x86: drop dumpstack ; removed in mainline c8fe4609827aedc9

2 files changed, 0 insertions, 78 deletions

diff --git a/patches/dump-stack-don-t-disable-preemption-during-trace.patch b/patches/dump-stack-don-t-disable-preemption-during-trace.patch
deleted file mode 100644
index 94597b5d8a5da..0000000000000
--- a/patches/dump-stack-don-t-disable-preemption-during-trace.patch
+++ /dev/null
@@ -1,77 +0,0 @@
-From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
-Date: Sun, 16 Aug 2015 14:27:50 +0200
-Subject: dump stack: don't disable preemption during trace
-
-I see here large latencies during a stack dump on x86. The
-preempt_disable() and get_cpu() should forbid moving the task to another
-CPU during a stack dump and avoiding two stack traces in parallel on the
-same CPU. However a stack trace from a second CPU may still happen in
-parallel. Also nesting is allowed so a stack trace happens in
-process-context and we may have another one from IRQ context. With migrate
-disable we keep this code preemptible and allow a second backtrace on
-the same CPU by another task.
-
-Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
----
- arch/x86/kernel/dumpstack_32.c |    4 ++--
- arch/x86/kernel/dumpstack_64.c |    8 ++++----
- 2 files changed, 6 insertions(+), 6 deletions(-)
-
---- a/arch/x86/kernel/dumpstack_32.c
-+++ b/arch/x86/kernel/dumpstack_32.c
-@@ -42,7 +42,7 @@ void dump_trace(struct task_struct *task
- 		unsigned long *stack, unsigned long bp,
- 		const struct stacktrace_ops *ops, void *data)
- {
--	const unsigned cpu = get_cpu();
-+	const unsigned cpu = get_cpu_light();
- 	int graph = 0;
- 	u32 *prev_esp;
- 
-@@ -84,7 +84,7 @@ void dump_trace(struct task_struct *task
- 			break;
- 		touch_nmi_watchdog();
- 	}
--	put_cpu();
-+	put_cpu_light();
- }
- EXPORT_SYMBOL(dump_trace);
- 
---- a/arch/x86/kernel/dumpstack_64.c
-+++ b/arch/x86/kernel/dumpstack_64.c
-@@ -152,7 +152,7 @@ void dump_trace(struct task_struct *task
- 		unsigned long *stack, unsigned long bp,
- 		const struct stacktrace_ops *ops, void *data)
- {
--	const unsigned cpu = get_cpu();
-+	const unsigned cpu = get_cpu_light();
- 	unsigned long *irq_stack = (unsigned long *)per_cpu(irq_stack_ptr, cpu);
- 	unsigned long dummy;
- 	unsigned used = 0;
-@@ -239,7 +239,7 @@ void dump_trace(struct task_struct *task
- 	 * This handles the process stack:
- 	 */
- 	bp = ops->walk_stack(task, stack, bp, ops, data, NULL, &graph);
--	put_cpu();
-+	put_cpu_light();
- }
- EXPORT_SYMBOL(dump_trace);
- 
-@@ -253,7 +253,7 @@ show_stack_log_lvl(struct task_struct *t
- 	int cpu;
- 	int i;
- 
--	preempt_disable();
-+	migrate_disable();
- 	cpu = smp_processor_id();
- 
- 	irq_stack_end	= (unsigned long *)(per_cpu(irq_stack_ptr, cpu));
-@@ -299,7 +299,7 @@ show_stack_log_lvl(struct task_struct *t
- 		stack++;
- 		touch_nmi_watchdog();
- 	}
--	preempt_enable();
-+	migrate_enable();
- 
- 	pr_cont("\n");
- 	show_trace_log_lvl(task, regs, sp, bp, log_lvl);
diff --git a/patches/series b/patches/series
index 061f61f77f22f..295380d343933 100644
--- a/patches/series
+++ b/patches/series
@@ -381,7 +381,6 @@ mm-vmalloc-use-get-cpu-light.patch
 block-mq-use-cpu_light.patch
 block-mq-drop-preempt-disable.patch
 block-mq-don-t-complete-requests-via-IPI.patch
-dump-stack-don-t-disable-preemption-during-trace.patch
 md-raid5-percpu-handling-rt-aware.patch
 
 # CPU CHILL