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Fri, 16 Jan 2026 14:40:38 +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 oFrAEuZNamnydgAAD6G6ig (envelope-from ); Fri, 16 Jan 2026 14:40:38 +0000 From: Vlastimil Babka Date: Fri, 16 Jan 2026 15:40:36 +0100 Subject: [PATCH v3 16/21] slab: remove unused PREEMPT_RT specific macros MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260116-sheaves-for-all-v3-16-5595cb000772@suse.cz> References: <20260116-sheaves-for-all-v3-0-5595cb000772@suse.cz> In-Reply-To: <20260116-sheaves-for-all-v3-0-5595cb000772@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-Action: no action X-Rspam-User: X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: 6FF99100014 X-Stat-Signature: 7xekirrqrhzx4fnm8wdhe5ken34s1k8q X-HE-Tag: 1768574492-91690 X-HE-Meta: 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 Ud9MZxNv /pWVN2tkKxsR7xER3SKnjtx/Hq/PuTHXAr44rZKiO5kshbVViHz6D7QudoQk65zX8tTLy0SBTX6EN/Xhe8BU/HNzOGIwY8m+zlmxDQ+NFVQmyPFhd1a407GC5jGPJti3d9Kn7kf/lpl4lHJ356RrcsFho8o0sDnVNKXnucmtnlSG4T0JaZ0otFe4r3HZsdPx9w+OTJv8vaTr9kqBu6EgFv+T7bZ11JtzjztPC3P55iiPVsJ18Jo2Yu4pIWX56mq9LVzRW2BQ7UlUeIC50OhKM3FmKkQ== 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: Suren Baghdasaryan 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 bb72cfa2d7ec..d52de6e3c2d5 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 @@ -719,7 +697,7 @@ 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