git: cefd0ae770bf - main - linuxkpi: Add several `guid_*()` functions

The branch main has been updated by dumbbell:

URL: https://cgit.FreeBSD.org/src/commit/?id=cefd0ae770bfad534ec666099489a869387e8836

commit cefd0ae770bfad534ec666099489a869387e8836
Author:     Jean-Sébastien Pédron <dumbbell@FreeBSD.org>
AuthorDate: 2026-04-13 22:36:18 +0000
Commit:     Jean-Sébastien Pédron <dumbbell@FreeBSD.org>
CommitDate: 2026-04-21 22:18:25 +0000

    linuxkpi: Add several `guid_*()` functions
    
    The DRM generic code and the amdgpu DRM driver started to use several of
    these functions in Linux 6.12. Likewise for `UUID_SIZE`.
    
    Reviewed by:    bz
    Sponsored by:   The FreeBSD Foundation
    Differential Revision: https://reviews.freebsd.org/D56448
---
 sys/compat/linuxkpi/common/include/linux/uuid.h | 27 +++++++++++++++++++++++++
 sys/compat/linuxkpi/common/src/linux_compat.c   |  3 +++
 2 files changed, 30 insertions(+)

diff --git a/sys/compat/linuxkpi/common/include/linux/uuid.h b/sys/compat/linuxkpi/common/include/linux/uuid.h
index 4f6f4a8b34f0..0765ef4dcc1e 100644
--- a/sys/compat/linuxkpi/common/include/linux/uuid.h
+++ b/sys/compat/linuxkpi/common/include/linux/uuid.h
@@ -33,6 +33,7 @@
 
 #include <linux/random.h>
 
+#define	UUID_SIZE	16
 #define	UUID_STRING_LEN	36
 
 #define	GUID_INIT(x0_3, x4_5, x6_7, x8, x9, x10, x11, x12, x13, x14, x15) \
@@ -59,6 +60,8 @@ typedef struct {
 	char	x[16];
 } guid_t;
 
+extern const guid_t guid_null;
+
 static inline void
 guid_gen(guid_t *g)
 {
@@ -68,10 +71,34 @@ guid_gen(guid_t *g)
 	g->x[8] = (g->x[8] & 0x3f) | 0x80;
 }
 
+static inline bool
+guid_equal(const guid_t *u1, const guid_t *u2)
+{
+	return (memcmp(u1, u2, sizeof(guid_t)) == 0);
+}
+
 static inline void
 guid_copy(guid_t *dst, const guid_t *src)
 {
 	memcpy(dst, src, sizeof(*dst));
 }
 
+static inline void
+import_guid(guid_t *dst, const uint8_t *src)
+{
+	memcpy(dst, src, sizeof(guid_t));
+}
+
+static inline void
+export_guid(uint8_t *dst, const guid_t *src)
+{
+	memcpy(dst, src, sizeof(guid_t));
+}
+
+static inline bool
+guid_is_null(const guid_t *guid)
+{
+	return (guid_equal(guid, &guid_null));
+}
+
 #endif	/* _LINUXKPI_LINUX_UUID_H */
diff --git a/sys/compat/linuxkpi/common/src/linux_compat.c b/sys/compat/linuxkpi/common/src/linux_compat.c
index 8fc644241d79..0c7032fa6e23 100644
--- a/sys/compat/linuxkpi/common/src/linux_compat.c
+++ b/sys/compat/linuxkpi/common/src/linux_compat.c
@@ -98,6 +98,7 @@
 #include <linux/interval_tree_generic.h>
 #include <linux/printk.h>
 #include <linux/seq_file.h>
+#include <linux/uuid.h>
 
 #if defined(__i386__) || defined(__amd64__)
 #include <asm/smp.h>
@@ -164,6 +165,8 @@ unsigned long linux_timer_hz_mask;
 wait_queue_head_t linux_bit_waitq;
 wait_queue_head_t linux_var_waitq;
 
+const guid_t guid_null;
+
 int
 panic_cmp(struct rb_node *one, struct rb_node *two)
 {