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mm/slub: Convert __slab_lock() and __slab_unlock() to struct slab 

These functions operate on the PG_locked page flag, but make them accept
struct slab to encapsulate this implementation detail.

Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
Reviewed-by: Roman Gushchin <guro@fb.com>
This commit is contained in:
Vlastimil Babka 2021-10-26 13:39:14 +02:00
parent d835eef4fc
commit 0393895b09
1 changed files with 11 additions and 7 deletions
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18
mm/slub.c
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@ -440,14 +440,18 @@ slub_set_cpu_partial(struct kmem_cache *s, unsigned int nr_objects)
/*
* Per slab locking using the pagelock
*/
static __always_inline void __slab_lock(struct page *page)
static __always_inline void __slab_lock(struct slab *slab)
{
struct page *page = slab_page(slab);
VM_BUG_ON_PAGE(PageTail(page), page);
bit_spin_lock(PG_locked, &page->flags);
}
static __always_inline void __slab_unlock(struct page *page)
static __always_inline void __slab_unlock(struct slab *slab)
{
struct page *page = slab_page(slab);
VM_BUG_ON_PAGE(PageTail(page), page);
__bit_spin_unlock(PG_locked, &page->flags);
}
@ -456,12 +460,12 @@ static __always_inline void slab_lock(struct page *page, unsigned long *flags)
{
if (IS_ENABLED(CONFIG_PREEMPT_RT))
local_irq_save(*flags);
__slab_lock(page);
__slab_lock(page_slab(page));
}
static __always_inline void slab_unlock(struct page *page, unsigned long *flags)
{
__slab_unlock(page);
__slab_unlock(page_slab(page));
if (IS_ENABLED(CONFIG_PREEMPT_RT))
local_irq_restore(*flags);
}
@ -530,16 +534,16 @@ static inline bool cmpxchg_double_slab(struct kmem_cache *s, struct page *page,
unsigned long flags;
local_irq_save(flags);
__slab_lock(page);
__slab_lock(page_slab(page));
if (page->freelist == freelist_old &&
page->counters == counters_old) {
page->freelist = freelist_new;
page->counters = counters_new;
__slab_unlock(page);
__slab_unlock(page_slab(page));
local_irq_restore(flags);
return true;
}
__slab_unlock(page);
__slab_unlock(page_slab(page));
local_irq_restore(flags);
}