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sched/preempt: Tell about PREEMPT_DYNAMIC on kernel headers

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Displaying "PREEMPT" on kernel headers when CONFIG_PREEMPT_DYNAMIC=y
can be misleading for anybody involved in remote debugging because it
is then not guaranteed that there is an actual preemption behaviour. It
depends on default Kconfig or boot defined choices.

Therefore, tell about PREEMPT_DYNAMIC on static kernel headers and leave
the search for the actual preemption behaviour to browsing dmesg.

Reviewed-by: Valentin Schneider <valentin.schneider@arm.com>
Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20220217111240.GA742892@lothringen
This commit is contained in:
Frederic Weisbecker 2022-02-17 12:12:40 +01:00 committed by Peter Zijlstra
parent 7f434dff76
commit a0a7e453b5
2 changed files with 14 additions and 6 deletions
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3
init/Makefile
View file

@ -31,7 +31,8 @@ quiet_cmd_compile.h = CHK $@
cmd_compile.h = \
$(CONFIG_SHELL) $(srctree)/scripts/mkcompile_h $@ \
"$(UTS_MACHINE)" "$(CONFIG_SMP)" "$(CONFIG_PREEMPT_BUILD)" \
"$(CONFIG_PREEMPT_RT)" "$(CONFIG_CC_VERSION_TEXT)" "$(LD)"
"$(CONFIG_PREEMPT_DYNAMIC)" "$(CONFIG_PREEMPT_RT)" \
"$(CONFIG_CC_VERSION_TEXT)" "$(LD)"
include/generated/compile.h: FORCE
$(call cmd,compile.h)

17
scripts/mkcompile_h
View file

@ -5,9 +5,10 @@ TARGET=$1
ARCH=$2
SMP=$3
PREEMPT=$4
PREEMPT_RT=$5
CC_VERSION="$6"
LD=$7
PREEMPT_DYNAMIC=$5
PREEMPT_RT=$6
CC_VERSION="$7"
LD=$8
# Do not expand names
set -f
@ -41,8 +42,14 @@ fi
UTS_VERSION="#$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="$CONFIG_FLAGS PREEMPT_RT"; fi
if [ -n "$PREEMPT_RT" ] ; then
CONFIG_FLAGS="$CONFIG_FLAGS PREEMPT_RT"
elif [ -n "$PREEMPT_DYNAMIC" ] ; then
CONFIG_FLAGS="$CONFIG_FLAGS PREEMPT_DYNAMIC"
elif [ -n "$PREEMPT" ] ; then
CONFIG_FLAGS="$CONFIG_FLAGS PREEMPT"
fi
# Truncate to maximum length
UTS_LEN=64