slob: sparsemem support

Currently slob is disabled if we're using sparsemem, due to an earlier patch from Goto-san. Slob and static sparsemem work without any trouble as it is, and the only hiccup is a missing slab_is_available() in the case of sparsemem extreme. With this, we're rid of the last set of restrictions for slob usage. Signed-off-by: Paul Mundt <[email protected]> Acked-by: Pekka Enberg <[email protected]> Acked-by: Matt Mackall <[email protected]> Cc: Christoph Lameter <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
iegor · Jul 16, 2007 · 84a01c2 · 84a01c2
1 parent 5dc4ac6
commit 84a01c2
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diff --git a/init/Kconfig b/init/Kconfig
@@ -576,7 +576,7 @@ config SLUB
 	   and has enhanced diagnostics.
 
 config SLOB
-	depends on EMBEDDED && !SPARSEMEM
+	depends on EMBEDDED
 	bool "SLOB (Simple Allocator)"
 	help
 	   SLOB replaces the SLAB allocator with a drastically simpler

diff --git a/mm/slob.c b/mm/slob.c
@@ -634,6 +634,14 @@ int kmem_ptr_validate(struct kmem_cache *a, const void *b)
 	return 0;
 }
 
+static unsigned int slob_ready __read_mostly;
+
+int slab_is_available(void)
+{
+	return slob_ready;
+}
+
 void __init kmem_cache_init(void)
 {
+	slob_ready = 1;
 }