D6654.id17168.diff
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	Index: head/usr.bin/mkimg/image.c
	===================================================================
	--- head/usr.bin/mkimg/image.c
	+++ head/usr.bin/mkimg/image.c
	@@ -32,6 +32,7 @@
	#include <sys/stat.h>
	#include <sys/types.h>
	#include <assert.h>
	+#include <err.h>
	#include <errno.h>
	#include <limits.h>
	#include <paths.h>
	@@ -315,6 +316,8 @@

	unit = (secsz > image_swap_pgsz) ? secsz : image_swap_pgsz;
	sz = (sz + unit - 1) & ~(unit - 1);
	+ if (madvise(buffer, sz, MADV_DONTNEED) != 0)
	+ warn("madvise");
	munmap(buffer, sz);
	return (0);
	}