dlm: Define __always_inline for musl

dlm_controld's rbtree headers were copied from the kernel and use
__always_inline. glibc defines it in <sys/cdefs.h>, but musl does not,
so the build fails on musl:

  ./rbtree.h:153:8: error: unknown type name '__always_inline'

Add a patch that provides a fallback definition in linux_helpers.h.

AI-Generated: Uses Claude Code
Signed-off-by: Khem Raj <khem.raj@oss.qualcomm.com>

meta-networking/recipes-extended/dlm/dlm/0002-dlm_controld-Define-__always_inline-when-libc-does-n.patch

@@ -0,0 +1,34 @@
+From: Khem Raj <khem.raj@oss.qualcomm.com>
+Date: Sun, 18 Oct 2026 18:30:00 -0700
+Subject: [PATCH] dlm_controld: Define __always_inline when libc does not
+
+rbtree.h and rbtree_augmented.h were copied from the kernel and use
+__always_inline. glibc defines it in <sys/cdefs.h>, but musl does not,
+so the build fails on musl:
+
+  ./rbtree.h:153:8: error: unknown type name '__always_inline'
+
+Add a fallback definition to linux_helpers.h, which rbtree.h already
+includes.
+
+Upstream-Status: Pending
+Signed-off-by: Khem Raj <khem.raj@oss.qualcomm.com>
+---
+ dlm_controld/linux_helpers.h | 5 +++++
+ 1 file changed, 5 insertions(+)
+
+diff --git a/dlm_controld/linux_helpers.h b/dlm_controld/linux_helpers.h
+--- a/dlm_controld/linux_helpers.h
++++ b/dlm_controld/linux_helpers.h
+@@ -3,6 +3,11 @@
+ #ifndef __DLM_LINUX_HELPERS__
+ #define __DLM_LINUX_HELPERS__
+ 
++/* glibc provides this in <sys/cdefs.h>, but musl does not */
++#ifndef __always_inline
++#define __always_inline inline __attribute__((__always_inline__))
++#endif
++
+ /*
+  * static_assert - check integer constant expression at build time
+  *

meta-networking/recipes-extended/dlm/dlm_4.3.0.bb

@@ -8,6 +8,7 @@ REQUIRED_DISTRO_FEATURES = "systemd"
 SRC_URI = "https://pagure.io/dlm/archive/dlm-${PV}/dlm-dlm-${PV}.tar.gz \
            file://0001-Include-sys-sysmacros.h-for-major-minor-macros-in-gl.patch \
            file://0001-make-Replace-cp-a-with-mode-preserving-options.patch \
+           file://0002-dlm_controld-Define-__always_inline-when-libc-does-n.patch \
            "
 
 SRC_URI[sha256sum] = "8dc23b97390236032a2fe19068c7dad23f82fb624732c9bff6898b6996c9b700"