[PATCH] SLOB allocator imcompatible SLAB

[Yoshinori Sato]

Because the page which SLOB allocator got does not have PG_slab,
I put back the result that kobjsize made a mistake in.

allocateしたページにPG_slabを付ける必要があるのでは無いでしょうか。
I need to add PG_slab to the allocate page, and will not there be it?

Signed-off-by: Yoshinori Sato <[EMAIL PROTECTED]>

diff --git a/mm/slob.c b/mm/slob.c
index 71976c5..d10bcda 100644
--- a/mm/slob.c
+++ b/mm/slob.c
@@ -73,6 +73,21 @@ static DEFINE_SPINLOCK(block_lock);
 static void slob_free(void *b, int size);
 static void slob_timer_cbk(void);
 
+static inline void set_slabflags(const void *ptr, int order)
+{
+       int i;
+       struct page *page = virt_to_page(ptr);
+       for (i = 0; i < (1 << order); i++)
+               __SetPageSlab(page++);
+}
+
+static inline void clear_slabflags(const void *ptr, int order)
+{
+       int i;
+       struct page *page = virt_to_page(ptr);
+       for (i = 0; i < (1 << order); i++)
+               __ClearPageSlab(page++);
+}
 
 static void *slob_alloc(size_t size, gfp_t gfp, int align)
 {
@@ -180,6 +195,7 @@ void *__kmalloc(size_t size, gfp_t gfp)
        bb->pages = (void *)__get_free_pages(gfp, bb->order);
 
        if (bb->pages) {
+               set_slabflags(bb->pages, bb->order);
                spin_lock_irqsave(&block_lock, flags);
                bb->next = bigblocks;
                bigblocks = bb;
@@ -240,6 +256,7 @@ void kfree(const void *block)
                        if (bb->pages == block) {
                                *last = bb->next;
                                spin_unlock_irqrestore(&block_lock, flags);
+                               clear_slabflags(block, bb->order);
                                free_pages((unsigned long)block, bb->order);
                                slob_free(bb, sizeof(bigblock_t));
                                return;
@@ -323,9 +340,11 @@ void *kmem_cache_alloc(struct kmem_cache *c, gfp_t flags)
 
        if (c->size < PAGE_SIZE)
                b = slob_alloc(c->size, flags, c->align);
-       else
+       else {
                b = (void *)__get_free_pages(flags, get_order(c->size));
-
+               if (b)
+                       set_slabflags(b, get_order(c->size));
+       }
        if (c->ctor)
                c->ctor(b, c, 0);
 
@@ -347,8 +366,10 @@ static void __kmem_cache_free(void *b, int size)
 {
        if (size < PAGE_SIZE)
                slob_free(b, size);
-       else
+       else {
+               clear_slabflags(b, get_order(size));
                free_pages((unsigned long)b, get_order(size));
+       }
 }
 
 static void kmem_rcu_free(struct rcu_head *head)

-- 
Yoshinori Sato
<[EMAIL PROTECTED]>
-
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