From: Felix Fietkau <nbd@openwrt.org>
To: backports@vger.kernel.org
Cc: hauke@hauke-m.de
Subject: [PATCH v2 1/3] backports: add GENMASK and GENMASK_ULL
Date: Sun, 16 Nov 2014 14:39:57 +0100 [thread overview]
Message-ID: <1416145199-44209-1-git-send-email-nbd@openwrt.org> (raw)
I intend to use this for a new driver
Signed-off-by: Felix Fietkau <nbd@openwrt.org>
---
backport/backport-include/linux/bitops.h | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)
create mode 100644 backport/backport-include/linux/bitops.h
diff --git a/backport/backport-include/linux/bitops.h b/backport/backport-include/linux/bitops.h
new file mode 100644
index 0000000..b0e9283
--- /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 */
--
2.1.2
next reply other threads:[~2014-11-16 13:40 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-11-16 13:39 Felix Fietkau [this message]
2014-11-16 13:39 ` [PATCH v2 2/3] backports: add include/uapi/linux/pci_regs.h to copy-list Felix Fietkau
2014-11-16 13:39 ` [PATCH v2 3/3] backports: backport devm_kmemdup Felix Fietkau
2014-11-16 16:46 ` Hauke Mehrtens
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