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git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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: Hao Li <hao.li@linux.dev>
Reviewed-by: Suren Baghdasaryan <surenb@google.com>
Reviewed-by: Harry Yoo <harry.yoo@oracle.com>
Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
+1
-23
+1
-23
mm/slub.c
+1
-23
mm/slub.c
···
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SL_pfmemalloc = PG_active, /* Historical reasons for this bit */
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};
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-
/*
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* We could simply use migrate_disable()/enable() but as long as it's a
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* function call even on !PREEMPT_RT, use inline preempt_disable() there.
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*/
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#ifndef CONFIG_PREEMPT_RT
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#define slub_get_cpu_ptr(var) get_cpu_ptr(var)
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#define slub_put_cpu_ptr(var) put_cpu_ptr(var)
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#define USE_LOCKLESS_FAST_PATH() (true)
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#else
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#define slub_get_cpu_ptr(var) \
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({ \
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migrate_disable(); \
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this_cpu_ptr(var); \
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})
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#define slub_put_cpu_ptr(var) \
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do { \
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(void)(var); \
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migrate_enable(); \
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} while (0)
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#define USE_LOCKLESS_FAST_PATH() (false)
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#endif
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-
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#ifndef CONFIG_SLUB_TINY
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#define __fastpath_inline __always_inline
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#else
···
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{
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bool ret;
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if (USE_LOCKLESS_FAST_PATH())
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+
if (!IS_ENABLED(CONFIG_PREEMPT_RT))
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lockdep_assert_irqs_disabled();
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if (s->flags & __CMPXCHG_DOUBLE)