git: 5a0c302cc990 - stable/15 - mbuf: simplify m_free

The branch stable/15 has been updated by kbowling:

URL: https://cgit.FreeBSD.org/src/commit/?id=5a0c302cc990e665744586206d326d4bd538c83a

commit 5a0c302cc990e665744586206d326d4bd538c83a
Author:     Andrew Gallatin <gallatin@FreeBSD.org>
AuthorDate: 2026-10-12 21:32:52 +0000
Commit:     Kevin Bowling <kbowling@FreeBSD.org>
CommitDate: 2026-10-30 17:47:12 +0000

    mbuf: simplify m_free
    
    The check for  (M_PKTHDR|M_NOFREE) was added by np@ in
    "91d1b03d3617 Merge r254736 from user/np/cxl_tuning."
    in order to support a clever rx mode optimization used
    by cxgbe at the time.  That optimization was removed in
    46e1e307edb6 several years ago.  This check is otherwise
    unneeded and adds an extraneous test to every mbuf free,
    so let's remove it.
    
    Reviewed by: glebius, np
    Differential Revision: https://reviews.freebsd.org/D60686
    Sponsored by: Netflix
    
    (cherry picked from commit 398254f9999eb1af5f0842570111d584aaf8d01a)
---
 sys/sys/mbuf.h | 2 --
 1 file changed, 2 deletions(-)

diff --git a/sys/sys/mbuf.h b/sys/sys/mbuf.h
index 3f1c48b41b2a..6a27a917e46b 100644
--- a/sys/sys/mbuf.h
+++ b/sys/sys/mbuf.h
@@ -1536,8 +1536,6 @@ m_free(struct mbuf *m)
 	struct mbuf *n = m->m_next;
 
 	MBUF_PROBE1(m__free, m);
-	if ((m->m_flags & (M_PKTHDR|M_NOFREE)) == (M_PKTHDR|M_NOFREE))
-		m_tag_delete_chain(m, NULL);
 	if (m->m_flags & M_PKTHDR && m->m_pkthdr.csum_flags & CSUM_SND_TAG)
 		m_snd_tag_rele(m->m_pkthdr.snd_tag);
 	if (m->m_flags & M_EXTPG)