linux-kernel - [GIT pull] sched/urgent for 5.3-rc2

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Date:   Mon, 22 Jul 2019 18:23:38 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
cc:     LKML <linux-kernel@...r.kernel.org>
Subject: [GIT pull] sched/urgent for 5.3-rc2

Linus,

please pull the latest sched-urgent-for-linus git tree from:

   git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git sched-urgent-for-linus

up to:  b8d3349803ba: sched/rt, Kconfig: Unbreak def/oldconfig with CONFIG_PREEMPT=y

The PREEMPT_RT stub config renamed PREEMPT to PREEMPT_LL and defined
PREEMPT outside of the menu and made it selectable by both PREEMPT_LL and
PREEMPT_RT.

Stupid me missed that 114 defconfigs select CONFIG_PREEMPT which obviously
can't work anymore. oldconfig builds are affected as well, but it's more
obvious as the user gets asked. [old]defconfig silently fixes it up and
selects PREEMPT_NONE. Unbreak it by undoing the rename and adding a
intermediate config symbol which is selected by both PREEMPT and
PREEMPT_RT. That requires to chase down a few #ifdefs, but it's better than
tweaking 114 defconfigs and annoying users.

Sorry for the inconveniance.

Thanks,

	tglx

------------------>
Thomas Gleixner (1):
      sched/rt, Kconfig: Unbreak def/oldconfig with CONFIG_PREEMPT=y

 kernel/Kconfig.preempt | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/kernel/Kconfig.preempt b/kernel/Kconfig.preempt
index fc020c09b7e8..deff97217496 100644
--- a/kernel/Kconfig.preempt
+++ b/kernel/Kconfig.preempt
@@ -35,10 +35,10 @@ config PREEMPT_VOLUNTARY

 	  Select this if you are building a kernel for a desktop system.

-config PREEMPT_LL
+config PREEMPT
 	bool "Preemptible Kernel (Low-Latency Desktop)"
 	depends on !ARCH_NO_PREEMPT
-	select PREEMPT
+	select PREEMPTION
 	select UNINLINE_SPIN_UNLOCK if !ARCH_INLINE_SPIN_UNLOCK
 	help
 	  This option reduces the latency of the kernel by making
@@ -58,7 +58,7 @@ config PREEMPT_LL
 config PREEMPT_RT
 	bool "Fully Preemptible Kernel (Real-Time)"
 	depends on EXPERT && ARCH_SUPPORTS_RT
-	select PREEMPT
+	select PREEMPTION
 	help
 	  This option turns the kernel into a real-time kernel by replacing
 	  various locking primitives (spinlocks, rwlocks, etc.) with
@@ -77,6 +77,6 @@ endchoice
 config PREEMPT_COUNT
        bool

-config PREEMPT
+config PREEMPTION
        bool
        select PREEMPT_COUNT