Commit a0a7e453 authored by Frederic Weisbecker's avatar Frederic Weisbecker Committed by Peter Zijlstra
Browse files

sched/preempt: Tell about PREEMPT_DYNAMIC on kernel headers 



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: default avatarValentin Schneider <valentin.schneider@arm.com>
Signed-off-by: default avatarFrederic Weisbecker <frederic@kernel.org>
Signed-off-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20220217111240.GA742892@lothringen
parent 7f434dff

init/Makefile

+2 −1
Original line number Diff line number Diff line
@@ -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)

scripts/mkcompile_h

+12 −5
Original line number Diff line number Diff line
@@ -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