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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-Spamd-Result: default: False [-4.51 / 50.00]; BAYES_HAM(-3.00)[100.00%]; NEURAL_HAM_LONG(-1.00)[-1.000]; R_DKIM_ALLOW(-0.20)[suse.cz:s=susede2_rsa,suse.cz:s=susede2_ed25519]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; MX_GOOD(-0.01)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; DKIM_SIGNED(0.00)[suse.cz:s=susede2_rsa,suse.cz:s=susede2_ed25519]; FREEMAIL_ENVRCPT(0.00)[gmail.com]; FUZZY_RATELIMITED(0.00)[rspamd.com]; RBL_SPAMHAUS_BLOCKED_OPENRESOLVER(0.00)[2a07:de40:b281:104:10:150:64:97:from]; MIME_TRACE(0.00)[0:+]; ARC_NA(0.00)[]; FREEMAIL_CC(0.00)[linux.dev,linux-foundation.org,gmail.com,oracle.com,google.com,linutronix.de,kernel.org,kvack.org,vger.kernel.org,lists.linux.dev,googlegroups.com,suse.cz]; DKIM_TRACE(0.00)[suse.cz:+]; RCPT_COUNT_TWELVE(0.00)[18]; RCVD_COUNT_TWO(0.00)[2]; FROM_EQ_ENVFROM(0.00)[]; FROM_HAS_DN(0.00)[]; RCVD_TLS_ALL(0.00)[]; DNSWL_BLOCKED(0.00)[2a07:de40:b281:106:10:150:64:167:received]; RECEIVED_SPAMHAUS_BLOCKED_OPENRESOLVER(0.00)[2a07:de40:b281:106:10:150:64:167:received]; MID_RHS_MATCH_FROM(0.00)[]; R_RATELIMIT(0.00)[to(RL941jgdop1fyjkq8h4),to_ip_from(RLfsjnp7neds983g95ihcnuzgq)]; RCVD_VIA_SMTP_AUTH(0.00)[]; TO_DN_SOME(0.00)[] X-Spam-Flag: NO X-Spam-Score: -4.51 X-Rspamd-Queue-Id: 6908E337D0 X-Rspamd-Action: no action X-Rspamd-Server: rspamd2.dmz-prg2.suse.org X-Spam-Level: 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 Reviewed-by: Hao Li Reviewed-by: Harry Yoo --- 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 =3D PG_active, /* Historical reasons for this bit */ }; =20 -/* - * 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_c= ache *s, struct slab *sla { bool ret; =20 - if (USE_LOCKLESS_FAST_PATH()) + if (!IS_ENABLED(CONFIG_PREEMPT_RT)) lockdep_assert_irqs_disabled(); =20 if (s->flags & __CMPXCHG_DOUBLE) --=20 2.52.0