From 8f17d3a5049d32392b79925c73a0cf99ce6d5af0 Mon Sep 17 00:00:00 2001 From: Ingo Molnar Date: Mon, 27 Mar 2006 01:16:27 -0800 Subject: [PATCH] lightweight robust futexes updates - fix: initialize the robust list(s) to NULL in copy_process. - doc update - cleanup: rename _inuser to _inatomic - __user cleanups and other small cleanups Signed-off-by: Ingo Molnar Cc: Thomas Gleixner Cc: Arjan van de Ven Cc: Ulrich Drepper Cc: Andi Kleen Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- kernel/futex.c | 20 +++++++++----------- 1 file changed, 9 insertions(+), 11 deletions(-) (limited to 'kernel/futex.c') diff --git a/kernel/futex.c b/kernel/futex.c index feb724b2554..9c9b2b6b22d 100644 --- a/kernel/futex.c +++ b/kernel/futex.c @@ -913,15 +913,15 @@ err_unlock: * Process a futex-list entry, check whether it's owned by the * dying task, and do notification if so: */ -int handle_futex_death(unsigned int *uaddr, struct task_struct *curr) +int handle_futex_death(u32 __user *uaddr, struct task_struct *curr) { - unsigned int futex_val; + u32 uval; -repeat: - if (get_user(futex_val, uaddr)) +retry: + if (get_user(uval, uaddr)) return -1; - if ((futex_val & FUTEX_TID_MASK) == curr->pid) { + if ((uval & FUTEX_TID_MASK) == curr->pid) { /* * Ok, this dying thread is truly holding a futex * of interest. Set the OWNER_DIED bit atomically @@ -932,12 +932,11 @@ repeat: * thread-death.) The rest of the cleanup is done in * userspace. */ - if (futex_atomic_cmpxchg_inuser(uaddr, futex_val, - futex_val | FUTEX_OWNER_DIED) != - futex_val) - goto repeat; + if (futex_atomic_cmpxchg_inatomic(uaddr, uval, + uval | FUTEX_OWNER_DIED) != uval) + goto retry; - if (futex_val & FUTEX_WAITERS) + if (uval & FUTEX_WAITERS) futex_wake((unsigned long)uaddr, 1); } return 0; @@ -985,7 +984,6 @@ void exit_robust_list(struct task_struct *curr) if (handle_futex_death((void *)entry + futex_offset, curr)) return; - /* * Fetch the next entry in the list: */ -- cgit v1.2.3