linux-kernel - Re: [PATCH 2/2] mm/vmalloc: Use __this_cpu_try_cmpxchg() in preload_this_cpu

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Message-ID: <ZlXk0EyoGDf80Ild@pc636>
Date: Tue, 28 May 2024 16:06:08 +0200
From: Uladzislau Rezki <urezki@...il.com>
To: Uros Bizjak <ubizjak@...il.com>
Cc: linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Uladzislau Rezki <urezki@...il.com>,
	Christoph Hellwig <hch@...radead.org>,
	Lorenzo Stoakes <lstoakes@...il.com>,
	Dennis Zhou <dennis@...nel.org>, Tejun Heo <tj@...nel.org>,
	Christoph Lameter <cl@...ux.com>
Subject: Re: [PATCH 2/2] mm/vmalloc: Use __this_cpu_try_cmpxchg() in
 preload_this_cpu_lock()

> Use __this_cpu_try_cmpxchg() instead of
> __this_cpu_cmpxchg (*ptr, old, new) == old in
> preload_this_cpu_lock().  x86 CMPXCHG instruction returns
> success in ZF flag, so this change saves a compare after cmpxchg.
> 
Just a small note. Can you also add a tiny difference in assembly
language where it is visible? I mean update a commit message.

--
Uladzislau Rezki