linux-kernel - Re: [PATCH v3 16/21] slab: remove unused PREEMPT

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Message-ID: <v6govsosryla4nzgzbfo3eeiziabn2tdprzhg3zcpoxkxq622f@2ra34j7326mn>
Date: Wed, 21 Jan 2026 14:42:49 +0800
From: Hao Li <hao.li@...ux.dev>
To: Vlastimil Babka <vbabka@...e.cz>
Cc: Harry Yoo <harry.yoo@...cle.com>, Petr Tesarik <ptesarik@...e.com>, 
	Christoph Lameter <cl@...two.org>, David Rientjes <rientjes@...gle.com>, 
	Roman Gushchin <roman.gushchin@...ux.dev>, Andrew Morton <akpm@...ux-foundation.org>, 
	Uladzislau Rezki <urezki@...il.com>, "Liam R. Howlett" <Liam.Howlett@...cle.com>, 
	Suren Baghdasaryan <surenb@...gle.com>, Sebastian Andrzej Siewior <bigeasy@...utronix.de>, 
	Alexei Starovoitov <ast@...nel.org>, linux-mm@...ck.org, linux-kernel@...r.kernel.org, 
	linux-rt-devel@...ts.linux.dev, bpf@...r.kernel.org, kasan-dev@...glegroups.com
Subject: Re: [PATCH v3 16/21] slab: remove unused PREEMPT_RT specific macros

On Fri, Jan 16, 2026 at 03:40:36PM +0100, Vlastimil Babka wrote:
> The macros slub_get_cpu_ptr()/slub_put_cpu_ptr() are now unused, remove
> them. USE_LOCKLESS_FAST_PATH() has lost its true meaning with the code
> being removed. The only remaining usage is in fact testing whether we
> can assert irqs disabled, because spin_lock_irqsave() only does that on
> !RT. Test for CONFIG_PREEMPT_RT instead.
> 
> Reviewed-by: Suren Baghdasaryan <surenb@...gle.com>
> Signed-off-by: Vlastimil Babka <vbabka@...e.cz>
> ---
>  mm/slub.c | 24 +-----------------------
>  1 file changed, 1 insertion(+), 23 deletions(-)
> 

Looks good to me.
Reviewed-by: Hao Li <hao.li@...ux.dev>

-- 
Thanks,
Hao