[PATCH] optional ZONE_DMA: optional ZONE_DMA in the VM
Make ZONE_DMA optional in core code.
- ifdef all code for ZONE_DMA and related definitions following the example
for ZONE_DMA32 and ZONE_HIGHMEM.
- Without ZONE_DMA, ZONE_HIGHMEM and ZONE_DMA32 we get to a ZONES_SHIFT of
0.
- Modify the VM statistics to work correctly without a DMA zone.
- Modify slab to not create DMA slabs if there is no ZONE_DMA.
[[email protected]: cleanup]
[[email protected]: build fix]
[[email protected]: Simplify calculation of the number of bits we need for ZONES_SHIFT]
Signed-off-by: Christoph Lameter <[email protected]>
Cc: Andi Kleen <[email protected]>
Cc: "Luck, Tony" <[email protected]>
Cc: Kyle McMartin <[email protected]>
Cc: Matthew Wilcox <[email protected]>
Cc: James Bottomley <[email protected]>
Cc: Paul Mundt <[email protected]>
Signed-off-by: Andy Whitcroft <[email protected]>
Signed-off-by: Jeff Dike <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
diff --git a/include/linux/slab_def.h b/include/linux/slab_def.h
index 4b463e6..5e43646 100644
--- a/include/linux/slab_def.h
+++ b/include/linux/slab_def.h
@@ -19,7 +19,9 @@
struct cache_sizes {
size_t cs_size;
struct kmem_cache *cs_cachep;
+#ifdef CONFIG_ZONE_DMA
struct kmem_cache *cs_dmacachep;
+#endif
};
extern struct cache_sizes malloc_sizes[];
@@ -39,9 +41,12 @@
__you_cannot_kmalloc_that_much();
}
found:
- return kmem_cache_alloc((flags & GFP_DMA) ?
- malloc_sizes[i].cs_dmacachep :
- malloc_sizes[i].cs_cachep, flags);
+#ifdef CONFIG_ZONE_DMA
+ if (flags & GFP_DMA)
+ return kmem_cache_alloc(malloc_sizes[i].cs_dmacachep,
+ flags);
+#endif
+ return kmem_cache_alloc(malloc_sizes[i].cs_cachep, flags);
}
return __kmalloc(size, flags);
}
@@ -62,9 +67,12 @@
__you_cannot_kzalloc_that_much();
}
found:
- return kmem_cache_zalloc((flags & GFP_DMA) ?
- malloc_sizes[i].cs_dmacachep :
- malloc_sizes[i].cs_cachep, flags);
+#ifdef CONFIG_ZONE_DMA
+ if (flags & GFP_DMA)
+ return kmem_cache_zalloc(malloc_sizes[i].cs_dmacachep,
+ flags);
+#endif
+ return kmem_cache_zalloc(malloc_sizes[i].cs_cachep, flags);
}
return __kzalloc(size, flags);
}
@@ -88,9 +96,13 @@
__you_cannot_kmalloc_that_much();
}
found:
- return kmem_cache_alloc_node((flags & GFP_DMA) ?
- malloc_sizes[i].cs_dmacachep :
- malloc_sizes[i].cs_cachep, flags, node);
+#ifdef CONFIG_ZONE_DMA
+ if (flags & GFP_DMA)
+ return kmem_cache_alloc_node(malloc_sizes[i].cs_dmacachep,
+ flags, node);
+#endif
+ return kmem_cache_alloc_node(malloc_sizes[i].cs_cachep,
+ flags, node);
}
return __kmalloc_node(size, flags, node);
}
