From: Felix Fietkau <nbd@openwrt.org>
Date: Sun, 16 Nov 2014 13:39:57 +0000 (+0100)
Subject: backports: add GENMASK and GENMASK_ULL
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=8c742cc8e6cdbe2c9d39a036ece86c098db18684;p=openwrt%2Fstaging%2Fblogic.git

backports: add GENMASK and GENMASK_ULL

I intend to use this for a new driver

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
---

diff --git a/backport/backport-include/linux/bitops.h b/backport/backport-include/linux/bitops.h
new file mode 100644
index 000000000000..b0e9283e93c7
--- /dev/null
+++ b/backport/backport-include/linux/bitops.h
@@ -0,0 +1,19 @@
+#ifndef __BACKPORT_BITOPS_H
+#define __BACKPORT_BITOPS_H
+#include_next <linux/bitops.h>
+#include <linux/version.h>
+#include <generated/utsrelease.h>
+
+#ifndef GENMASK
+
+/*
+ * Create a contiguous bitmask starting at bit position @l and ending at
+ * position @h. For example
+ * GENMASK_ULL(39, 21) gives us the 64bit vector 0x000000ffffe00000.
+ */
+#define GENMASK(h, l)		(((U32_C(1) << ((h) - (l) + 1)) - 1) << (l))
+#define GENMASK_ULL(h, l)	(((U64_C(1) << ((h) - (l) + 1)) - 1) << (l))
+
+#endif
+
+#endif /* __BACKPORT_BITOPS_H */