kernel-hardening - Re: [RFC PATCH 09/21] list: Remove unnecessary WRITE_ONCE() from hlist_bl_add

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Message-ID: <20200331123733.GB30061@willie-the-truck>
Date: Tue, 31 Mar 2020 13:37:34 +0100
From: Will Deacon <will@...nel.org>
To: "Paul E. McKenney" <paulmck@...nel.org>
Cc: linux-kernel@...r.kernel.org, Eric Dumazet <edumazet@...gle.com>,
	Jann Horn <jannh@...gle.com>, Kees Cook <keescook@...omium.org>,
	Maddie Stone <maddiestone@...gle.com>,
	Marco Elver <elver@...gle.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>, kernel-team@...roid.com,
	kernel-hardening@...ts.openwall.com
Subject: Re: [RFC PATCH 09/21] list: Remove unnecessary WRITE_ONCE() from
 hlist_bl_add_before()

On Mon, Mar 30, 2020 at 04:30:20PM -0700, Paul E. McKenney wrote:
> On Tue, Mar 24, 2020 at 03:36:31PM +0000, Will Deacon wrote:
> > There is no need to use WRITE_ONCE() when inserting into a non-RCU
> > protected list.
> > 
> > Cc: Paul E. McKenney <paulmck@...nel.org>
> > Cc: Peter Zijlstra <peterz@...radead.org>
> > Signed-off-by: Will Deacon <will@...nel.org>
> 
> OK, I will bite...  Why "unsigned long" instead of "uintptr_t"?

I just did that for consistency with the rest of the file, e.g.
hlist_bl_first(), hlist_bl_set_first(), hlist_bl_empty() and
__hlist_bl_del() all cast to 'unsigned long', yet only
hlist_bl_add_before() was using 'uintptr_t'

> Not that it matters in the context of the Linux kernel, so:
> 
> Reviewed-by: Paul E. McKenney <paulmck@...nel.org>

Thanks, Paul!

Will

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