linux-kernel - Re: [PATCH v3 3/3] mm: introduce mmap_lock_speculate_{try

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Message-ID: <20241125165357.GA16789@noisy.programming.kicks-ass.net>
Date: Mon, 25 Nov 2024 17:53:57 +0100
From: Peter Zijlstra <peterz@...radead.org>
To: Suren Baghdasaryan <surenb@...gle.com>
Cc: Wei Yang <richard.weiyang@...il.com>, akpm@...ux-foundation.org,
	andrii@...nel.org, jannh@...gle.com, Liam.Howlett@...cle.com,
	lorenzo.stoakes@...cle.com, vbabka@...e.cz, mhocko@...nel.org,
	shakeel.butt@...ux.dev, hannes@...xchg.org, david@...hat.com,
	willy@...radead.org, brauner@...nel.org, oleg@...hat.com,
	arnd@...db.de, zhangpeng.00@...edance.com, linmiaohe@...wei.com,
	viro@...iv.linux.org.uk, hca@...ux.ibm.com, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 3/3] mm: introduce
 mmap_lock_speculate_{try_begin|retry}

On Mon, Nov 25, 2024 at 08:18:38AM -0800, Suren Baghdasaryan wrote:

> > >+static inline bool mmap_lock_speculate_retry(struct mm_struct *mm, unsigned int seq)
> > >+{
> > >+      return do_read_seqcount_retry(&mm->mm_lock_seq, seq);
> >
> > Just curious why we don't use read_seqcount_retry().
> >
> > Looks this is the only user outside seqlock.h.
> 
> Ah, good eye! read_seqcount_retry() would be better.
> 
> Peter, do you want me to post a new patchset or you can patch it when
> picking it up?

Fixed up my local copy, thanks!