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authorAl Viro <viro@zeniv.linux.org.uk>2005-10-21 02:55:38 -0400
committerLinus Torvalds <torvalds@g5.osdl.org>2005-10-28 08:16:46 -0700
commitaf4ca457eaf2d6682059c18463eb106e2ce58198 (patch)
tree399ca5ab3b15d723a6aefd04c764a2a06089ed06 /include/linux/gfp.h
parent434f1d10c1adb6c2e333d501ce1e42be610e0723 (diff)
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[PATCH] gfp_t: infrastructure
Beginning of gfp_t annotations: - -Wbitwise added to CHECKFLAGS - old __bitwise renamed to __bitwise__ - __bitwise defined to either __bitwise__ or nothing, depending on __CHECK_ENDIAN__ being defined - gfp_t switched from __nocast to __bitwise__ - force cast to gfp_t added to __GFP_... constants - new helper - gfp_zone(); extracts zone bits out of gfp_t value and casts the result to int Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/linux/gfp.h')
-rw-r--r--include/linux/gfp.h39
1 files changed, 20 insertions, 19 deletions
diff --git a/include/linux/gfp.h b/include/linux/gfp.h
index 3010e172394..c3779432a72 100644
--- a/include/linux/gfp.h
+++ b/include/linux/gfp.h
@@ -12,8 +12,8 @@ struct vm_area_struct;
* GFP bitmasks..
*/
/* Zone modifiers in GFP_ZONEMASK (see linux/mmzone.h - low two bits) */
-#define __GFP_DMA 0x01u
-#define __GFP_HIGHMEM 0x02u
+#define __GFP_DMA ((__force gfp_t)0x01u)
+#define __GFP_HIGHMEM ((__force gfp_t)0x02u)
/*
* Action modifiers - doesn't change the zoning
@@ -26,24 +26,24 @@ struct vm_area_struct;
*
* __GFP_NORETRY: The VM implementation must not retry indefinitely.
*/
-#define __GFP_WAIT 0x10u /* Can wait and reschedule? */
-#define __GFP_HIGH 0x20u /* Should access emergency pools? */
-#define __GFP_IO 0x40u /* Can start physical IO? */
-#define __GFP_FS 0x80u /* Can call down to low-level FS? */
-#define __GFP_COLD 0x100u /* Cache-cold page required */
-#define __GFP_NOWARN 0x200u /* Suppress page allocation failure warning */
-#define __GFP_REPEAT 0x400u /* Retry the allocation. Might fail */
-#define __GFP_NOFAIL 0x800u /* Retry for ever. Cannot fail */
-#define __GFP_NORETRY 0x1000u /* Do not retry. Might fail */
-#define __GFP_NO_GROW 0x2000u /* Slab internal usage */
-#define __GFP_COMP 0x4000u /* Add compound page metadata */
-#define __GFP_ZERO 0x8000u /* Return zeroed page on success */
-#define __GFP_NOMEMALLOC 0x10000u /* Don't use emergency reserves */
-#define __GFP_NORECLAIM 0x20000u /* No realy zone reclaim during allocation */
-#define __GFP_HARDWALL 0x40000u /* Enforce hardwall cpuset memory allocs */
+#define __GFP_WAIT ((__force gfp_t)0x10u) /* Can wait and reschedule? */
+#define __GFP_HIGH ((__force gfp_t)0x20u) /* Should access emergency pools? */
+#define __GFP_IO ((__force gfp_t)0x40u) /* Can start physical IO? */
+#define __GFP_FS ((__force gfp_t)0x80u) /* Can call down to low-level FS? */
+#define __GFP_COLD ((__force gfp_t)0x100u) /* Cache-cold page required */
+#define __GFP_NOWARN ((__force gfp_t)0x200u) /* Suppress page allocation failure warning */
+#define __GFP_REPEAT ((__force gfp_t)0x400u) /* Retry the allocation. Might fail */
+#define __GFP_NOFAIL ((__force gfp_t)0x800u) /* Retry for ever. Cannot fail */
+#define __GFP_NORETRY ((__force gfp_t)0x1000u)/* Do not retry. Might fail */
+#define __GFP_NO_GROW ((__force gfp_t)0x2000u)/* Slab internal usage */
+#define __GFP_COMP ((__force gfp_t)0x4000u)/* Add compound page metadata */
+#define __GFP_ZERO ((__force gfp_t)0x8000u)/* Return zeroed page on success */
+#define __GFP_NOMEMALLOC ((__force gfp_t)0x10000u) /* Don't use emergency reserves */
+#define __GFP_NORECLAIM ((__force gfp_t)0x20000u) /* No realy zone reclaim during allocation */
+#define __GFP_HARDWALL ((__force gfp_t)0x40000u) /* Enforce hardwall cpuset memory allocs */
#define __GFP_BITS_SHIFT 20 /* Room for 20 __GFP_FOO bits */
-#define __GFP_BITS_MASK ((1 << __GFP_BITS_SHIFT) - 1)
+#define __GFP_BITS_MASK ((__force gfp_t)((1 << __GFP_BITS_SHIFT) - 1))
/* if you forget to add the bitmask here kernel will crash, period */
#define GFP_LEVEL_MASK (__GFP_WAIT|__GFP_HIGH|__GFP_IO|__GFP_FS| \
@@ -64,6 +64,7 @@ struct vm_area_struct;
#define GFP_DMA __GFP_DMA
+#define gfp_zone(mask) ((__force int)((mask) & (__force gfp_t)GFP_ZONEMASK))
/*
* There is only one page-allocator function, and two main namespaces to
@@ -94,7 +95,7 @@ static inline struct page *alloc_pages_node(int nid, gfp_t gfp_mask,
return NULL;
return __alloc_pages(gfp_mask, order,
- NODE_DATA(nid)->node_zonelists + (gfp_mask & GFP_ZONEMASK));
+ NODE_DATA(nid)->node_zonelists + gfp_zone(gfp_mask));
}
#ifdef CONFIG_NUMA