kernel.bbclass: introduce KERNEL_LOCALVERSION

Just like UBOOT_LOCALVERSION, an end user can set KERNEL_LOCALVERSION
to append a string to the name of the local version of the kernel
image.

(From OE-Core rev: 29a0d2a49df8e24f3948a2ddf03743f0cb5d09dd)

Signed-off-by: Ming Liu <liu.ming50@gmail.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

cherry-picked from master 229435a52f36ddec5f85fb6d5ccd42044b688397

Signed-off-by: Andreas Helbech Kleist <andreaskleist@gmail.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>

2 files changed, 6 insertions, 1 deletions

diff --git a/meta/classes/kernel.bbclass b/meta/classes/kernel.bbclass
index 5951347361..80fb1879b0 100644
--- a/meta/classes/kernel.bbclass
+++ b/meta/classes/kernel.bbclass
@@ -614,6 +614,7 @@ do_shared_workdir () {
 # We don't need to stage anything, not the modules/firmware since those would clash with linux-firmware
 SYSROOT_DIRS = ""
 
+KERNEL_LOCALVERSION ??= ""
 KERNEL_CONFIG_COMMAND ?= "oe_runmake_call -C ${S} O=${B} olddefconfig || oe_runmake -C ${S} O=${B} oldnoconfig"
 
 python check_oldest_kernel() {
@@ -635,7 +636,10 @@ kernel_do_configure() {
         # $ scripts/setlocalversion . => +
         # $ make kernelversion => 2.6.37
         # $ make kernelrelease => 2.6.37+
-        touch ${B}/.scmversion ${S}/.scmversion
+        if [ ! -e ${B}/.scmversion -a ! -e ${S}/.scmversion ]; then
+                echo ${KERNEL_LOCALVERSION} > ${B}/.scmversion
+                echo ${KERNEL_LOCALVERSION} > ${S}/.scmversion
+        fi
 
         if [ "${S}" != "${B}" ] && [ -f "${S}/.config" ] && [ ! -f "${B}/.config" ]; then
                 mv "${S}/.config" "${B}/.config"
diff --git a/meta/conf/documentation.conf b/meta/conf/documentation.conf
index ab2addb321..e55bfa288d 100644
--- a/meta/conf/documentation.conf
+++ b/meta/conf/documentation.conf
@@ -253,6 +253,7 @@ KERNEL_MODULE_PROBECONF[doc] = "Lists kernel modules for which the build system
 KERNEL_PACKAGE_NAME[doc] = "Name prefix for kernel packages. Defaults to 'kernel'."
 KERNEL_PATH[doc] = "The location of the kernel sources. This variable is set to the value of the STAGING_KERNEL_DIR within the module class (module.bbclass)."
 KERNEL_SRC[doc] = "The location of the kernel sources. This variable is set to the value of the STAGING_KERNEL_DIR within the module class (module.bbclass)."
+KERNEL_LOCALVERSION[doc] = "Appends a string to the name of the local version of the kernel image."
 KFEATURE_DESCRIPTION[doc] = "Provides a short description of a configuration fragment. You use this variable in the .scc file that describes a configuration fragment file."
 KMACHINE[doc] = "The machine as known by the kernel."
 KTYPE[doc] = "Defines the kernel type to be used in assembling the configuration."