From: Heiko Schocher <hs@nabladev.com>
Date: Tue, 18 Nov 2025 04:30:37 +0000 (+0100)
Subject: lib: Import rol32 function from Linux
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6a0c939b88fd42c6b0a374f7c87317f292df46a1;p=thirdparty%2Fu-boot.git

lib: Import rol32 function from Linux

sm3 crypto algorithm uses rol32 function from linux, so
import it. Linux base was:

commit ca91b9500108:("Merge tag 'v6.15-rc4-ksmbd-server-fixes' of git://git.samba.org/ksmbd")

Signed-off-by: Heiko Schocher <hs@nabladev.com>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
---

diff --git a/include/linux/bitops.h b/include/linux/bitops.h
index f826d7f3b34..29e0da48de8 100644
--- a/include/linux/bitops.h
+++ b/include/linux/bitops.h
@@ -148,6 +148,17 @@ static inline unsigned long hweight_long(unsigned long w)
 	return sizeof(w) == 4 ? generic_hweight32(w) : generic_hweight64(w);
 }
 
+/**
+ * rol32 - rotate a 32-bit value left
+ * @word: value to rotate
+ * @shift: bits to roll
+ */
+
+static inline __u32 rol32(__u32 word, unsigned int shift)
+{
+	return (word << (shift & 31)) | (word >> ((-shift) & 31));
+}
+
 #include <asm/bitops.h>
 
 /* linux/include/asm-generic/bitops/non-atomic.h */