#include #include #include /* Must not be static to force gcc to consider these non constant */ char *trace_printk_test_global_str = "This is a dynamic string that will use trace_puts\n"; char *trace_printk_test_global_str_irq = "(irq) This is a dynamic string that will use trace_puts\n"; char *trace_printk_test_global_str_fmt = "%sThis is a %s that will use trace_printk\n"; static struct irq_work irqwork; static void trace_printk_irq_work(struct irq_work *work) { trace_printk("(irq) This is a static string that will use trace_bputs\n"); trace_printk(trace_printk_test_global_str_irq); trace_printk("(irq) This is a %s that will use trace_bprintk()\n", "static string"); trace_printk(trace_printk_test_global_str_fmt, "(irq) ", "dynamic string"); } static int __init trace_printk_init(void) { init_irq_work(&irqwork, trace_printk_irq_work); trace_printk("This is a static string that will use trace_bputs\n"); trace_printk(trace_printk_test_global_str); /* Kick off printing in irq context */ irq_work_queue(&irqwork); trace_printk("This is a %s that will use trace_bprintk()\n", "static string"); trace_printk(trace_printk_test_global_str_fmt, "", "dynamic string"); return 0; } static void __exit trace_printk_exit(void) { } module_init(trace_printk_init); module_exit(trace_printk_exit); MODULE_AUTHOR("Steven Rostedt"); MODULE_DESCRIPTION("trace-printk"); MODULE_LICENSE("GPL"); user
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authorJoonyoung Shim <jy0922.shim@samsung.com>2017-01-17 13:54:36 +0900
committerThomas Gleixner <tglx@linutronix.de>2017-01-17 10:08:38 +0100
commitbc7c36eedb0c7004aa06c2afc3c5385adada8fa3 (patch)
tree14ce1ae3cce8013aa4bc46297f6370ec0527be78 /tools/perf/arch/sparc/util
parent49def1853334396f948dcb4cedb9347abb318df5 (diff)
clocksource/exynos_mct: Clear interrupt when cpu is shut down
When a CPU goes offline a potentially pending timer interrupt is not cleared. When the CPU comes online again then the pending interrupt is delivered before the per cpu clockevent device is initialized. As a consequence the tick interrupt handler dereferences a NULL pointer. [ 51.251378] Unable to handle kernel NULL pointer dereference at virtual address 00000040 [ 51.289348] task: ee942d00 task.stack: ee960000 [ 51.293861] PC is at tick_periodic+0x38/0xb0 [ 51.298102] LR is at tick_handle_periodic+0x1c/0x90 Clear the pending interrupt in the cpu dying path. Fixes: 56a94f13919c ("clocksource: exynos_mct: Avoid blocking calls in the cpu hotplug notifier") Reported-by: Seung-Woo Kim <sw0312.kim@samsung.com> Signed-off-by: Joonyoung Shim <jy0922.shim@samsung.com> Cc: linux-samsung-soc@vger.kernel.org Cc: cw00.choi@samsung.com Cc: daniel.lezcano@linaro.org Cc: stable@vger.kernel.org Cc: javier@osg.samsung.com Cc: kgene@kernel.org Cc: krzk@kernel.org Cc: linux-arm-kernel@lists.infradead.org Link: http://lkml.kernel.org/r/1484628876-22065-1-git-send-email-jy0922.shim@samsung.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'tools/perf/arch/sparc/util')