HK_TYPE_DOMAIN will soon integrate not only boot defined isolcpus= CPUs
but also cpuset isolated partitions.

Housekeeping still needs a way to record what was initially passed
to isolcpus= in order to keep these CPUs isolated after a cpuset
isolated partition is modified or destroyed while containing some of
them.

Create a new HK_TYPE_DOMAIN_BOOT to keep track of those.

Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
Reviewed-by: Phil Auld <redacted>
---
  include/linux/sched/isolation.h | 4 ++++
  kernel/sched/isolation.c        | 5 +++--
  2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/include/linux/sched/isolation.h b/include/linux/sched/isolation.h
index d8501f4709b5..c7cf6934489c 100644
--- a/include/linux/sched/isolation.h
+++ b/include/linux/sched/isolation.h

@@ -7,8 +7,12 @@
  #include <linux/tick.h>
  
  enum hk_type {
+	/* Inverse of boot-time isolcpus= argument */
+	HK_TYPE_DOMAIN_BOOT,
  	HK_TYPE_DOMAIN,
+	/* Inverse of boot-time isolcpus=managed_irq argument */
  	HK_TYPE_MANAGED_IRQ,
+	/* Inverse of boot-time nohz_full= or isolcpus=nohz arguments */
  	HK_TYPE_KERNEL_NOISE,
  	HK_TYPE_MAX,
  

diff --git a/kernel/sched/isolation.c b/kernel/sched/isolation.c
index 3ad0d6df6a0a..11a623fa6320 100644
--- a/kernel/sched/isolation.c
+++ b/kernel/sched/isolation.c

@@ -11,6 +11,7 @@
  #include "sched.h"
  
  enum hk_flags {
+	HK_FLAG_DOMAIN_BOOT	= BIT(HK_TYPE_DOMAIN_BOOT),
  	HK_FLAG_DOMAIN		= BIT(HK_TYPE_DOMAIN),
  	HK_FLAG_MANAGED_IRQ	= BIT(HK_TYPE_MANAGED_IRQ),
  	HK_FLAG_KERNEL_NOISE	= BIT(HK_TYPE_KERNEL_NOISE),

@@ -239,7 +240,7 @@ static int __init housekeeping_isolcpus_setup(char *str)
  
  		if (!strncmp(str, "domain,", 7)) {
  			str += 7;
-			flags |= HK_FLAG_DOMAIN;
+			flags |= HK_FLAG_DOMAIN | HK_FLAG_DOMAIN_BOOT;
  			continue;
  		}
  

@@ -269,7 +270,7 @@ static int __init housekeeping_isolcpus_setup(char *str)
  
  	/* Default behaviour for isolcpus without flags */
  	if (!flags)
-		flags |= HK_FLAG_DOMAIN;
+		flags |= HK_FLAG_DOMAIN | HK_FLAG_DOMAIN_BOOT;
  
  	return housekeeping_setup(str, flags);
  }