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Date: Thu, 20 Feb 2003 10:40:17 -0800
From: Andrew Morton <akpm@digeo.com>
To: Hugh Dickins <hugh@veritas.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: [PATCH] umount versus iprune
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Hugh Dickins <hugh@veritas.com> wrote:
>
> When prune_icache coincides with unmounting, invalidate_inodes notices
> the inode it's working on as busy but doesn't wait: Self-destruct in 5
> seconds message, and later iput oopses on freed super_block.
> 
> Neither end is a fast path, so patch below just adds iprune_sem for
> exclusion: if you've got a neater solution, great - I shied away from
> games with i_state, and extending use of shrinker_sem felt like abuse.
> 

Sounds reasonable.  The semaphore will block kswapd, but the reason kswapd
is being blocked is so that someone else can free tons of memory, so shrug.

Is 2.4 affected?