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authorRoland McGrath <roland@gnu.org>1995-02-21 20:27:45 +0000
committerRoland McGrath <roland@gnu.org>1995-02-21 20:27:45 +0000
commitcaa8cd20fd1ef25a3989bb68ee2f4ffee78d8456 (patch)
tree1c5aaef96d08ea34b5e07a2ce3efdcb06f890cb8 /sysdeps/generic
parent6e583a6e115276860826c45e53cd038723ef0956 (diff)
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Diffstat (limited to 'sysdeps/generic')
-rw-r--r--sysdeps/generic/pagecopy.h11
1 files changed, 6 insertions, 5 deletions
diff --git a/sysdeps/generic/pagecopy.h b/sysdeps/generic/pagecopy.h
index 07202a3..66e1ac3 100644
--- a/sysdeps/generic/pagecopy.h
+++ b/sysdeps/generic/pagecopy.h
@@ -42,25 +42,26 @@ Cambridge, MA 02139, USA. */
#if PAGE_COPY_THRESHOLD
+#include <assert.h>
+
#define PAGE_COPY_FWD_MAYBE(dstp, srcp, nbytes_left, nbytes) \
do \
{ \
if ((nbytes) >= PAGE_COPY_THRESHOLD && \
- PAGE_OFFSET (dstp) == PAGE_OFFSET (srcp)) \
+ PAGE_OFFSET ((dstp) - (srcp)) == 0) \
{ \
/* The amount to copy is past the threshold for copying \
pages virtually with kernel VM operations, and the \
source and destination addresses have the same alignment. */ \
- size_t nbytes_before = PAGE_OFFSET (PAGE_SIZE - PAGE_OFFSET (dstp));\
+ size_t nbytes_before = PAGE_OFFSET (-(dstp)); \
if (nbytes_before != 0) \
{ \
/* First copy the words before the first page boundary. */ \
WORD_COPY_FWD (dstp, srcp, nbytes_left, nbytes_before); \
- nbytes_before -= nbytes_left; \
+ assert (nbytes_left == 0); \
nbytes -= nbytes_before; \
} \
- if (nbytes_before == 0) \
- PAGE_COPY_FWD (dstp, srcp, nbytes_left, nbytes); \
+ PAGE_COPY_FWD (dstp, srcp, nbytes_left, nbytes); \
} \
} while (0)