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Fri, 23 Jan 2026 06:53:10 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id OJDONtYac2k4YgAAD6G6ig (envelope-from ); Fri, 23 Jan 2026 06:53:10 +0000 From: Vlastimil Babka Date: Fri, 23 Jan 2026 07:52:55 +0100 Subject: [PATCH v4 17/22] slab: remove unused PREEMPT_RT specific macros MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260123-sheaves-for-all-v4-17-041323d506f7@suse.cz> References: <20260123-sheaves-for-all-v4-0-041323d506f7@suse.cz> In-Reply-To: <20260123-sheaves-for-all-v4-0-041323d506f7@suse.cz> To: Harry Yoo , Petr Tesarik , Christoph Lameter , David Rientjes , Roman Gushchin Cc: Hao Li , Andrew Morton , Uladzislau Rezki , "Liam R. Howlett" , Suren Baghdasaryan , Sebastian Andrzej Siewior , Alexei Starovoitov , linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-rt-devel@lists.linux.dev, bpf@vger.kernel.org, kasan-dev@googlegroups.com, Vlastimil Babka X-Mailer: b4 0.14.3 X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: 8354E40003 X-Stat-Signature: 5sah6mpbts9oata4y1zfsszteenyg9n9 X-Rspam-User: X-HE-Tag: 1769151241-927907 X-HE-Meta: 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 edBQdZNR voaCPwaaB0QHAkyc8q0XNL5vkHbOFulKBesY7zDC8vrImZlTCPUdIHYjvThwHZuG83LN2FlmfzyvbThQE9el9QZsMHzOtVCXP/l3bkqzl4q/clE6EiTy6aY7WbitKzBrFVLuiQMvC405qRb7UnVSSlsMW8KUSmt+8sx+vQeNBcth0tNvnaHfVlWWe+qQwNtH+vg/Ky9e2o7GSrm1/PFX1ecSHPpUzXCsXC9BF+YPdfbZ8/WJctt+YtF94sfjTy6FIh58SqxeYmPsjRwV7eZgk+GB90FVQhrZWPcoW3yQr/e3lfN1APteWctXI3Q== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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: Hao Li Reviewed-by: Suren Baghdasaryan Reviewed-by: Harry Yoo Signed-off-by: Vlastimil Babka --- mm/slub.c | 24 +----------------------- 1 file changed, 1 insertion(+), 23 deletions(-) diff --git a/mm/slub.c b/mm/slub.c index 8ecd5766635b..1d135baf5e9e 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -201,28 +201,6 @@ enum slab_flags { SL_pfmemalloc = PG_active, /* Historical reasons for this bit */ }; -/* - * We could simply use migrate_disable()/enable() but as long as it's a - * function call even on !PREEMPT_RT, use inline preempt_disable() there. - */ -#ifndef CONFIG_PREEMPT_RT -#define slub_get_cpu_ptr(var) get_cpu_ptr(var) -#define slub_put_cpu_ptr(var) put_cpu_ptr(var) -#define USE_LOCKLESS_FAST_PATH() (true) -#else -#define slub_get_cpu_ptr(var) \ -({ \ - migrate_disable(); \ - this_cpu_ptr(var); \ -}) -#define slub_put_cpu_ptr(var) \ -do { \ - (void)(var); \ - migrate_enable(); \ -} while (0) -#define USE_LOCKLESS_FAST_PATH() (false) -#endif - #ifndef CONFIG_SLUB_TINY #define __fastpath_inline __always_inline #else @@ -713,7 +691,7 @@ static inline bool __slab_update_freelist(struct kmem_cache *s, struct slab *sla { bool ret; - if (USE_LOCKLESS_FAST_PATH()) + if (!IS_ENABLED(CONFIG_PREEMPT_RT)) lockdep_assert_irqs_disabled(); if (s->flags & __CMPXCHG_DOUBLE) -- 2.52.0