From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
stable@vger.kernel.org,
Pavankumar Kondeti <pkondeti@codeaurora.org>,
"Steven Rostedt (VMware)" <rostedt@goodmis.org>
Subject: [PATCH 4.19 08/41] sched, trace: Fix prev_state output in sched_switch tracepoint
Date: Thu, 6 Dec 2018 15:38:48 +0100 [thread overview]
Message-ID: <20181206142950.374863674@linuxfoundation.org> (raw)
In-Reply-To: <20181206142949.757402551@linuxfoundation.org>
4.19-stable review patch. If anyone has any objections, please let me know.
------------------
From: Pavankumar Kondeti <pkondeti@codeaurora.org>
commit 3054426dc68e5d63aa6a6e9b91ac4ec78e3f3805 upstream.
commit 3f5fe9fef5b2 ("sched/debug: Fix task state recording/printout")
tried to fix the problem introduced by a previous commit efb40f588b43
("sched/tracing: Fix trace_sched_switch task-state printing"). However
the prev_state output in sched_switch is still broken.
task_state_index() uses fls() which considers the LSB as 1. Left
shifting 1 by this value gives an incorrect mapping to the task state.
Fix this by decrementing the value returned by __get_task_state()
before shifting.
Link: http://lkml.kernel.org/r/1540882473-1103-1-git-send-email-pkondeti@codeaurora.org
Cc: stable@vger.kernel.org
Fixes: 3f5fe9fef5b2 ("sched/debug: Fix task state recording/printout")
Signed-off-by: Pavankumar Kondeti <pkondeti@codeaurora.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
include/trace/events/sched.h | 12 +++++++++++-
1 file changed, 11 insertions(+), 1 deletion(-)
--- a/include/trace/events/sched.h
+++ b/include/trace/events/sched.h
@@ -107,6 +107,8 @@ DEFINE_EVENT(sched_wakeup_template, sche
#ifdef CREATE_TRACE_POINTS
static inline long __trace_sched_switch_state(bool preempt, struct task_struct *p)
{
+ unsigned int state;
+
#ifdef CONFIG_SCHED_DEBUG
BUG_ON(p != current);
#endif /* CONFIG_SCHED_DEBUG */
@@ -118,7 +120,15 @@ static inline long __trace_sched_switch_
if (preempt)
return TASK_REPORT_MAX;
- return 1 << task_state_index(p);
+ /*
+ * task_state_index() uses fls() and returns a value from 0-8 range.
+ * Decrement it by 1 (except TASK_RUNNING state i.e 0) before using
+ * it for left shift operation to get the correct task->state
+ * mapping.
+ */
+ state = task_state_index(p);
+
+ return state ? (1 << (state - 1)) : state;
}
#endif /* CREATE_TRACE_POINTS */
next prev parent reply other threads:[~2018-12-06 14:41 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-12-06 14:38 [PATCH 4.19 00/41] 4.19.8-stable review Greg Kroah-Hartman
2018-12-06 14:38 ` [PATCH 4.19 01/41] blk-mq: fix corruption with direct issue Greg Kroah-Hartman
2018-12-06 14:38 ` [PATCH 4.19 02/41] test_hexdump: use memcpy instead of strncpy Greg Kroah-Hartman
2018-12-06 14:38 ` [PATCH 4.19 03/41] unifdef: " Greg Kroah-Hartman
2018-12-06 14:38 ` [PATCH 4.19 04/41] iser: set sector for ambiguous mr status errors Greg Kroah-Hartman
2018-12-06 14:38 ` [PATCH 4.19 05/41] uprobes: Fix handle_swbp() vs. unregister() + register() race once more Greg Kroah-Hartman
2018-12-06 14:38 ` [PATCH 4.19 06/41] mtd: nand: Fix memory allocation in nanddev_bbt_init() Greg Kroah-Hartman
2018-12-06 14:38 ` [PATCH 4.19 07/41] arm64: ftrace: Fix to enable syscall events on arm64 Greg Kroah-Hartman
2018-12-06 14:38 ` Greg Kroah-Hartman [this message]
2018-12-06 14:38 ` [PATCH 4.19 09/41] tracepoint: Use __idx instead of idx in DO_TRACE macro to make it unique Greg Kroah-Hartman
2018-12-06 14:38 ` [PATCH 4.19 10/41] MIPS: ralink: Fix mt7620 nd_sd pinmux Greg Kroah-Hartman
2018-12-06 14:38 ` [PATCH 4.19 11/41] mips: fix mips_get_syscall_arg o32 check Greg Kroah-Hartman
2018-12-06 14:38 ` [PATCH 4.19 12/41] IB/mlx5: Avoid load failure due to unknown link width Greg Kroah-Hartman
2018-12-06 14:38 ` [PATCH 4.19 13/41] tracing/fgraph: Fix set_graph_function from showing interrupts Greg Kroah-Hartman
2018-12-06 14:38 ` [PATCH 4.19 14/41] drm/ast: Fix incorrect free on ioregs Greg Kroah-Hartman
2018-12-06 14:38 ` [PATCH 4.19 15/41] drm/amd/dm: Dont forget to attach MST encoders Greg Kroah-Hartman
2018-12-06 14:38 ` [PATCH 4.19 16/41] drm/amd/dm: Understand why attaching path/tile properties are needed Greg Kroah-Hartman
2018-12-06 14:38 ` [PATCH 4.19 17/41] drm: set is_master to 0 upon drm_new_set_master() failure Greg Kroah-Hartman
2018-12-06 14:38 ` [PATCH 4.19 18/41] drm/meson: Fixes for drm_crtc_vblank_on/off support Greg Kroah-Hartman
2018-12-06 14:38 ` [PATCH 4.19 19/41] drm/meson: Enable fast_io in meson_dw_hdmi_regmap_config Greg Kroah-Hartman
2018-12-06 14:39 ` [PATCH 4.19 20/41] drm/meson: Fix OOB memory accesses in meson_viu_set_osd_lut() Greg Kroah-Hartman
2018-12-06 14:39 ` [PATCH 4.19 21/41] userfaultfd: use ENOENT instead of EFAULT if the atomic copy user fails Greg Kroah-Hartman
2018-12-06 14:39 ` [PATCH 4.19 22/41] userfaultfd: shmem: allocate anonymous memory for MAP_PRIVATE shmem Greg Kroah-Hartman
2018-12-06 14:39 ` [PATCH 4.19 23/41] userfaultfd: shmem: add i_size checks Greg Kroah-Hartman
2018-12-06 14:39 ` [PATCH 4.19 24/41] userfaultfd: shmem: UFFDIO_COPY: set the page dirty if VM_WRITE is not set Greg Kroah-Hartman
2018-12-06 14:39 ` [PATCH 4.19 25/41] kgdboc: Fix restrict error Greg Kroah-Hartman
2018-12-06 14:39 ` [PATCH 4.19 26/41] kgdboc: Fix warning with module build Greg Kroah-Hartman
2018-12-06 14:39 ` [PATCH 4.19 27/41] svm: Add mutex_lock to protect apic_access_page_done on AMD systems Greg Kroah-Hartman
2018-12-06 14:39 ` [PATCH 4.19 28/41] selinux: add support for RTM_NEWCHAIN, RTM_DELCHAIN, and RTM_GETCHAIN Greg Kroah-Hartman
2018-12-06 14:39 ` [PATCH 4.19 29/41] i40e: Fix deletion of MAC filters Greg Kroah-Hartman
2018-12-06 14:39 ` [PATCH 4.19 30/41] scsi: lpfc: fix block guard enablement on SLI3 adapters Greg Kroah-Hartman
2018-12-06 14:39 ` [PATCH 4.19 31/41] Input: xpad - quirk all PDP Xbox One gamepads Greg Kroah-Hartman
2018-12-06 14:39 ` [PATCH 4.19 32/41] Input: synaptics - add PNP ID for ThinkPad P50 to SMBus Greg Kroah-Hartman
2018-12-06 14:39 ` [PATCH 4.19 33/41] Input: matrix_keypad - check for errors from of_get_named_gpio() Greg Kroah-Hartman
2018-12-06 14:39 ` [PATCH 4.19 34/41] Input: cros_ec_keyb - fix button/switch capability reports Greg Kroah-Hartman
2018-12-06 14:39 ` [PATCH 4.19 35/41] Input: elan_i2c - add ELAN0620 to the ACPI table Greg Kroah-Hartman
2018-12-06 14:39 ` [PATCH 4.19 36/41] Input: elan_i2c - add ACPI ID for Lenovo IdeaPad 330-15ARR Greg Kroah-Hartman
2018-12-06 14:39 ` [PATCH 4.19 37/41] Input: elan_i2c - add support for ELAN0621 touchpad Greg Kroah-Hartman
2018-12-06 14:39 ` [PATCH 4.19 38/41] btrfs: tree-checker: Dont check max block group size as current max chunk size limit is unreliable Greg Kroah-Hartman
2018-12-06 14:39 ` [PATCH 4.19 39/41] ARC: change defconfig defaults to ARCv2 Greg Kroah-Hartman
2018-12-06 14:39 ` [PATCH 4.19 40/41] arc: [devboards] Add support of NFSv3 ACL Greg Kroah-Hartman
2018-12-06 14:39 ` [PATCH 4.19 41/41] tipc: use destination length for copy string Greg Kroah-Hartman
2018-12-06 20:32 ` [PATCH 4.19 00/41] 4.19.8-stable review kernelci.org bot
2018-12-06 22:10 ` shuah
2018-12-07 6:52 ` Greg Kroah-Hartman
2018-12-07 8:28 ` Naresh Kamboju
2018-12-07 20:31 ` Guenter Roeck
2018-12-08 9:02 ` Greg Kroah-Hartman
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