From b32e41bb97971161ad34ea69364c4f9ec3909151 Mon Sep 17 00:00:00 2001 From: Milind Arun Choudhary Date: Tue, 8 May 2007 00:30:08 -0700 Subject: SPIN_LOCK_UNLOCKED cleanup in init_task.h SPIN_LOCK_UNLOCKED cleanup,use __SPIN_LOCK_UNLOCKED instead Signed-off-by: Milind Arun Choudhary Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/linux/init_task.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'include/linux/init_task.h') diff --git a/include/linux/init_task.h b/include/linux/init_task.h index a2d95ff50e9b..795102309bf1 100644 --- a/include/linux/init_task.h +++ b/include/linux/init_task.h @@ -138,7 +138,7 @@ extern struct group_info init_groups; .journal_info = NULL, \ .cpu_timers = INIT_CPU_TIMERS(tsk.cpu_timers), \ .fs_excl = ATOMIC_INIT(0), \ - .pi_lock = SPIN_LOCK_UNLOCKED, \ + .pi_lock = __SPIN_LOCK_UNLOCKED(tsk.pi_lock), \ INIT_TRACE_IRQFLAGS \ INIT_LOCKDEP \ } -- cgit v1.2.3 From f7e4217b007d1f73e7e3cf10ba4fea4a608c603f Mon Sep 17 00:00:00 2001 From: Roman Zippel Date: Wed, 9 May 2007 02:35:17 -0700 Subject: rename thread_info to stack This finally renames the thread_info field in task structure to stack, so that the assumptions about this field are gone and archs have more freedom about placing the thread_info structure. Nonbroken archs which have a proper thread pointer can do the access to both current thread and task structure via a single pointer. It'll allow for a few more cleanups of the fork code, from which e.g. ia64 could benefit. Signed-off-by: Roman Zippel [akpm@linux-foundation.org: build fix] Cc: Richard Henderson Cc: Ivan Kokshaysky Cc: Russell King Cc: Ian Molton Cc: Haavard Skinnemoen Cc: Mikael Starvik Cc: David Howells Cc: Yoshinori Sato Cc: "Luck, Tony" Cc: Hirokazu Takata Cc: Geert Uytterhoeven Cc: Roman Zippel Cc: Greg Ungerer Cc: Ralf Baechle Cc: Ralf Baechle Cc: Paul Mackerras Cc: Benjamin Herrenschmidt Cc: Heiko Carstens Cc: Martin Schwidefsky Cc: Paul Mundt Cc: Kazumoto Kojima Cc: Richard Curnow Cc: William Lee Irwin III Cc: "David S. Miller" Cc: Jeff Dike Cc: Paolo 'Blaisorblade' Giarrusso Cc: Miles Bader Cc: Andi Kleen Cc: Chris Zankel Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/linux/init_task.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'include/linux/init_task.h') diff --git a/include/linux/init_task.h b/include/linux/init_task.h index 795102309bf1..45170b2fa253 100644 --- a/include/linux/init_task.h +++ b/include/linux/init_task.h @@ -95,7 +95,7 @@ extern struct group_info init_groups; #define INIT_TASK(tsk) \ { \ .state = 0, \ - .thread_info = &init_thread_info, \ + .stack = &init_thread_info, \ .usage = ATOMIC_INIT(2), \ .flags = 0, \ .lock_depth = -1, \ -- cgit v1.2.3 From 820e45db2380eb1545fa2bc5d34b8b2f2933faeb Mon Sep 17 00:00:00 2001 From: Sukadev Bhattiprolu Date: Thu, 10 May 2007 22:23:00 -0700 Subject: statically initialize struct pid for swapper Statically initialize a struct pid for the swapper process (pid_t == 0) and attach it to init_task. This is needed so task_pid(), task_pgrp() and task_session() interfaces work on the swapper process also. Signed-off-by: Sukadev Bhattiprolu Cc: Cedric Le Goater Cc: Dave Hansen Cc: Serge Hallyn Cc: Eric Biederman Cc: Herbert Poetzl Cc: Acked-by: Eric W. Biederman Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/linux/init_task.h | 27 +++++++++++++++++++++++++++ 1 file changed, 27 insertions(+) (limited to 'include/linux/init_task.h') diff --git a/include/linux/init_task.h b/include/linux/init_task.h index 45170b2fa253..a68835fc8c04 100644 --- a/include/linux/init_task.h +++ b/include/linux/init_task.h @@ -88,6 +88,28 @@ extern struct nsproxy init_nsproxy; extern struct group_info init_groups; +#define INIT_STRUCT_PID { \ + .count = ATOMIC_INIT(1), \ + .nr = 0, \ + /* Don't put this struct pid in pid_hash */ \ + .pid_chain = { .next = NULL, .pprev = NULL }, \ + .tasks = { \ + { .first = &init_task.pids[PIDTYPE_PID].node }, \ + { .first = &init_task.pids[PIDTYPE_PGID].node }, \ + { .first = &init_task.pids[PIDTYPE_SID].node }, \ + }, \ + .rcu = RCU_HEAD_INIT, \ +} + +#define INIT_PID_LINK(type) \ +{ \ + .node = { \ + .next = NULL, \ + .pprev = &init_struct_pid.tasks[type].first, \ + }, \ + .pid = &init_struct_pid, \ +} + /* * INIT_TASK is used to set up the first task table, touch at * your own risk!. Base=0, limit=0x1fffff (=2MB) @@ -139,6 +161,11 @@ extern struct group_info init_groups; .cpu_timers = INIT_CPU_TIMERS(tsk.cpu_timers), \ .fs_excl = ATOMIC_INIT(0), \ .pi_lock = __SPIN_LOCK_UNLOCKED(tsk.pi_lock), \ + .pids = { \ + [PIDTYPE_PID] = INIT_PID_LINK(PIDTYPE_PID), \ + [PIDTYPE_PGID] = INIT_PID_LINK(PIDTYPE_PGID), \ + [PIDTYPE_SID] = INIT_PID_LINK(PIDTYPE_SID), \ + }, \ INIT_TRACE_IRQFLAGS \ INIT_LOCKDEP \ } -- cgit v1.2.3 From 325aa33da784e5997c756a151bc46e9cc9b79db2 Mon Sep 17 00:00:00 2001 From: Sukadev Bhattiprolu Date: Thu, 10 May 2007 22:23:10 -0700 Subject: Don't init pgrp and __session in INIT_SIGNALS Remove initialization of pgrp and __session in INIT_SIGNALS, as these are later set by the call to __set_special_pids() in init/main.c by the patch: explicitly-set-pgid-and-sid-of-init-process.patch Signed-off-by: Sukadev Bhattiprolu Cc: Cedric Le Goater Cc: Dave Hansen Cc: Serge Hallyn Cc: Eric Biederman Cc: Oleg Nesterov Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/linux/init_task.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'include/linux/init_task.h') diff --git a/include/linux/init_task.h b/include/linux/init_task.h index a68835fc8c04..66e2f0a70814 100644 --- a/include/linux/init_task.h +++ b/include/linux/init_task.h @@ -65,9 +65,9 @@ .posix_timers = LIST_HEAD_INIT(sig.posix_timers), \ .cpu_timers = INIT_CPU_TIMERS(sig.cpu_timers), \ .rlim = INIT_RLIMITS, \ - .pgrp = 1, \ + .pgrp = 0, \ .tty_old_pgrp = NULL, \ - { .__session = 1}, \ + { .__session = 0}, \ } extern struct nsproxy init_nsproxy; -- cgit v1.2.3 From fba2afaaec790dc5ab4ae8827972f342211bbb86 Mon Sep 17 00:00:00 2001 From: Davide Libenzi Date: Thu, 10 May 2007 22:23:13 -0700 Subject: signal/timer/event: signalfd core This patch series implements the new signalfd() system call. I took part of the original Linus code (and you know how badly it can be broken :), and I added even more breakage ;) Signals are fetched from the same signal queue used by the process, so signalfd will compete with standard kernel delivery in dequeue_signal(). If you want to reliably fetch signals on the signalfd file, you need to block them with sigprocmask(SIG_BLOCK). This seems to be working fine on my Dual Opteron machine. I made a quick test program for it: http://www.xmailserver.org/signafd-test.c The signalfd() system call implements signal delivery into a file descriptor receiver. The signalfd file descriptor if created with the following API: int signalfd(int ufd, const sigset_t *mask, size_t masksize); The "ufd" parameter allows to change an existing signalfd sigmask, w/out going to close/create cycle (Linus idea). Use "ufd" == -1 if you want a brand new signalfd file. The "mask" allows to specify the signal mask of signals that we are interested in. The "masksize" parameter is the size of "mask". The signalfd fd supports the poll(2) and read(2) system calls. The poll(2) will return POLLIN when signals are available to be dequeued. As a direct consequence of supporting the Linux poll subsystem, the signalfd fd can use used together with epoll(2) too. The read(2) system call will return a "struct signalfd_siginfo" structure in the userspace supplied buffer. The return value is the number of bytes copied in the supplied buffer, or -1 in case of error. The read(2) call can also return 0, in case the sighand structure to which the signalfd was attached, has been orphaned. The O_NONBLOCK flag is also supported, and read(2) will return -EAGAIN in case no signal is available. If the size of the buffer passed to read(2) is lower than sizeof(struct signalfd_siginfo), -EINVAL is returned. A read from the signalfd can also return -ERESTARTSYS in case a signal hits the process. The format of the struct signalfd_siginfo is, and the valid fields depends of the (->code & __SI_MASK) value, in the same way a struct siginfo would: struct signalfd_siginfo { __u32 signo; /* si_signo */ __s32 err; /* si_errno */ __s32 code; /* si_code */ __u32 pid; /* si_pid */ __u32 uid; /* si_uid */ __s32 fd; /* si_fd */ __u32 tid; /* si_fd */ __u32 band; /* si_band */ __u32 overrun; /* si_overrun */ __u32 trapno; /* si_trapno */ __s32 status; /* si_status */ __s32 svint; /* si_int */ __u64 svptr; /* si_ptr */ __u64 utime; /* si_utime */ __u64 stime; /* si_stime */ __u64 addr; /* si_addr */ }; [akpm@linux-foundation.org: fix signalfd_copyinfo() on i386] Signed-off-by: Davide Libenzi Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/linux/init_task.h | 1 + 1 file changed, 1 insertion(+) (limited to 'include/linux/init_task.h') diff --git a/include/linux/init_task.h b/include/linux/init_task.h index 66e2f0a70814..276ccaa2670c 100644 --- a/include/linux/init_task.h +++ b/include/linux/init_task.h @@ -84,6 +84,7 @@ extern struct nsproxy init_nsproxy; .count = ATOMIC_INIT(1), \ .action = { { { .sa_handler = NULL, } }, }, \ .siglock = __SPIN_LOCK_UNLOCKED(sighand.siglock), \ + .signalfd_list = LIST_HEAD_INIT(sighand.signalfd_list), \ } extern struct group_info init_groups; -- cgit v1.2.3