can kfree sleep?

[Peter T. Breuer]

Just a question: can kfree sleep?

I believe so, but slab.c does not enlighten me immediately:

 void
 kfree (const void *objp)
 {
        kmem_cache_t *c;
        unsigned long flags;

        if (!objp)
                return;
        local_irq_save (flags);
        c = GET_PAGE_CACHE (virt_to_page (objp));
        __cache_free (c, (void *) objp);
        local_irq_restore (flags);
 }

 static inline void __cache_free (kmem_cache_t *cachep, void* objp)
 {
        struct array_cache *ac = ac_data(cachep);

        check_irq_off();
        objp = cache_free_debugcheck(cachep, objp, __builtin_return_address(0));

        if (likely(ac->avail < ac->limit)) {
                STATS_INC_FREEHIT(cachep);
                ac_entry(ac)[ac->avail++] = objp;
                return;
        } else {
                STATS_INC_FREEMISS(cachep);
                cache_flusharray(cachep, ac);
                ac_entry(ac)[ac->avail++] = objp;
        }
 }

 ...


Peter
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