[PATCH v4 4/7] Make sure task_struct is available for raw_smp_processor_id

[Keith Packard]

To allow architectures to use the 'cpu' field in task_struct for cpu
identification, the task_struct must be visible whereever the
raw_smp_processor_id macro is used. It would be simplest to include
linux/sched.h from the relevant asm/smp.h file, but that file is
included from linux/sched.h, and the recursive include ends up with
several declarations in the wrong order.

To avoid this, the PowerPC architecture code has this ugly hack:

	#define raw_smp_processor_id() \
		(*(unsigned int *)((void *)current + _TASK_CPU))

As an alternative, placing includes of linux/sched.h in a few files
that are used along with asm/smp.h means we can use the task_struct
field directly.

Signed-off-by: Keith Packard <keithpac@xxxxxxxxxx>
---
 arch/arm/mm/proc-v7-bugs.c     | 1 +
 drivers/vhost/vhost.c          | 1 +
 drivers/vhost/vhost.h          | 1 +
 include/asm-generic/irq_regs.h | 1 +
 include/linux/of_address.h     | 1 +
 include/linux/random.h         | 1 +
 include/linux/topology.h       | 1 +
 init/calibrate.c               | 1 +
 kernel/bpf/bpf_lru_list.h      | 1 +
 kernel/bpf/percpu_freelist.h   | 1 +
 kernel/sched/cpuacct.c         | 2 +-
 lib/irq_regs.c                 | 1 +
 12 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/arch/arm/mm/proc-v7-bugs.c b/arch/arm/mm/proc-v7-bugs.c
index 114c05ab4dd9..9ea078c619a7 100644
--- a/arch/arm/mm/proc-v7-bugs.c
+++ b/arch/arm/mm/proc-v7-bugs.c
@@ -1,4 +1,5 @@
 // SPDX-License-Identifier: GPL-2.0
+#include <linux/sched.h>
 #include <linux/arm-smccc.h>
 #include <linux/kernel.h>
 #include <linux/smp.h>
diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
index 5ccb0705beae..e5a073bb5b1e 100644
--- a/drivers/vhost/vhost.c
+++ b/drivers/vhost/vhost.c
@@ -10,6 +10,7 @@
  * Generic code for virtio server in host kernel.
  */
 
+#include <linux/sched.h>
 #include <linux/eventfd.h>
 #include <linux/vhost.h>
 #include <linux/uio.h>
diff --git a/drivers/vhost/vhost.h b/drivers/vhost/vhost.h
index b063324c7669..963d08ff2a62 100644
--- a/drivers/vhost/vhost.h
+++ b/drivers/vhost/vhost.h
@@ -2,6 +2,7 @@
 #ifndef _VHOST_H
 #define _VHOST_H
 
+#include <linux/sched.h>
 #include <linux/eventfd.h>
 #include <linux/vhost.h>
 #include <linux/mm.h>
diff --git a/include/asm-generic/irq_regs.h b/include/asm-generic/irq_regs.h
index 2e7c6e89d42e..ab4ca7ab362c 100644
--- a/include/asm-generic/irq_regs.h
+++ b/include/asm-generic/irq_regs.h
@@ -8,6 +8,7 @@
 #ifndef _ASM_GENERIC_IRQ_REGS_H
 #define _ASM_GENERIC_IRQ_REGS_H
 
+#include <linux/sched.h>
 #include <linux/percpu.h>
 
 /*
diff --git a/include/linux/of_address.h b/include/linux/of_address.h
index 88bc943405cd..60c30168d48d 100644
--- a/include/linux/of_address.h
+++ b/include/linux/of_address.h
@@ -1,6 +1,7 @@
 /* SPDX-License-Identifier: GPL-2.0 */
 #ifndef __OF_ADDRESS_H
 #define __OF_ADDRESS_H
+#include <linux/sched.h>
 #include <linux/ioport.h>
 #include <linux/errno.h>
 #include <linux/of.h>
diff --git a/include/linux/random.h b/include/linux/random.h
index f45b8be3e3c4..0accd9277e95 100644
--- a/include/linux/random.h
+++ b/include/linux/random.h
@@ -7,6 +7,7 @@
 #ifndef _LINUX_RANDOM_H
 #define _LINUX_RANDOM_H
 
+#include <linux/sched.h>
 #include <linux/bug.h>
 #include <linux/kernel.h>
 #include <linux/list.h>
diff --git a/include/linux/topology.h b/include/linux/topology.h
index 7634cd737061..4bd993bc9513 100644
--- a/include/linux/topology.h
+++ b/include/linux/topology.h
@@ -27,6 +27,7 @@
 #ifndef _LINUX_TOPOLOGY_H
 #define _LINUX_TOPOLOGY_H
 
+#include <linux/sched.h>
 #include <linux/arch_topology.h>
 #include <linux/cpumask.h>
 #include <linux/bitops.h>
diff --git a/init/calibrate.c b/init/calibrate.c
index f3831272f113..45002e27e385 100644
--- a/init/calibrate.c
+++ b/init/calibrate.c
@@ -10,6 +10,7 @@
 #include <linux/init.h>
 #include <linux/timex.h>
 #include <linux/smp.h>
+#include <linux/sched.h>
 #include <linux/percpu.h>
 
 unsigned long lpj_fine;
diff --git a/kernel/bpf/bpf_lru_list.h b/kernel/bpf/bpf_lru_list.h
index 6b12f06ee18c..5aed0c288c76 100644
--- a/kernel/bpf/bpf_lru_list.h
+++ b/kernel/bpf/bpf_lru_list.h
@@ -4,6 +4,7 @@
 #ifndef __BPF_LRU_LIST_H_
 #define __BPF_LRU_LIST_H_
 
+#include <linux/sched.h>
 #include <linux/list.h>
 #include <linux/spinlock_types.h>
 
diff --git a/kernel/bpf/percpu_freelist.h b/kernel/bpf/percpu_freelist.h
index 3c76553cfe57..3bc7a2bbe79b 100644
--- a/kernel/bpf/percpu_freelist.h
+++ b/kernel/bpf/percpu_freelist.h
@@ -3,6 +3,7 @@
  */
 #ifndef __PERCPU_FREELIST_H__
 #define __PERCPU_FREELIST_H__
+#include <linux/sched.h>
 #include <linux/spinlock.h>
 #include <linux/percpu.h>
 
diff --git a/kernel/sched/cpuacct.c b/kernel/sched/cpuacct.c
index 104a1bade14f..fb5f52e889a4 100644
--- a/kernel/sched/cpuacct.c
+++ b/kernel/sched/cpuacct.c
@@ -5,8 +5,8 @@
  * Based on the work by Paul Menage (menage@xxxxxxxxxx) and Balbir Singh
  * (balbir@xxxxxxxxxx).
  */
-#include <asm/irq_regs.h>
 #include "sched.h"
+#include <asm/irq_regs.h>
 
 /* Time spent by the tasks of the CPU accounting group executing in ... */
 enum cpuacct_stat_index {
diff --git a/lib/irq_regs.c b/lib/irq_regs.c
index 0d545a93070e..c9d8235f6444 100644
--- a/lib/irq_regs.c
+++ b/lib/irq_regs.c
@@ -5,6 +5,7 @@
  * Written by David Howells (dhowells@xxxxxxxxxx)
  */
 #include <linux/export.h>
+#include <linux/sched.h>
 #include <linux/percpu.h>
 #include <asm/irq_regs.h>
 
-- 
2.33.0