git: 6bffebee7e57 - stable/13 - bitset: Fix __BIT_FFS_AT()'s herald comment

The branch stable/13 has been updated by olce:

URL: https://cgit.FreeBSD.org/src/commit/?id=6bffebee7e576553006b108ed7e8518164101502

commit 6bffebee7e576553006b108ed7e8518164101502
Author:     Olivier Certner <olce@FreeBSD.org>
AuthorDate: 2024-06-03 19:22:12 +0000
Commit:     Olivier Certner <olce@FreeBSD.org>
CommitDate: 2024-10-04 08:44:18 +0000

    bitset: Fix __BIT_FFS_AT()'s herald comment
    
    The manual page is correct though.
    
    No functional change.
    
    Reviewed by:    emaste
    Approved by:    emaste (mentor)
    MFC after:      3 days
    Event:          Kitchener-Waterloo Hackathon 202406
    Sponsored by:   The FreeBSD Foundation
    
    (cherry picked from commit f3ab0d86e8070c73bf2e2852341f8e5c709f5682)
    
    Approved by:    emaste (mentor)
---
 sys/sys/bitset.h | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/sys/sys/bitset.h b/sys/sys/bitset.h
index 5ff2bb76a4ab..2e15df7de4dd 100644
--- a/sys/sys/bitset.h
+++ b/sys/sys/bitset.h
@@ -220,8 +220,9 @@
 } while (0)
 
 /*
- * Note that `start` and the returned value from __BIT_FFS_AT are
- * 1-based bit indices.
+ * 'start' and 'end' are 0-based bit (runtime) indices. Note that, as for ffs(),
+ * the returned index is 1-based, 0 being reserved to indicate that no bits are
+ * set.
  */
 #define	__BIT_FFS_AT(_s, p, start) __extension__ ({			\
 	__size_t __i;							\