diff mbox series

[master,kirkstone] kernel.bbclass: make KERNEL_DEBUG_TIMESTAMPS work at rebuild

Message ID 20221117040048.14781-1-Qi.Chen@windriver.com
State Accepted, archived
Commit 1b68c2d2d385013a1c535ef81172494302a36d74
Headers show
Series [master,kirkstone] kernel.bbclass: make KERNEL_DEBUG_TIMESTAMPS work at rebuild | expand

Commit Message

ChenQi Nov. 17, 2022, 4 a.m. UTC 
Currently, the KERNEL_DEBUG_TIMESTAMPS is not working as expected
at rebuild. That is, even if we set it to "1", the kernel build time
is not changed. The problem could be reproduced by the following steps.
  1. bitbake core-image-minimal; start image and check `uname -a` output.
  2. set in local.conf: KERNEL_DEBUG_TIMESTAMPS = "1"
  3. bitbake core-image-minimal; start image and check `uname -a` output.

It's expected that after enabling KERNEL_DEBUG_TIMESTAMPS, the kernel
build time will be set to current date. But it's not. This is because
the compile.h was not re-generated when do_compile task was re-executed.

In mkcompile_h, we have:
"""
"""
It has made it very clear that it will not be re-generated unless
we have KBUILD_BUILD_TIMESTAMP set explicitly. So we set this variable
explicitly in do_compile to fix this issue.

Signed-off-by: Chen Qi <Qi.Chen@windriver.com>
---
 meta/classes-recipe/kernel.bbclass | 8 ++++++++
 1 file changed, 8 insertions(+)
diff mbox series

Patch

diff --git a/meta/classes-recipe/kernel.bbclass b/meta/classes-recipe/kernel.bbclass
index 3834a42fb9..3f6b40907f 100644
--- a/meta/classes-recipe/kernel.bbclass
+++ b/meta/classes-recipe/kernel.bbclass
@@ -367,6 +367,10 @@  kernel_do_compile() {
 		export KBUILD_BUILD_TIMESTAMP="$ts"
 		export KCONFIG_NOTIMESTAMP=1
 		bbnote "KBUILD_BUILD_TIMESTAMP: $ts"
+	else
+		ts=`LC_ALL=C date`
+		export KBUILD_BUILD_TIMESTAMP="$ts"
+		bbnote "KBUILD_BUILD_TIMESTAMP: $ts"
 	fi
 	# The $use_alternate_initrd is only set from
 	# do_bundle_initramfs() This variable is specifically for the
@@ -412,6 +416,10 @@  do_compile_kernelmodules() {
 		export KBUILD_BUILD_TIMESTAMP="$ts"
 		export KCONFIG_NOTIMESTAMP=1
 		bbnote "KBUILD_BUILD_TIMESTAMP: $ts"
+	else
+		ts=`LC_ALL=C date`
+		export KBUILD_BUILD_TIMESTAMP="$ts"
+		bbnote "KBUILD_BUILD_TIMESTAMP: $ts"
 	fi
 	if (grep -q -i -e '^CONFIG_MODULES=y$' ${B}/.config); then
 		oe_runmake -C ${B} ${PARALLEL_MAKE} modules ${KERNEL_EXTRA_ARGS}