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Subject[PATCH] Use list heads for task list
This patch (against 2.5.6-pre1) converts prev_task and next_task in the
task_struct to use list heads.

--

Brian Gerstdiff -urN linux-2.5.6-pre1/arch/alpha/kernel/smp.c linux/arch/alpha/kernel/smp.c
--- linux-2.5.6-pre1/arch/alpha/kernel/smp.c Wed Feb 20 01:47:29 2002
+++ linux/arch/alpha/kernel/smp.c Tue Feb 26 22:53:02 2002
@@ -460,7 +460,7 @@
if (fork_by_hand() < 0)
panic("failed fork for CPU %d", cpuid);

- idle = init_task.prev_task;
+ idle = LAST_TASK;
if (!idle)
panic("No idle process for CPU %d", cpuid);

diff -urN linux-2.5.6-pre1/arch/i386/kernel/smpboot.c linux/arch/i386/kernel/smpboot.c
--- linux-2.5.6-pre1/arch/i386/kernel/smpboot.c Wed Feb 20 01:47:29 2002
+++ linux/arch/i386/kernel/smpboot.c Tue Feb 26 22:53:02 2002
@@ -828,7 +828,7 @@
* We remove it from the pidhash and the runqueue
* once we got the process:
*/
- idle = init_task.prev_task;
+ idle = LAST_TASK;
if (!idle)
panic("No idle process for CPU %d", cpu);

diff -urN linux-2.5.6-pre1/arch/ia64/kernel/smpboot.c linux/arch/ia64/kernel/smpboot.c
--- linux-2.5.6-pre1/arch/ia64/kernel/smpboot.c Wed Nov 21 13:31:09 2001
+++ linux/arch/ia64/kernel/smpboot.c Tue Feb 26 22:53:02 2002
@@ -412,7 +412,7 @@
* We remove it from the pidhash and the runqueue
* once we got the process:
*/
- idle = init_task.prev_task;
+ idle = LAST_TASK;
if (!idle)
panic("No idle process for CPU %d", cpu);

diff -urN linux-2.5.6-pre1/arch/mips/kernel/smp.c linux/arch/mips/kernel/smp.c
--- linux-2.5.6-pre1/arch/mips/kernel/smp.c Wed Feb 6 11:47:02 2002
+++ linux/arch/mips/kernel/smp.c Tue Feb 26 22:53:02 2002
@@ -123,7 +123,7 @@
/* Spawn a new process normally. Grab a pointer to
its task struct so we can mess with it */
do_fork(CLONE_VM|CLONE_PID, 0, &regs, 0);
- p = init_task.prev_task;
+ p = LAST_TASK;

/* Schedule the first task manually */
p->processor = i;
@@ -152,7 +152,7 @@
* Linux can schedule processes on this slave.
*/
kernel_thread(0, NULL, CLONE_PID);
- p = init_task.prev_task;
+ p = LAST_TASK;
sprintf(p->comm, "%s%d", "Idle", i);
init_tasks[i] = p;
p->processor = i;
diff -urN linux-2.5.6-pre1/arch/mips64/sgi-ip27/ip27-init.c linux/arch/mips64/sgi-ip27/ip27-init.c
--- linux-2.5.6-pre1/arch/mips64/sgi-ip27/ip27-init.c Wed Nov 21 13:31:09 2001
+++ linux/arch/mips64/sgi-ip27/ip27-init.c Tue Feb 26 22:53:02 2002
@@ -491,7 +491,7 @@
* Linux can schedule processes on this slave.
*/
kernel_thread(0, NULL, CLONE_PID);
- p = init_task.prev_task;
+ p = LAST_TASK;
sprintf(p->comm, "%s%d", "Idle", num_cpus);
init_tasks[num_cpus] = p;
alloc_cpupda(cpu, num_cpus);
diff -urN linux-2.5.6-pre1/arch/ppc/kernel/smp.c linux/arch/ppc/kernel/smp.c
--- linux-2.5.6-pre1/arch/ppc/kernel/smp.c Wed Feb 20 01:47:30 2002
+++ linux/arch/ppc/kernel/smp.c Tue Feb 26 22:53:02 2002
@@ -364,7 +364,7 @@
memset(&regs, 0, sizeof(struct pt_regs));
if (do_fork(CLONE_VM|CLONE_PID, 0, &regs, 0) < 0)
panic("failed fork for CPU %d", i);
- p = init_task.prev_task;
+ p = LAST_TASK;
if (!p)
panic("No idle task for CPU %d", i);
init_idle(p, i);
diff -urN linux-2.5.6-pre1/arch/ppc64/kernel/smp.c linux/arch/ppc64/kernel/smp.c
--- linux-2.5.6-pre1/arch/ppc64/kernel/smp.c Wed Feb 20 01:47:31 2002
+++ linux/arch/ppc64/kernel/smp.c Tue Feb 26 22:53:02 2002
@@ -669,7 +669,7 @@

if (do_fork(CLONE_VM|CLONE_PID, 0, &regs, 0) < 0)
panic("failed fork for CPU %d", i);
- p = init_task.prev_task;
+ p = LAST_TASK;
if (!p)
panic("No idle task for CPU %d", i);

diff -urN linux-2.5.6-pre1/arch/s390/kernel/smp.c linux/arch/s390/kernel/smp.c
--- linux-2.5.6-pre1/arch/s390/kernel/smp.c Wed Feb 6 11:46:55 2002
+++ linux/arch/s390/kernel/smp.c Tue Feb 26 22:53:02 2002
@@ -528,7 +528,7 @@
* We remove it from the pidhash and the runqueue
* once we got the process:
*/
- idle = init_task.prev_task;
+ idle = LAST_TASK;
if (!idle)
panic("No idle process for CPU %d",cpu);
idle->processor = cpu;
diff -urN linux-2.5.6-pre1/arch/s390x/kernel/smp.c linux/arch/s390x/kernel/smp.c
--- linux-2.5.6-pre1/arch/s390x/kernel/smp.c Wed Feb 6 11:46:55 2002
+++ linux/arch/s390x/kernel/smp.c Tue Feb 26 22:53:02 2002
@@ -507,7 +507,7 @@
* We remove it from the pidhash and the runqueue
* once we got the process:
*/
- idle = init_task.prev_task;
+ idle = LAST_TASK;
if (!idle)
panic("No idle process for CPU %d",cpu);
idle->processor = cpu;
diff -urN linux-2.5.6-pre1/arch/sparc/kernel/sun4d_smp.c linux/arch/sparc/kernel/sun4d_smp.c
--- linux-2.5.6-pre1/arch/sparc/kernel/sun4d_smp.c Wed Feb 6 11:46:55 2002
+++ linux/arch/sparc/kernel/sun4d_smp.c Tue Feb 26 22:53:02 2002
@@ -220,7 +220,7 @@

cpucount++;

- p = init_task.prev_task;
+ p = LAST_TASK;

p->cpu = i;

diff -urN linux-2.5.6-pre1/arch/sparc/kernel/sun4m_smp.c linux/arch/sparc/kernel/sun4m_smp.c
--- linux-2.5.6-pre1/arch/sparc/kernel/sun4m_smp.c Wed Feb 6 11:46:55 2002
+++ linux/arch/sparc/kernel/sun4m_smp.c Tue Feb 26 22:53:02 2002
@@ -193,7 +193,7 @@

cpucount++;

- p = init_task.prev_task;
+ p = LAST_TASK;

p->cpu = i;

diff -urN linux-2.5.6-pre1/arch/sparc64/kernel/smp.c linux/arch/sparc64/kernel/smp.c
--- linux-2.5.6-pre1/arch/sparc64/kernel/smp.c Mon Feb 11 10:21:43 2002
+++ linux/arch/sparc64/kernel/smp.c Tue Feb 26 22:53:02 2002
@@ -270,7 +270,7 @@
kernel_thread(NULL, NULL, CLONE_PID);
cpucount++;

- p = init_task.prev_task;
+ p = LAST_TASK;

init_idle(p, i);

diff -urN linux-2.5.6-pre1/arch/x86_64/kernel/smpboot.c linux/arch/x86_64/kernel/smpboot.c
--- linux-2.5.6-pre1/arch/x86_64/kernel/smpboot.c Wed Feb 20 01:47:31 2002
+++ linux/arch/x86_64/kernel/smpboot.c Tue Feb 26 22:53:02 2002
@@ -559,7 +559,7 @@
* We remove it from the pidhash and the runqueue
* once we got the process:
*/
- idle = init_task.prev_task;
+ idle = LAST_TASK;
if (!idle)
panic("No idle process for CPU %d", cpu);

diff -urN linux-2.5.6-pre1/include/linux/init_task.h linux/include/linux/init_task.h
--- linux-2.5.6-pre1/include/linux/init_task.h Tue Feb 26 23:56:18 2002
+++ linux/include/linux/init_task.h Wed Feb 27 00:40:43 2002
@@ -53,8 +53,7 @@
active_mm: &init_mm, \
run_list: LIST_HEAD_INIT(tsk.run_list), \
time_slice: HZ, \
- next_task: &tsk, \
- prev_task: &tsk, \
+ task_list: LIST_HEAD_INIT(tsk.task_list), \
p_opptr: &tsk, \
p_pptr: &tsk, \
thread_group: LIST_HEAD_INIT(tsk.thread_group), \
diff -urN linux-2.5.6-pre1/include/linux/sched.h linux/include/linux/sched.h
--- linux-2.5.6-pre1/include/linux/sched.h Tue Feb 26 23:52:17 2002
+++ linux/include/linux/sched.h Wed Feb 27 00:36:21 2002
@@ -250,7 +250,7 @@
unsigned long cpus_allowed;
unsigned int time_slice;

- struct task_struct *next_task, *prev_task;
+ struct list_head task_list;

struct mm_struct *mm, *active_mm;
struct list_head local_pages;
@@ -716,8 +716,7 @@
})

#define REMOVE_LINKS(p) do { \
- (p)->next_task->prev_task = (p)->prev_task; \
- (p)->prev_task->next_task = (p)->next_task; \
+ list_del(&(p)->task_list); \
if ((p)->p_osptr) \
(p)->p_osptr->p_ysptr = (p)->p_ysptr; \
if ((p)->p_ysptr) \
@@ -727,18 +726,20 @@
} while (0)

#define SET_LINKS(p) do { \
- (p)->next_task = &init_task; \
- (p)->prev_task = init_task.prev_task; \
- init_task.prev_task->next_task = (p); \
- init_task.prev_task = (p); \
+ list_add_tail(&(p)->task_list, &init_task.task_list); \
(p)->p_ysptr = NULL; \
if (((p)->p_osptr = (p)->p_pptr->p_cptr) != NULL) \
(p)->p_osptr->p_ysptr = p; \
(p)->p_pptr->p_cptr = p; \
} while (0)

-#define for_each_task(p) \
- for (p = &init_task ; (p = p->next_task) != &init_task ; )
+#define LAST_TASK list_entry(init_task.task_list.prev, struct task_struct, task_list)
+
+#define for_each_task(task) \
+ for (task = next_task(&init_task) ; task != &init_task ; task = next_task(task))
+
+#define next_task(p) \
+ list_entry((p)->task_list.next, struct task_struct, task_list)

#define for_each_thread(task) \
for (task = next_thread(current) ; task != current ; task = next_thread(task))
\
 
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