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From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@kernel.org>,
	"Peter Zijlstra (Intel)" <peterz@infradead.org>,
	Lee Jones <lee.jones@linaro.org>
Subject: [PATCH 4.9 09/32] futex: Set task::futex_state to DEAD right after handling futex exit
Date: Tue,  2 Feb 2021 14:38:32 +0100	[thread overview]
Message-ID: <20210202132942.398204529@linuxfoundation.org> (raw)
In-Reply-To: <20210202132942.035179752@linuxfoundation.org>

From: Thomas Gleixner <tglx@linutronix.de>

commit f24f22435dcc11389acc87e5586239c1819d217c upstream.

Setting task::futex_state in do_exit() is rather arbitrarily placed for no
reason. Move it into the futex code.

Note, this is only done for the exit cleanup as the exec cleanup cannot set
the state to FUTEX_STATE_DEAD because the task struct is still in active
use.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20191106224556.439511191@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 kernel/exit.c  |    1 -
 kernel/futex.c |    1 +
 2 files changed, 1 insertion(+), 1 deletion(-)

--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -867,7 +867,6 @@ void __noreturn do_exit(long code)
 	 * Make sure we are holding no locks:
 	 */
 	debug_check_no_locks_held();
-	futex_exit_done(tsk);
 
 	if (tsk->io_context)
 		exit_io_context(tsk);
--- a/kernel/futex.c
+++ b/kernel/futex.c
@@ -3290,6 +3290,7 @@ void futex_exec_release(struct task_stru
 void futex_exit_release(struct task_struct *tsk)
 {
 	futex_exec_release(tsk);
+	futex_exit_done(tsk);
 }
 
 long do_futex(u32 __user *uaddr, int op, u32 val, ktime_t *timeout,



  parent reply	other threads:[~2021-02-02 17:46 UTC|newest]

Thread overview: 37+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-02-02 13:38 [PATCH 4.9 00/32] 4.9.255-rc1 review Greg Kroah-Hartman
2021-02-02 13:38 ` [PATCH 4.9 01/32] ACPI: sysfs: Prefer "compatible" modalias Greg Kroah-Hartman
2021-02-02 13:38 ` [PATCH 4.9 02/32] wext: fix NULL-ptr-dereference with cfg80211s lack of commit() Greg Kroah-Hartman
2021-02-02 13:38 ` [PATCH 4.9 03/32] net: usb: qmi_wwan: added support for Thales Cinterion PLSx3 modem family Greg Kroah-Hartman
2021-02-02 13:38 ` [PATCH 4.9 04/32] y2038: futex: Move compat implementation into futex.c Greg Kroah-Hartman
2021-02-02 13:38 ` [PATCH 4.9 05/32] futex: Move futex exit handling into futex code Greg Kroah-Hartman
2021-02-02 13:38 ` [PATCH 4.9 06/32] futex: Replace PF_EXITPIDONE with a state Greg Kroah-Hartman
2021-02-02 13:38 ` [PATCH 4.9 07/32] exit/exec: Seperate mm_release() Greg Kroah-Hartman
2021-02-02 13:38 ` [PATCH 4.9 08/32] futex: Split futex_mm_release() for exit/exec Greg Kroah-Hartman
2021-02-02 13:38 ` Greg Kroah-Hartman [this message]
2021-02-02 13:38 ` [PATCH 4.9 10/32] futex: Mark the begin of futex exit explicitly Greg Kroah-Hartman
2021-02-02 13:38 ` [PATCH 4.9 11/32] futex: Sanitize exit state handling Greg Kroah-Hartman
2021-02-02 13:38 ` [PATCH 4.9 12/32] futex: Provide state handling for exec() as well Greg Kroah-Hartman
2021-02-02 13:38 ` [PATCH 4.9 13/32] futex: Add mutex around futex exit Greg Kroah-Hartman
2021-02-02 13:38 ` [PATCH 4.9 14/32] futex: Provide distinct return value when owner is exiting Greg Kroah-Hartman
2021-02-02 13:38 ` [PATCH 4.9 15/32] futex: Prevent exit livelock Greg Kroah-Hartman
2021-02-02 13:38 ` [PATCH 4.9 16/32] KVM: x86/pmu: Fix HW_REF_CPU_CYCLES event pseudo-encoding in intel_arch_events[] Greg Kroah-Hartman
2021-02-02 13:38 ` [PATCH 4.9 17/32] KVM: x86: get smi pending status correctly Greg Kroah-Hartman
2021-02-02 13:38 ` [PATCH 4.9 18/32] leds: trigger: fix potential deadlock with libata Greg Kroah-Hartman
2021-02-02 13:38 ` [PATCH 4.9 19/32] mt7601u: fix kernel crash unplugging the device Greg Kroah-Hartman
2021-02-02 13:38 ` [PATCH 4.9 20/32] mt7601u: fix rx buffer refcounting Greg Kroah-Hartman
2021-02-02 13:38 ` [PATCH 4.9 21/32] ARM: imx: build suspend-imx6.S with arm instruction set Greg Kroah-Hartman
2021-02-02 13:38 ` [PATCH 4.9 22/32] netfilter: nft_dynset: add timeout extension to template Greg Kroah-Hartman
2021-02-02 13:38 ` [PATCH 4.9 23/32] xfrm: Fix oops in xfrm_replay_advance_bmp Greg Kroah-Hartman
2021-02-02 13:38 ` [PATCH 4.9 24/32] RDMA/cxgb4: Fix the reported max_recv_sge value Greg Kroah-Hartman
2021-02-02 13:38 ` [PATCH 4.9 25/32] iwlwifi: pcie: use jiffies for memory read spin time limit Greg Kroah-Hartman
2021-02-02 13:38 ` [PATCH 4.9 26/32] iwlwifi: pcie: reschedule in long-running memory reads Greg Kroah-Hartman
2021-02-02 13:38 ` [PATCH 4.9 27/32] mac80211: pause TX while changing interface type Greg Kroah-Hartman
2021-02-02 13:38 ` [PATCH 4.9 28/32] can: dev: prevent potential information leak in can_fill_info() Greg Kroah-Hartman
2021-02-02 13:38 ` [PATCH 4.9 29/32] iommu/vt-d: Gracefully handle DMAR units with no supported address widths Greg Kroah-Hartman
2021-02-02 13:38 ` [PATCH 4.9 30/32] iommu/vt-d: Dont dereference iommu_device if IOMMU_API is not built Greg Kroah-Hartman
2021-02-02 13:38 ` [PATCH 4.9 31/32] NFC: fix resource leak when target index is invalid Greg Kroah-Hartman
2021-02-02 13:38 ` [PATCH 4.9 32/32] NFC: fix possible resource leak Greg Kroah-Hartman
2021-02-02 20:20 ` [PATCH 4.9 00/32] 4.9.255-rc1 review Jon Hunter
2021-02-03  9:53 ` Naresh Kamboju
2021-02-03 15:42 ` Shuah Khan
2021-02-03 20:41 ` Guenter Roeck

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