linux-kernel - Re: [PATCH v4 12/22] lib/stackdepot: use read/write lock

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Date: Sat, 13 Jan 2024 01:31:08 -0800
From: Andi Kleen <ak@...ux.intel.com>
To: Marco Elver <elver@...gle.com>
Cc: Andrey Konovalov <andreyknvl@...il.com>,
	Oscar Salvador <osalvador@...e.de>, andrey.konovalov@...ux.dev,
	Andrew Morton <akpm@...ux-foundation.org>,
	Alexander Potapenko <glider@...gle.com>,
	Dmitry Vyukov <dvyukov@...gle.com>,
	Vlastimil Babka <vbabka@...e.cz>, kasan-dev@...glegroups.com,
	Evgenii Stepanov <eugenis@...gle.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Andrey Konovalov <andreyknvl@...gle.com>
Subject: Re: [PATCH v4 12/22] lib/stackdepot: use read/write lock

> This function is only refilling the freelist. Readers don't see it yet
> because it's in none of the hash table buckets. The freelist is only
> ever accessed under the lock.
> 
> Once an entry is allocated from the freelist, its size is overwritten
> with something non-zero (since it then contains a stack trace). Those
> updates are released into the right hash table bucket with
> list_add_rcu() (which implies a release).
> 
> Am I missing something else?

It's probably ok semantically here, but at least I would be consistent with
using the macro for a specific field.

-Andi