Commit 6c2f307f authored by Vlastimil Babka's avatar Vlastimil Babka
Browse files

slab: remove unused PREEMPT_RT specific macros 



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: default avatarHao Li <hao.li@linux.dev>
Reviewed-by: default avatarSuren Baghdasaryan <surenb@google.com>
Reviewed-by: default avatarHarry Yoo <harry.yoo@oracle.com>
Signed-off-by: default avatarVlastimil Babka <vbabka@suse.cz>
parent 32c894c7

mm/slub.c

+1 −23
Original line number Diff line number Diff line
@@ -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)