parisc: add LATENCYTOP_SUPPORT and CONFIG_STACKTRACE_SUPPORT (548f1176) · Commits · e / devices / android_kernel_teracube_2e

arch/parisc/Kconfig

+6 −0

Original line number	Original line	Diff line number	Diff line
	@@ -75,6 +75,9 @@ config GENERIC_HARDIRQS
	config GENERIC_IRQ_PROBE		config GENERIC_IRQ_PROBE
	def_bool y		def_bool y

			config HAVE_LATENCYTOP_SUPPORT
			def_bool y

	config IRQ_PER_CPU		config IRQ_PER_CPU
	bool		bool
	default y		default y
	@@ -83,6 +86,9 @@ config IRQ_PER_CPU
	config PM		config PM
	bool		bool

			config STACKTRACE_SUPPORT
			def_bool y

	config ISA_DMA_API		config ISA_DMA_API
	bool		bool

arch/parisc/kernel/Makefile

+1 −0

Original line number	Original line	Diff line number	Diff line
	@@ -16,5 +16,6 @@ obj-$(CONFIG_PA11) += pci-dma.o
	obj-$(CONFIG_PCI) += pci.o		obj-$(CONFIG_PCI) += pci.o
	obj-$(CONFIG_MODULES) += module.o		obj-$(CONFIG_MODULES) += module.o
	obj-$(CONFIG_64BIT) += binfmt_elf32.o sys_parisc32.o signal32.o		obj-$(CONFIG_64BIT) += binfmt_elf32.o sys_parisc32.o signal32.o
			obj-$(CONFIG_STACKTRACE)+= stacktrace.o
	# only supported for PCX-W/U in 64-bit mode at the moment		# only supported for PCX-W/U in 64-bit mode at the moment
	obj-$(CONFIG_64BIT) += perf.o perf_asm.o		obj-$(CONFIG_64BIT) += perf.o perf_asm.o

arch/parisc/kernel/stacktrace.c

0 → 100644

+63 −0

Original line number	Original line	Diff line number	Diff line
			/*
			* Stack trace management functions
			*
			* Copyright (C) 2009 Helge Deller <deller@gmx.de>
			* based on arch/x86/kernel/stacktrace.c by Ingo Molnar <mingo@redhat.com>
			* and parisc unwind functions by Randolph Chung <tausq@debian.org>
			*
			* TODO: Userspace stacktrace (CONFIG_USER_STACKTRACE_SUPPORT)
			*/
			#include <linux/module.h>
			#include <linux/stacktrace.h>

			#include <asm/unwind.h>

			static void dump_trace(struct task_struct task, struct stack_trace trace)
			{
			struct unwind_frame_info info;

			/* initialize unwind info */
			if (task == current) {
			unsigned long sp;
			struct pt_regs r;
			HERE:
			asm volatile ("copy %%r30, %0" : "=r"(sp));
			memset(&r, 0, sizeof(struct pt_regs));
			r.iaoq[0] = (unsigned long)&&HERE;
			r.gr[2] = (unsigned long)__builtin_return_address(0);
			r.gr[30] = sp;
			unwind_frame_init(&info, task, &r);
			} else {
			unwind_frame_init_from_blocked_task(&info, task);
			}

			/* unwind stack and save entries in stack_trace struct */
			trace->nr_entries = 0;
			while (trace->nr_entries < trace->max_entries) {
			if (unwind_once(&info) < 0 \|\| info.ip == 0)
			break;

			if (__kernel_text_address(info.ip))
			trace->entries[trace->nr_entries++] = info.ip;
			}
			}


			/*
			* Save stack-backtrace addresses into a stack_trace buffer.
			*/
			void save_stack_trace(struct stack_trace *trace)
			{
			dump_trace(current, trace);
			if (trace->nr_entries < trace->max_entries)
			trace->entries[trace->nr_entries++] = ULONG_MAX;
			}
			EXPORT_SYMBOL_GPL(save_stack_trace);

			void save_stack_trace_tsk(struct task_struct tsk, struct stack_trace trace)
			{
			dump_trace(tsk, trace);
			if (trace->nr_entries < trace->max_entries)
			trace->entries[trace->nr_entries++] = ULONG_MAX;
			}
			EXPORT_SYMBOL_GPL(save_stack_trace_tsk);