aboutsummaryrefslogtreecommitdiffstats
path: root/lib/bitmap.c
diff options
context:
space:
mode:
authorMike Travis <travis@sgi.com>2008-03-25 15:06:55 -0700
committerIngo Molnar <mingo@elte.hu>2008-04-19 19:44:58 +0200
commit30ca60c15a725f655e5d3f14e0238a066bc5aeb7 (patch)
tree96d36a2cf12e7a964ce4cd0c49d30b2d40f94b52 /lib/bitmap.c
parent9f0e738f492522a2f70ad9a2a0287e4e966c633a (diff)
cpumask: add cpumask_scnprintf_len function
Add a new function cpumask_scnprintf_len() to return the number of characters needed to display "len" cpumask bits. The current method of allocating NR_CPUS bytes is incorrect as what's really needed is 9 characters per 32-bit word of cpumask bits (8 hex digits plus the seperator [','] or the terminating NULL.) This function provides the caller the means to allocate the correct string length. Cc: Paul Jackson <pj@sgi.com> Signed-off-by: Mike Travis <travis@sgi.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'lib/bitmap.c')
-rw-r--r--lib/bitmap.c16
1 files changed, 16 insertions, 0 deletions
diff --git a/lib/bitmap.c b/lib/bitmap.c
index 2c9242e3fed0..a6939e18d7bb 100644
--- a/lib/bitmap.c
+++ b/lib/bitmap.c
@@ -316,6 +316,22 @@ int bitmap_scnprintf(char *buf, unsigned int buflen,
EXPORT_SYMBOL(bitmap_scnprintf);
/**
+ * bitmap_scnprintf_len - return buffer length needed to convert
+ * bitmap to an ASCII hex string.
+ * @len: number of bits to be converted
+ */
+int bitmap_scnprintf_len(unsigned int len)
+{
+ /* we need 9 chars per word for 32 bit words (8 hexdigits + sep/null) */
+ int bitslen = ALIGN(len, CHUNKSZ);
+ int wordlen = CHUNKSZ / 4;
+ int buflen = (bitslen / wordlen) * (wordlen + 1) * sizeof(char);
+
+ return buflen;
+}
+EXPORT_SYMBOL(bitmap_scnprintf_len);
+
+/**
* __bitmap_parse - convert an ASCII hex string into a bitmap.
* @buf: pointer to buffer containing string.
* @buflen: buffer size in bytes. If string is smaller than this

Privacy Policy