Suzuki K Poulose 3a8710392d coresight: tmc-etr: alloc_perf_buf: Do not call smp_processor_id from preemptible ... During a perf session we try to allocate buffers on the "node" associated with the CPU the event is bound to. If it is not bound to a CPU, we use the current CPU node, using smp_processor_id(). However this is unsafe in a pre-emptible context and could generate the splats as below : BUG: using smp_processor_id() in preemptible [00000000] code: perf/1743 caller is tmc_alloc_etr_buffer+0x1bc/0x1f0 CPU: 1 PID: 1743 Comm: perf Not tainted 5.1.0-rc6-147786-g116841e #344 Hardware name: ARM LTD ARM Juno Development Platform/ARM Juno Development Platform, BIOS EDK II Feb 1 2019 Call trace: dump_backtrace+0x0/0x150 show_stack+0x14/0x20 dump_stack+0x9c/0xc4 debug_smp_processor_id+0x10c/0x110 tmc_alloc_etr_buffer+0x1bc/0x1f0 etm_setup_aux+0x1c4/0x230 rb_alloc_aux+0x1b8/0x2b8 perf_mmap+0x35c/0x478 mmap_region+0x34c/0x4f0 do_mmap+0x2d8/0x418 vm_mmap_pgoff+0xd0/0xf8 ksys_mmap_pgoff+0x88/0xf8 __arm64_sys_mmap+0x28/0x38 el0_svc_handler+0xd8/0x138 el0_svc+0x8/0xc Use NUMA_NO_NODE hint instead of using the current node for events not bound to CPUs. Fixes: 22f429f19c ("coresight: etm-perf: Add support for ETR backend") Cc: Mathieu Poirier <mathieu.poirier@linaro.org> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com> Cc: stable <stable@vger.kernel.org> # 4.20+ Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org> Link: https://lore.kernel.org/r/20190620221237.3536-3-mathieu.poirier@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2019-07-03 21:15:33 +02:00
..
coresight-catu.c	coresight: Use platform agnostic names	2019-06-20 07:56:13 +02:00
coresight-catu.h	coresight: catu: Cleanup device specific data	2019-06-19 20:29:14 +02:00
coresight-cpu-debug.c	coresight: Make device to CPU mapping generic	2019-06-20 07:56:11 +02:00
coresight-etb10.c	coresight: Use platform agnostic names	2019-06-20 07:56:13 +02:00
coresight-etm3x-sysfs.c	coresight: etm: Clean up device specific data	2019-06-19 20:29:14 +02:00
coresight-etm3x.c	coresight: Use platform agnostic names	2019-06-20 07:56:13 +02:00
coresight-etm4x-sysfs.c	coresight: etm4x: Don't use contextID with PID namespaces	2018-07-15 13:52:56 +02:00
coresight-etm4x.c	coresight: Use platform agnostic names	2019-06-20 07:56:13 +02:00
coresight-etm4x.h	coresight: etm: Clean up device specific data	2019-06-19 20:29:14 +02:00
coresight-etm-cp14.c	coresight: Moving framework and drivers to SPDX identifier	2018-05-14 16:19:59 +02:00
coresight-etm-perf.c	coresight: Use coresight device names for sinks in PMU attribute	2019-06-19 20:29:14 +02:00
coresight-etm-perf.h	coresight: perf: Add "sinks" group to PMU directory	2019-02-08 12:27:36 +01:00
coresight-etm.h	coresight: etm: Clean up device specific data	2019-06-19 20:29:14 +02:00
coresight-funnel.c	coresight: Use platform agnostic names	2019-06-20 07:56:13 +02:00
coresight-platform.c	coresight: Add dummy definition for of_coresight_get_cpu()	2019-06-20 07:56:15 +02:00
coresight-priv.h	coresight: Use fwnode handle instead of device names	2019-06-20 07:56:13 +02:00
coresight-replicator.c	coresight: replicator: Add terminate entry for acpi_device_id tables	2019-06-20 08:06:56 +02:00
coresight-stm.c	coresight: stm: ACPI support for parsing stimulus base	2019-06-20 07:56:14 +02:00
coresight-tmc-etf.c	coresight: tmc: Clean up device specific data	2019-06-19 20:29:14 +02:00
coresight-tmc-etr.c	coresight: tmc-etr: alloc_perf_buf: Do not call smp_processor_id from preemptible	2019-07-03 21:15:33 +02:00
coresight-tmc.c	coresight: Use platform agnostic names	2019-06-20 07:56:13 +02:00
coresight-tmc.h	coresight: tmc: Clean up device specific data	2019-06-19 20:29:14 +02:00
coresight-tpiu.c	coresight: Use platform agnostic names	2019-06-20 07:56:13 +02:00
coresight.c	coresight: Use platform agnostic names	2019-06-20 07:56:13 +02:00
Kconfig	coresight: platform: add OF/APCI dependency	2019-06-20 08:06:56 +02:00
Makefile	coresight: Rename of_coresight to coresight-platform	2019-06-20 07:56:10 +02:00