linux-kernel - Re: [PATCH 4.19 092/229] once: add DO_ONCE

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Date:   Tue, 1 Nov 2022 07:25:38 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Yongqin Liu <yongqin.liu@...aro.org>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Eric Dumazet <edumazet@...gle.com>, Willy Tarreau <w@....eu>,
        "David S. Miller" <davem@...emloft.net>,
        Sasha Levin <sashal@...nel.org>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        Benjamin Copeland <ben.copeland@...aro.org>,
        Daniel Díaz <daniel.diaz@...aro.org>
Subject: Re: [PATCH 4.19 092/229] once: add DO_ONCE_SLOW() for sleepable
 contexts

On Tue, Nov 01, 2022 at 02:07:35PM +0800, Yongqin Liu wrote:
> Hello,
> 
> As mentioned in the thread for the 5.4 version here[1], it causes a
> crash for the 4.19 kernel too.
> Just paste the log here for reference:

Can you try this patch please:


diff --git a/include/linux/once.h b/include/linux/once.h
index bb58e1c3aa03..3a6671d961b9 100644
--- a/include/linux/once.h
+++ b/include/linux/once.h
@@ -64,7 +64,7 @@ void __do_once_slow_done(bool *done, struct static_key_true *once_key,
 #define DO_ONCE_SLOW(func, ...)						     \
 	({								     \
 		bool ___ret = false;					     \
-		static bool __section(".data.once") ___done = false;	     \
+		static bool __section(.data.once) ___done = false;	     \
 		static DEFINE_STATIC_KEY_TRUE(___once_key);		     \
 		if (static_branch_unlikely(&___once_key)) {		     \
 			___ret = __do_once_slow_start(&___done);	     \