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Subject[tip: locking/core] futex: Split futex_mm_release() for exit/exec
The following commit has been merged into the locking/core branch of tip:

Commit-ID: 7d8882f1d07db08f25a8e35843a63a9caef36f20
Gitweb: https://git.kernel.org/tip/7d8882f1d07db08f25a8e35843a63a9caef36f20
Author: Thomas Gleixner <tglx@linutronix.de>
AuthorDate: Wed, 06 Nov 2019 22:55:39 +01:00
Committer: Thomas Gleixner <tglx@linutronix.de>
CommitterDate: Fri, 15 Nov 2019 19:10:51 +01:00

futex: Split futex_mm_release() for exit/exec

To allow separate handling of the futex exit state in the futex exit code
for exit and exec, split futex_mm_release() into two functions and invoke
them from the corresponding exit/exec_mm_release() callsites.

Preparatory only, no functional change.

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/20191106224556.332094221@linutronix.de

---
include/linux/futex.h | 6 ++++--
kernel/fork.c | 5 ++---
kernel/futex.c | 7 ++++++-
3 files changed, 12 insertions(+), 6 deletions(-)

diff --git a/include/linux/futex.h b/include/linux/futex.h
index 5a74bda..9762951 100644
--- a/include/linux/futex.h
+++ b/include/linux/futex.h
@@ -91,14 +91,16 @@ static inline void futex_exit_done(struct task_struct *tsk)
tsk->futex_state = FUTEX_STATE_DEAD;
}

-void futex_mm_release(struct task_struct *tsk);
+void futex_exit_release(struct task_struct *tsk);
+void futex_exec_release(struct task_struct *tsk);

long do_futex(u32 __user *uaddr, int op, u32 val, ktime_t *timeout,
u32 __user *uaddr2, u32 val2, u32 val3);
#else
static inline void futex_init_task(struct task_struct *tsk) { }
-static inline void futex_mm_release(struct task_struct *tsk) { }
static inline void futex_exit_done(struct task_struct *tsk) { }
+static inline void futex_exit_release(struct task_struct *tsk) { }
+static inline void futex_exec_release(struct task_struct *tsk) { }
static inline long do_futex(u32 __user *uaddr, int op, u32 val,
ktime_t *timeout, u32 __user *uaddr2,
u32 val2, u32 val3)
diff --git a/kernel/fork.c b/kernel/fork.c
index 096f9d8..f1eb4d1 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -1285,9 +1285,6 @@ static int wait_for_vfork_done(struct task_struct *child,
*/
static void mm_release(struct task_struct *tsk, struct mm_struct *mm)
{
- /* Get rid of any futexes when releasing the mm */
- futex_mm_release(tsk);
-
uprobe_free_utask(tsk);

/* Get rid of any cached register state */
@@ -1322,11 +1319,13 @@ static void mm_release(struct task_struct *tsk, struct mm_struct *mm)

void exit_mm_release(struct task_struct *tsk, struct mm_struct *mm)
{
+ futex_exit_release(tsk);
mm_release(tsk, mm);
}

void exec_mm_release(struct task_struct *tsk, struct mm_struct *mm)
{
+ futex_exec_release(tsk);
mm_release(tsk, mm);
}

diff --git a/kernel/futex.c b/kernel/futex.c
index 41c7527..909e4d3 100644
--- a/kernel/futex.c
+++ b/kernel/futex.c
@@ -3661,7 +3661,7 @@ static void exit_robust_list(struct task_struct *curr)
}
}

-void futex_mm_release(struct task_struct *tsk)
+void futex_exec_release(struct task_struct *tsk)
{
if (unlikely(tsk->robust_list)) {
exit_robust_list(tsk);
@@ -3679,6 +3679,11 @@ void futex_mm_release(struct task_struct *tsk)
exit_pi_state_list(tsk);
}

+void futex_exit_release(struct task_struct *tsk)
+{
+ futex_exec_release(tsk);
+}
+
long do_futex(u32 __user *uaddr, int op, u32 val, ktime_t *timeout,
u32 __user *uaddr2, u32 val2, u32 val3)
{
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