git: 5d1539f8401e - stable/15 - linuxkpi: Add `rol64()`

The branch stable/15 has been updated by bz:

URL: https://cgit.FreeBSD.org/src/commit/?id=5d1539f8401eff8fc2c1e424ff4782ee15882234

commit 5d1539f8401eff8fc2c1e424ff4782ee15882234
Author:     Jean-Sébastien Pédron <dumbbell@FreeBSD.org>
AuthorDate: 2025-09-07 23:22:22 +0000
Commit:     Bjoern A. Zeeb <bz@FreeBSD.org>
CommitDate: 2026-04-22 20:56:55 +0000

    linuxkpi: Add `rol64()`
    
    This is used by <linux/siphash.h> added in a separate future commit.
    
    Reviewed by:    bz
    Sponsored by:   The FreeBSD Foundation
    Differential Revision: https://reviews.freebsd.org/D54499
    
    (cherry picked from commit a9462e32fa75a9a1e3f49964bc42b5303e0dd092)
---
 sys/compat/linuxkpi/common/include/linux/bitops.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/sys/compat/linuxkpi/common/include/linux/bitops.h b/sys/compat/linuxkpi/common/include/linux/bitops.h
index e34ba391421a..427d52b0dc81 100644
--- a/sys/compat/linuxkpi/common/include/linux/bitops.h
+++ b/sys/compat/linuxkpi/common/include/linux/bitops.h
@@ -437,4 +437,10 @@ sign_extend32(uint32_t value, int index)
 	return ((int32_t)(value << shift) >> shift);
 }
 
+static inline uint64_t
+rol64(uint64_t word, unsigned int shift)
+{
+	return ((word << (shift & 63)) | (word >> ((-shift) & 63)));
+}
+
 #endif	/* _LINUXKPI_LINUX_BITOPS_H_ */