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Date: Wed, 16 Sep 2026 17:59:39 -0700
From: Andrew Morton <akpm@linux-foundation.org>
To: Ye Liu <ye.liu@linux.dev>
Cc: Uladzislau Rezki <urezki@gmail.com>, linux-mm@kvack.org,
 linux-kernel@vger.kernel.org, Ye Liu <liuye@kylinos.cn>
Subject: Re: [PATCH 0/3] mm/vmalloc: fix vmalloc_dump_obj VA lookup
Message-Id: <20260916175939.01ecf1e866621427b7f09f21@linux-foundation.org>
In-Reply-To: <20260916-vmalloc_dump_obj-v1-0-7aa402d224df@linux.dev>
References: <20260916-vmalloc_dump_obj-v1-0-7aa402d224df@linux.dev>
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On Wed, 16 Sep 2026 16:25:27 +0800 Ye Liu <ye.liu@linux.dev> wrote:

> vmalloc_dump_obj() has two bugs that cause it to miss vmalloc
> allocations, plus a minor optimization opportunity:
> 
>   1. PAGE_ALIGN() rounds up, pushing last-page addresses to va_end
>      and outside the VA lookup range.
> 
>   2. The function searches only one vmap node, but allocations
>      larger than 64 KiB may span multiple vmap zones whose VA
>      is stored in a different node's rb-tree.
> 
> Patch 1 fixes the alignment, patch 2 fixes the cross-zone search,
> patch 3 adds an early is_vmalloc_addr() check to skip non-vmalloc
> addresses without traversing all nodes.
> 

Thanks.  Sashiko asked a thing:
	https://sashiko.dev/#/patchset/20260916-vmalloc_dump_obj-v1-0-7aa402d224df@linux.dev