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authorDave Airlie <airlied@redhat.com>2019-04-15 15:51:49 +1000
committerDave Airlie <airlied@redhat.com>2019-04-15 15:51:49 +1000
commitf06ddb53096b4cddad2c530125a78a3c2a1d28a4 (patch)
tree36a05922af22272dc82357ce82be21a3a9214bd0 /lib/string.c
parentecc4946f11a07884f230450a6d5a92337bc21375 (diff)
parentdc4060a5dc2557e6b5aa813bf5b73677299d62d2 (diff)
BackMerge v5.1-rc5 into drm-next
Need rc5 for udl fix to add udl cleanups on top. Signed-off-by: Dave Airlie <airlied@redhat.com>
Diffstat (limited to 'lib/string.c')
-rw-r--r--lib/string.c20
1 files changed, 20 insertions, 0 deletions
diff --git a/lib/string.c b/lib/string.c
index 38e4ca08e757..3ab861c1a857 100644
--- a/lib/string.c
+++ b/lib/string.c
@@ -866,6 +866,26 @@ __visible int memcmp(const void *cs, const void *ct, size_t count)
EXPORT_SYMBOL(memcmp);
#endif
+#ifndef __HAVE_ARCH_BCMP
+/**
+ * bcmp - returns 0 if and only if the buffers have identical contents.
+ * @a: pointer to first buffer.
+ * @b: pointer to second buffer.
+ * @len: size of buffers.
+ *
+ * The sign or magnitude of a non-zero return value has no particular
+ * meaning, and architectures may implement their own more efficient bcmp(). So
+ * while this particular implementation is a simple (tail) call to memcmp, do
+ * not rely on anything but whether the return value is zero or non-zero.
+ */
+#undef bcmp
+int bcmp(const void *a, const void *b, size_t len)
+{
+ return memcmp(a, b, len);
+}
+EXPORT_SYMBOL(bcmp);
+#endif
+
#ifndef __HAVE_ARCH_MEMSCAN
/**
* memscan - Find a character in an area of memory.