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Subject[PATCH V2] Kbuild: Handle PREEMPT_RT for version string and magic
Update the build scripts and the version magic to reflect when
CONFIG_PREEMPT_RT is enabled in the same way as CONFIG_PREEMPT is treated.

The resulting version strings:

Linux m 5.3.0-rc1+ #100 SMP Fri Jul 26 ...
Linux m 5.3.0-rc1+ #101 SMP PREEMPT Fri Jul 26 ...
Linux m 5.3.0-rc1+ #102 SMP PREEMPT_RT Fri Jul 26 ...

The module vermagic:

5.3.0-rc1+ SMP mod_unload modversions
5.3.0-rc1+ SMP preempt mod_unload modversions
5.3.0-rc1+ SMP preempt_rt mod_unload modversions

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
Cc: Michal Marek <michal.lkml@markovi.net>
Cc: linux-kbuild@vger.kernel.org
---
V2: Simplify the ifdeffery as pointed out by Masahiro
---
include/linux/vermagic.h | 2 ++
init/Makefile | 5 +++--
scripts/Makefile.modpost | 2 +-
scripts/mkcompile_h | 4 +++-
4 files changed, 9 insertions(+), 4 deletions(-)

--- a/include/linux/vermagic.h
+++ b/include/linux/vermagic.h
@@ -9,6 +9,8 @@
#endif
#ifdef CONFIG_PREEMPT
#define MODULE_VERMAGIC_PREEMPT "preempt "
+#elif defined(CONFIG_PREEMPT_RT)
+#define MODULE_VERMAGIC_PREEMPT "preempt_rt "
#else
#define MODULE_VERMAGIC_PREEMPT ""
#endif
--- a/init/Makefile
+++ b/init/Makefile
@@ -33,5 +33,6 @@ mounts-$(CONFIG_BLK_DEV_MD) += do_mounts
silent_chk_compile.h = :
include/generated/compile.h: FORCE
@$($(quiet)chk_compile.h)
- $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkcompile_h $@ \
- "$(UTS_MACHINE)" "$(CONFIG_SMP)" "$(CONFIG_PREEMPT)" "$(CC) $(KBUILD_CFLAGS)"
+ $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkcompile_h $@ \
+ "$(UTS_MACHINE)" "$(CONFIG_SMP)" "$(CONFIG_PREEMPT)" \
+ "$(CONFIG_PREEMPT_RT)" "$(CC) $(KBUILD_CFLAGS)"
--- a/scripts/Makefile.modpost
+++ b/scripts/Makefile.modpost
@@ -23,7 +23,7 @@
# Version magic (see include/linux/vermagic.h for full details)
# - Kernel release
# - SMP is CONFIG_SMP
-# - PREEMPT is CONFIG_PREEMPT
+# - PREEMPT is CONFIG_PREEMPT[_RT]
# - GCC Version
# Module info
# - Module version (MODULE_VERSION)
--- a/scripts/mkcompile_h
+++ b/scripts/mkcompile_h
@@ -5,7 +5,8 @@ TARGET=$1
ARCH=$2
SMP=$3
PREEMPT=$4
-CC=$5
+PREEMPT_RT=$5
+CC=$6

vecho() { [ "${quiet}" = "silent_" ] || echo "$@" ; }

@@ -53,6 +54,7 @@ UTS_VERSION="#$VERSION"
CONFIG_FLAGS=""
if [ -n "$SMP" ] ; then CONFIG_FLAGS="SMP"; fi
if [ -n "$PREEMPT" ] ; then CONFIG_FLAGS="$CONFIG_FLAGS PREEMPT"; fi
+if [ -n "$PREEMPT_RT" ] ; then CONFIG_FLAGS="$CONFIG_FLAGS PREEMPT_RT"; fi
UTS_VERSION="$UTS_VERSION $CONFIG_FLAGS $TIMESTAMP"

# Truncate to maximum length
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