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Date: Tue, 27 Feb 2024 09:54:41 +0100
From: Greg KH <gregkh@linuxfoundation.org>
To: chengming.zhou@linux.dev
Cc: stable@vger.kernel.org, Chengming Zhou <zhouchengming@bytedance.com>,
	Johannes Weiner <hannes@cmpxchg.org>, Nhat Pham <nphamcs@gmail.com>,
	Yosry Ahmed <yosryahmed@google.com>,
	Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [PATCH] mm/zswap: invalidate duplicate entry when !zswap_enabled
Message-ID: <2024022728-phoenix-varsity-45e9@gregkh>
References: <2024022622-resent-ripeness-43f1@gregkh>
 <20240227022540.3441860-1-chengming.zhou@linux.dev>
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In-Reply-To: <20240227022540.3441860-1-chengming.zhou@linux.dev>

On Tue, Feb 27, 2024 at 02:25:40AM +0000, chengming.zhou@linux.dev wrote:
> From: Chengming Zhou <zhouchengming@bytedance.com>
> 
> We have to invalidate any duplicate entry even when !zswap_enabled since
> zswap can be disabled anytime.  If the folio store success before, then
> got dirtied again but zswap disabled, we won't invalidate the old
> duplicate entry in the zswap_store().  So later lru writeback may
> overwrite the new data in swapfile.
> 
> Link: https://lkml.kernel.org/r/20240208023254.3873823-1-chengming.zhou@linux.dev
> Fixes: 42c06a0e8ebe ("mm: kill frontswap")
> Signed-off-by: Chengming Zhou <zhouchengming@bytedance.com>
> Acked-by: Johannes Weiner <hannes@cmpxchg.org>
> Cc: Nhat Pham <nphamcs@gmail.com>
> Cc: Yosry Ahmed <yosryahmed@google.com>
> Cc: <stable@vger.kernel.org>
> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
> (cherry picked from commit 678e54d4bb9a4822f8ae99690ac131c5d490cdb1)

What tree is this for?

thanks,

greg k-h