git: 78f3e0f6b3ad - main - malloc(9): Introduce M_NEVERFREED

The branch main has been updated by bnovkov:

URL: https://cgit.FreeBSD.org/src/commit/?id=78f3e0f6b3ad70d9574730fc3338474376ef8ebd

commit 78f3e0f6b3ad70d9574730fc3338474376ef8ebd
Author:     Bojan Novković <bnovkov@FreeBSD.org>
AuthorDate: 2024-05-03 18:18:56 +0000
Commit:     Bojan Novković <bnovkov@FreeBSD.org>
CommitDate: 2024-07-30 15:38:18 +0000

    malloc(9): Introduce M_NEVERFREED
    
    This patch adds an additional malloc(9) flag to distinguish allocations
    that are never freed during runtime.
    
    Differential Revision:  https://reviews.freebsd.org/D45045
    Reviewed by:    alc, kib, markj
    Tested by:      alc
---
 sys/sys/malloc.h  | 3 ++-
 sys/vm/uma_core.c | 3 +++
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/sys/sys/malloc.h b/sys/sys/malloc.h
index dfd7928fc258..9b281da4b4d4 100644
--- a/sys/sys/malloc.h
+++ b/sys/sys/malloc.h
@@ -60,8 +60,9 @@
 #define	M_BESTFIT	0x2000		/* only for vmem, low fragmentation */
 #define	M_EXEC		0x4000		/* allocate executable space */
 #define	M_NEXTFIT	0x8000		/* only for vmem, follow cursor */
+#define	M_NEVERFREED 	0x10000		/* chunk will never get freed */
 
-#define	M_VERSION	2020110501
+#define	M_VERSION	2024073001
 
 /*
  * Two malloc type structures are present: malloc_type, which is used by a
diff --git a/sys/vm/uma_core.c b/sys/vm/uma_core.c
index 516ac2c2965a..e93c561d759a 100644
--- a/sys/vm/uma_core.c
+++ b/sys/vm/uma_core.c
@@ -1791,6 +1791,9 @@ keg_alloc_slab(uma_keg_t keg, uma_zone_t zone, int domain, int flags,
 	if (keg->uk_flags & UMA_ZONE_NODUMP)
 		aflags |= M_NODUMP;
 
+	if (keg->uk_flags & UMA_ZONE_NOFREE)
+		aflags |= M_NEVERFREED;
+
 	/* zone is passed for legacy reasons. */
 	size = keg->uk_ppera * PAGE_SIZE;
 	mem = keg->uk_allocf(zone, size, domain, &sflags, aflags);