From 8e4b8e9d807aa379d2a1c3aaac2537ba7d6bf0bf Mon Sep 17 00:00:00 2001
From: "Bjoern A. Zeeb" <bz@FreeBSD.org>
Date: Mon, 13 May 2024 17:43:25 +0000
Subject: [PATCH] LinuxKPI: add kvmemdup()

Add kvmemdup() as a variant of kmemdup().  While currently it could
just call kmemdup() we duplicate the code and use kvmalloc() in case
someone will change the implementation of kvmalloc/kvfree in slab.h.
This is used by an updated wireless driver.

Sponsored by:	The FreeBSD Foundation
MFC after:	3 days
Reviewed by:	emaste
Differential Revision: https://reviews.freebsd.org/D45181
---
 sys/compat/linuxkpi/common/include/linux/string.h | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/sys/compat/linuxkpi/common/include/linux/string.h b/sys/compat/linuxkpi/common/include/linux/string.h
index 9e1818a3859..32470312b78 100644
--- a/sys/compat/linuxkpi/common/include/linux/string.h
+++ b/sys/compat/linuxkpi/common/include/linux/string.h
@@ -98,6 +98,18 @@ kmemdup(const void *src, size_t len, gfp_t gfp)
 	return (dst);
 }
 
+/* See slab.h for kvmalloc/kvfree(). */
+static inline void *
+kvmemdup(const void *src, size_t len, gfp_t gfp)
+{
+	void *dst;
+
+	dst = kvmalloc(len, gfp);
+	if (dst != NULL)
+		memcpy(dst, src, len);
+	return (dst);
+}
+
 static inline char *
 strndup_user(const char __user *ustr, long n)
 {