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Message-ID: <20250430152554.23646-1-jarkko@kernel.org>
Date: Wed, 30 Apr 2025 18:25:53 +0300
From: Jarkko Sakkinen <jarkko@...nel.org>
To: keyrings@...r.kernel.org
Cc: Jarkko Sakkinen <jarkko@...nel.org>,
David Howells <dhowells@...hat.com>,
Lukas Wunner <lukas@...ner.de>,
Ignat Korchagin <ignat@...udflare.com>,
Herbert Xu <herbert@...dor.apana.org.au>,
"David S. Miller" <davem@...emloft.net>,
Peter Huewe <peterhuewe@....de>,
Jason Gunthorpe <jgg@...pe.ca>,
Paul Moore <paul@...l-moore.com>,
James Morris <jmorris@...ei.org>,
"Serge E. Hallyn" <serge@...lyn.com>,
James Bottomley <James.Bottomley@...senPartnership.com>,
Mimi Zohar <zohar@...ux.ibm.com>,
linux-crypto@...r.kernel.org,
linux-kernel@...r.kernel.org,
linux-integrity@...r.kernel.org,
linux-security-module@...r.kernel.org
Subject: [PATCH] KEYS: Reduce smp_mb() calls in key_put()
Rely only on the memory ordering of spin_unlock() when setting
KEY_FLAG_FINAL_PUT under key->user->lock in key_put().
Signed-off-by: Jarkko Sakkinen <jarkko@...nel.org>
---
security/keys/key.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/security/keys/key.c b/security/keys/key.c
index 7198cd2ac3a3..aecbd624612d 100644
--- a/security/keys/key.c
+++ b/security/keys/key.c
@@ -656,10 +656,12 @@ void key_put(struct key *key)
spin_lock_irqsave(&key->user->lock, flags);
key->user->qnkeys--;
key->user->qnbytes -= key->quotalen;
+ set_bit(KEY_FLAG_FINAL_PUT, &key->flags);
spin_unlock_irqrestore(&key->user->lock, flags);
+ } else {
+ set_bit(KEY_FLAG_FINAL_PUT, &key->flags);
+ smp_mb(); /* key->user before FINAL_PUT set. */
}
- smp_mb(); /* key->user before FINAL_PUT set. */
- set_bit(KEY_FLAG_FINAL_PUT, &key->flags);
schedule_work(&key_gc_work);
}
}
--
2.47.2
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