed-by: David Hildenbrand <david@...hat.com>


-- 
Cheers,

David / dhildenb