linux-kernel - Re: [RFC 1/2] rwsem: introduce upgrade

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Message-ID: <20241017062343.81825-1-lizhe.67@bytedance.com>
Date: Thu, 17 Oct 2024 14:23:43 +0800
From: lizhe.67@...edance.com
To: willy@...radead.org
Cc: akpm@...ux-foundation.org,
	boqun.feng@...il.com,
	linux-kernel@...r.kernel.org,
	linux-mm@...ck.org,
	lizhe.67@...edance.com,
	longman@...hat.com,
	mingo@...hat.com,
	peterz@...radead.org,
	will@...nel.org
Subject: Re: [RFC 1/2] rwsem: introduce upgrade_read interface

On Wed, 16 Oct 2024 12:49:44 +0100, willy@...radead.org wrote:

>On Wed, Oct 16, 2024 at 12:35:59PM +0800, lizhe.67@...edance.com wrote:
>> +++ b/include/linux/rwsem.h
>> @@ -249,6 +249,7 @@ DEFINE_GUARD_COND(rwsem_write, _try, down_write_trylock(_T))
>>   * downgrade write lock to read lock
>>   */
>>  extern void downgrade_write(struct rw_semaphore *sem);
>> +extern int upgrade_read(struct rw_semaphore *sem);
>
>This needs __must_check, and I think this should be a bool, not an errno
>return.

I can't agree more. I will fix it in v2.

Thanks!