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Mon, 12 Jan 2026 15:16:59 +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 +GoZAWsQZWn7FgAAD6G6ig (envelope-from ); Mon, 12 Jan 2026 15:16:59 +0000 From: Vlastimil Babka Date: Mon, 12 Jan 2026 16:17:09 +0100 Subject: [PATCH RFC v2 15/20] slab: remove unused PREEMPT_RT specific macros MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260112-sheaves-for-all-v2-15-98225cfb50cf@suse.cz> References: <20260112-sheaves-for-all-v2-0-98225cfb50cf@suse.cz> In-Reply-To: <20260112-sheaves-for-all-v2-0-98225cfb50cf@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: rspam12 X-Rspamd-Queue-Id: 43AD9100005 X-Stat-Signature: nzehu54gbatjso7zhkqpkrud15fg8thx X-Rspam-User: X-HE-Tag: 1768231061-161350 X-HE-Meta: U2FsdGVkX1/S6mBE1EUPIRQMjbmRzdX6WbDn1He/1d7P9nfAtqo0e0uVoTjXNhD/26s99Mp0tpg8+9FqjBjB2qenSuN+ssLZirLJHs+XOcpyS8brQAXDOM9Z8DbaSkNsH5OWbLTu7oxfh6UOS3+cel2T6WEJIkqOoXrHhZI5cs77wYLUd9pxJmgA+PlTJzIjvS7ZRMXvnd0wuGTDfdNP3lUr0gnK2b9seGLq6354edbN7m8dq4loYKZGIgq5wjN04rOGzPp0/DTYr/K753zYlr06/NgU8BQKKbkUqPKXEJD+M1OwC/q14iXVi2Mr7V2JM8qHwmFs2+nnyG/glSB94gL8YV1fEdRCjopT8+lZHYhPiETPtpvJcmF6fVur/TJsu3sV8SZ2Q3Eseab+x/MHsT0MUtFF3MK2rFlthgDGQTTL+t0ntueV5Bi3JCMBrqrHF5B6lLj9Swa7Ib5zOdvl6DRVvdlQdeNJTgGLGVVPbUlVi+YWnumaScCj57aa0HUQybHOyqiBVh9kMnPVGQLMVv965VwuFapa/u3PbR/1PpU28/dFBv2yG/8qWhdz2LVwkOR91MhfFzs1oBX9Eul1dfH1cd8642L3RnEFsyaL/7fO8zb1FulAaJZVbh+K9xyPoa0ZGwz/5NkZtcULL26D+o2RwahaqkL37Z6wE9ojqAc1rr1LdZHrbykfB/jIn7MV6LlK6UU07tKHf+B82rYECqivqNi84sUbvwGMeUJRZRwAiKMK71MNwDDEZHfoJ3zxXMbBgxZkvkv43f/X59sBHp2QCJRFyJJlpSckC09V7X+ld1dSsN6PcHvc6WAfQn0StMGAYRd7TBs/EhVl/1+7wkmuNXM0nou5Q+reE3ka/b0OjXHSeM+Q+EjEDk3m+R/NmhwYS/CCHVMP1uIpvTZXs4Z6C24/YvcP6zZHFo1HYuAjd7UBUkNMaitu4k8+ILVc2N7XbGn4kxhDXwSKTC8 O1+jj4+M nLUufT6U4Q20+FCB5hRMBv9ytxVFM9supD8yGZeBZq4zYx09XrG3wvPRJxvOwGUDPNw6gE94wKPmgqC2hjvxv3kXJVfGQ7xj6omopzKyQ8L77+cZ10xHEu2I3cuAPaufzYvCziKX1GtoOqrXRRt5NdadcgHNaIVOTi1bR2izqN3ojM2SDNe0Tqq59RzIatBn6PYyv1IHGR3YDyllG5dO/B8K3tct9iDpNs7pZwucMRq4YEgUlq9vkH5EIqAVYGqfavJBN 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. 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 882f607fb4ad..088b4f6f81fa 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 @@ -707,7 +685,7 @@ 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