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Frederic Weisbecker a0a7e453b5 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: 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

2022-03-11 15:36:35 +01:00

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SPDX-License-Identifier: GPL-2.0

Makefile for the linux kernel.

ccflags-y := -fno-function-sections -fno-data-sections

obj-y := main.o version.o mounts.o ifneq ($(CONFIG_BLK_DEV_INITRD),y) obj-y += noinitramfs.o else obj-$(CONFIG_BLK_DEV_INITRD) += initramfs.o endif obj-$(CONFIG_GENERIC_CALIBRATE_DELAY) += calibrate.o

obj-y += init_task.o

mounts-y := do_mounts.o mounts-$(CONFIG_BLK_DEV_RAM) += do_mounts_rd.o mounts-$(CONFIG_BLK_DEV_INITRD) += do_mounts_initrd.o

dependencies on generated files need to be listed explicitly

$(obj)/version.o: include/generated/compile.h

compile.h changes depending on hostname, generation number, etc,

so we regenerate it always.

mkcompile_h will make sure to only update the

actual file if its content has changed.

quiet_cmd_compile.h = CHK $@ cmd_compile.h =
$(CONFIG_SHELL) $(srctree)/scripts/mkcompile_h $@
"$(UTS_MACHINE)" "$(CONFIG_SMP)" "$(CONFIG_PREEMPT_BUILD)"
"$(CONFIG_PREEMPT_DYNAMIC)" "$(CONFIG_PREEMPT_RT)"
"$(CONFIG_CC_VERSION_TEXT)" "$(LD)"

include/generated/compile.h: FORCE $(call cmd,compile.h)

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