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-rw-r--r--lib/bitmap.c29
1 files changed, 29 insertions, 0 deletions
diff --git a/lib/bitmap.c b/lib/bitmap.c
index b499ab6ada29..5bc7a1128fe8 100644
--- a/lib/bitmap.c
+++ b/lib/bitmap.c
@@ -12,6 +12,8 @@
#include <linux/bitmap.h>
#include <linux/bitops.h>
#include <linux/bug.h>
+
+#include <asm/page.h>
#include <asm/uaccess.h>
/*
@@ -584,6 +586,33 @@ int bitmap_scnlistprintf(char *buf, unsigned int buflen,
EXPORT_SYMBOL(bitmap_scnlistprintf);
/**
+ * bitmap_print_to_pagebuf - convert bitmap to list or hex format ASCII string
+ * @list: indicates whether the bitmap must be list
+ * @buf: page aligned buffer into which string is placed
+ * @maskp: pointer to bitmap to convert
+ * @nmaskbits: size of bitmap, in bits
+ *
+ * Output format is a comma-separated list of decimal numbers and
+ * ranges if list is specified or hex digits grouped into comma-separated
+ * sets of 8 digits/set. Returns the number of characters written to buf.
+ */
+int bitmap_print_to_pagebuf(bool list, char *buf, const unsigned long *maskp,
+ int nmaskbits)
+{
+ ptrdiff_t len = PTR_ALIGN(buf + PAGE_SIZE - 1, PAGE_SIZE) - buf - 2;
+ int n = 0;
+
+ if (len > 1) {
+ n = list ? bitmap_scnlistprintf(buf, len, maskp, nmaskbits) :
+ bitmap_scnprintf(buf, len, maskp, nmaskbits);
+ buf[n++] = '\n';
+ buf[n] = '\0';
+ }
+ return n;
+}
+EXPORT_SYMBOL(bitmap_print_to_pagebuf);
+
+/**
* __bitmap_parselist - convert list format ASCII string to bitmap
* @buf: read nul-terminated user string from this buffer
* @buflen: buffer size in bytes. If string is smaller than this