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utrace update

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This commit is contained in:
Roland McGrath 2011-01-19 13:27:18 -08:00
parent 2eddc8a9bb
commit c496c71d98
5 changed files with 151 additions and 95 deletions
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7
kernel.spec
View File

@ -1984,6 +1984,9 @@ fi
# ||----w |
# || ||
%changelog
* Wed Jan 19 2011 Roland McGrath <roland@redhat.com>
- utrace update
* Tue Jan 11 2011 Matthew Garrett <mjg@redhat.com>
- linux-2.6-ehci-check-port-status.patch - fix USB resume on some AMD systems
@ -1995,10 +1998,10 @@ fi
- drm_i915-check-eDP-encoder-correctly-when-setting-modes.patch reported to
fix HP/Sony eDP issues by adamw and airlied.
* Wed Jan 05 2011 Dennis Gilmore <dennis@ausil.us>
* Wed Jan 05 2011 Dennis Gilmore <dennis@ausil.us>
- build sparc headers on sparcv9
* Tue Jan 04 2011 Dennis Gilmore <dennis@ausil.us>
* Tue Jan 04 2011 Dennis Gilmore <dennis@ausil.us>
- add patch for sparc build failure
* Tue Jan 04 2011 Kyle McMartin <kyle@redhat.com> 2.6.37-1

18
linux-2.6-tracehook.patch
View File

@ -20,10 +20,10 @@ Signed-off-by: Roland McGrath <roland@redhat.com>
5 files changed, 10 insertions(+), 8 deletions(-)
diff --git a/include/linux/ptrace.h b/include/linux/ptrace.h
index 4272521..a85fb41 100644
index 092a04f..619cdf0 100644
--- a/include/linux/ptrace.h
+++ b/include/linux/ptrace.h
@@ -105,6 +105,7 @@ extern int ptrace_traceme(void);
@@ -106,6 +106,7 @@ extern int ptrace_traceme(void);
extern int ptrace_readdata(struct task_struct *tsk, unsigned long src, char __user *dst, int len);
extern int ptrace_writedata(struct task_struct *tsk, char __user *src, unsigned long dst, int len);
extern int ptrace_attach(struct task_struct *tsk);
@ -32,10 +32,10 @@ index 4272521..a85fb41 100644
extern void ptrace_disable(struct task_struct *);
extern int ptrace_check_attach(struct task_struct *task, int kill);
diff --git a/include/linux/sched.h b/include/linux/sched.h
index ce160d6..5e7cc95 100644
index 2238745..09f26df 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -2030,6 +2030,7 @@ extern int kill_pgrp(struct pid *pid, in
@@ -2061,6 +2061,7 @@ extern int kill_pgrp(struct pid *pid, in
extern int kill_pid(struct pid *pid, int sig, int priv);
extern int kill_proc_info(int, struct siginfo *, pid_t);
extern int do_notify_parent(struct task_struct *, int);
@ -44,7 +44,7 @@ index ce160d6..5e7cc95 100644
extern void force_sig(int, struct task_struct *);
extern int send_sig(int, struct task_struct *, int);
diff --git a/include/linux/tracehook.h b/include/linux/tracehook.h
index 10db010..c78b2f4 100644
index 3a2e66d..98917e9 100644
--- a/include/linux/tracehook.h
+++ b/include/linux/tracehook.h
@@ -134,7 +134,7 @@ static inline __must_check int tracehook
@ -93,7 +93,7 @@ index 10db010..c78b2f4 100644
/**
diff --git a/kernel/ptrace.c b/kernel/ptrace.c
index f34d798..8049cb5 100644
index 99bbaa3..84d9f8f 100644
--- a/kernel/ptrace.c
+++ b/kernel/ptrace.c
@@ -270,7 +270,7 @@ static int ignoring_children(struct sigh
@ -106,10 +106,10 @@ index f34d798..8049cb5 100644
__ptrace_unlink(p);
diff --git a/kernel/signal.c b/kernel/signal.c
index bded651..6d13d9f 100644
index 4e3cff1..b74324d 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -1521,7 +1521,7 @@ int do_notify_parent(struct task_struct
@@ -1522,7 +1522,7 @@ int do_notify_parent(struct task_struct
return ret;
}
@ -118,7 +118,7 @@ index bded651..6d13d9f 100644
{
struct siginfo info;
unsigned long flags;
@@ -1791,7 +1791,7 @@ static int do_signal_stop(int signr)
@@ -1794,7 +1794,7 @@ static int do_signal_stop(int signr)
static int ptrace_signal(int signr, siginfo_t *info,
struct pt_regs *regs, void *cookie)
{

165
linux-2.6-utrace-ptrace.patch
View File

@ -12,28 +12,27 @@ change to userland when CONFIG_UTRACE is enabled.
Signed-off-by: Roland McGrath <roland@redhat.com>
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
---
include/linux/ptrace.h | 2 +-
include/linux/ptrace.h | 1 +
kernel/Makefile | 1 +
kernel/ptrace-utrace.c | 1138 ++++++++++++++++++++++++++++++++++++++++++++++++
kernel/ptrace.c | 688 ++++++++++++++---------------
kernel/ptrace-utrace.c | 1187 ++++++++++++++++++++++++++++++++++++++++++++++++
kernel/ptrace.c | 690 ++++++++++++++--------------
kernel/utrace.c | 16 +
5 files changed, 1494 insertions(+), 351 deletions(-)
5 files changed, 1544 insertions(+), 351 deletions(-)
diff --git a/include/linux/ptrace.h b/include/linux/ptrace.h
index a85fb41..235c1b0 100644
index 619cdf0..e391bdb 100644
--- a/include/linux/ptrace.h
+++ b/include/linux/ptrace.h
@@ -99,7 +99,7 @@
#include <linux/compiler.h> /* For unlikely. */
@@ -100,6 +100,7 @@
#include <linux/sched.h> /* For struct task_struct. */
-
+extern void ptrace_notify_stop(struct task_struct *tracee);
extern long arch_ptrace(struct task_struct *child, long request,
unsigned long addr, unsigned long data);
extern int ptrace_traceme(void);
diff --git a/kernel/Makefile b/kernel/Makefile
index 6004913..b09c9a5 100644
index 1172528..9a815a5 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -71,6 +71,7 @@ obj-$(CONFIG_RESOURCE_COUNTERS) += res_c
@ -46,10 +45,10 @@ index 6004913..b09c9a5 100644
obj-$(CONFIG_AUDIT_WATCH) += audit_watch.o
diff --git a/kernel/ptrace-utrace.c b/kernel/ptrace-utrace.c
new file mode 100644
index ...a90078d 100644
index ...a5bcb9e 100644
--- /dev/null
+++ b/kernel/ptrace-utrace.c
@@ -0,0 +1,1138 @@
@@ -0,0 +1,1187 @@
+/*
+ * linux/kernel/ptrace.c
+ *
@ -119,6 +118,7 @@ index ...a90078d 100644
+#define PT_UTRACED 0x00001000
+
+#define PTRACE_O_SYSEMU 0x100
+#define PTRACE_O_DETACHED 0x200
+
+#define PTRACE_EVENT_SYSCALL (1 << 16)
+#define PTRACE_EVENT_SIGTRAP (2 << 16)
@ -155,6 +155,19 @@ index ...a90078d 100644
+ &ptrace_utrace_ops, NULL);
+}
+
+static int utrace_barrier_uninterruptible(struct task_struct *target,
+ struct utrace_engine *engine)
+{
+ for (;;) {
+ int err = utrace_barrier(target, engine);
+
+ if (err != -ERESTARTSYS)
+ return err;
+
+ schedule_timeout_uninterruptible(1);
+ }
+}
+
+static struct utrace_engine *
+ptrace_reuse_engine(struct task_struct *tracee)
+{
@ -167,7 +180,7 @@ index ...a90078d 100644
+ return engine;
+
+ ctx = ptrace_context(engine);
+ if (unlikely(ctx->resume == UTRACE_DETACH)) {
+ if (unlikely(ctx->options == PTRACE_O_DETACHED)) {
+ /*
+ * Try to reuse this self-detaching engine.
+ * The only caller which can hit this case is ptrace_attach(),
@ -181,12 +194,16 @@ index ...a90078d 100644
+ if (!err || err == -EINPROGRESS) {
+ ctx->resume = UTRACE_RESUME;
+ /* synchronize with ptrace_report_signal() */
+ err = utrace_barrier(tracee, engine);
+ err = utrace_barrier_uninterruptible(tracee, engine);
+ }
+ WARN_ON(!err != (engine->ops == &ptrace_utrace_ops));
+
+ if (!err)
+ if (!err) {
+ WARN_ON(engine->ops != &ptrace_utrace_ops &&
+ !tracee->exit_state);
+ return engine;
+ }
+
+ WARN_ON(engine->ops == &ptrace_utrace_ops);
+ }
+
+ utrace_engine_put(engine);
@ -296,32 +313,60 @@ index ...a90078d 100644
+ * If true, the caller is PTRACE_DETACH, otherwise
+ * the tracer detaches implicitly during exit.
+ */
+ bool voluntary = (sig >= 0);
+ bool explicit = (sig >= 0);
+ struct utrace_engine *engine = ptrace_lookup_engine(tracee);
+ enum utrace_resume_action action = UTRACE_DETACH;
+ struct ptrace_context *ctx;
+
+ if (unlikely(IS_ERR(engine)))
+ return;
+
+ if (sig) {
+ struct ptrace_context *ctx = ptrace_context(engine);
+ ctx = ptrace_context(engine);
+
+ if (!explicit) {
+ int err;
+
+ /*
+ * We are going to detach, the tracee can be running.
+ * Ensure ptrace_report_signal() won't report a signal.
+ */
+ ctx->resume = UTRACE_DETACH;
+ err = utrace_barrier_uninterruptible(tracee, engine);
+
+ if (!err && ctx->siginfo) {
+ /*
+ * The tracee has already reported a signal
+ * before utrace_barrier().
+ *
+ * Resume it like we do in PTRACE_EVENT_SIGNAL
+ * case below. The difference is that we can race
+ * with ptrace_report_signal() if the tracee is
+ * running but this doesn't matter. In any case
+ * UTRACE_SIGNAL_REPORT must be pending and it
+ * can return nothing but UTRACE_DETACH.
+ */
+ action = UTRACE_RESUME;
+ }
+
+ } else if (sig) {
+ switch (get_stop_event(ctx)) {
+ case PTRACE_EVENT_SYSCALL:
+ if (voluntary)
+ send_sig_info(sig, SEND_SIG_PRIV, tracee);
+ send_sig_info(sig, SEND_SIG_PRIV, tracee);
+ break;
+
+ case PTRACE_EVENT_SIGNAL:
+ if (voluntary)
+ ctx->signr = sig;
+ ctx->signr = sig;
+ ctx->resume = UTRACE_DETACH;
+ action = UTRACE_RESUME;
+ break;
+ }
+ }
+
+ ptrace_wake_up(tracee, engine, action, voluntary);
+ ptrace_wake_up(tracee, engine, action, explicit);
+
+ if (action != UTRACE_DETACH)
+ ctx->options = PTRACE_O_DETACHED;
+
+ utrace_engine_put(engine);
+}
+
@ -453,6 +498,11 @@ index ...a90078d 100644
+ return UTRACE_SYSCALL_RUN | UTRACE_STOP;
+}
+
+static inline bool is_step_resume(enum utrace_resume_action resume)
+{
+ return resume == UTRACE_BLOCKSTEP || resume == UTRACE_SINGLESTEP;
+}
+
+static u32 ptrace_report_syscall_exit(u32 action, struct utrace_engine *engine,
+ struct pt_regs *regs)
+{
@ -461,11 +511,7 @@ index ...a90078d 100644
+ if (ptrace_event_pending(ctx))
+ return UTRACE_STOP;
+
+ if (ctx->resume != UTRACE_RESUME) {
+ WARN_ON(ctx->resume != UTRACE_BLOCKSTEP &&
+ ctx->resume != UTRACE_SINGLESTEP);
+ ctx->resume = UTRACE_RESUME;
+
+ if (is_step_resume(ctx->resume)) {
+ ctx->signr = SIGTRAP;
+ return UTRACE_INTERRUPT;
+ }
@ -553,10 +599,7 @@ index ...a90078d 100644
+ if (WARN_ON(ctx->siginfo))
+ ctx->siginfo = NULL;
+
+ if (resume != UTRACE_RESUME) {
+ WARN_ON(resume != UTRACE_BLOCKSTEP &&
+ resume != UTRACE_SINGLESTEP);
+
+ if (is_step_resume(resume)) {
+ set_stop_code(ctx, PTRACE_EVENT_SIGTRAP);
+ return UTRACE_STOP | UTRACE_SIGNAL_IGN;
+ }
@ -583,6 +626,11 @@ index ...a90078d 100644
+ }
+
+ WARN_ON(ctx->siginfo);
+
+ /* Raced with the exiting tracer ? */
+ if (resume == UTRACE_DETACH)
+ return action;
+
+ ctx->siginfo = info;
+ /*
+ * ctx->siginfo points to the caller's stack.
@ -811,7 +859,7 @@ index ...a90078d 100644
+static int ptrace_set_options(struct task_struct *tracee,
+ struct utrace_engine *engine, long data)
+{
+ BUILD_BUG_ON(PTRACE_O_MASK & PTRACE_O_SYSEMU);
+ BUILD_BUG_ON(PTRACE_O_MASK & (PTRACE_O_SYSEMU | PTRACE_O_DETACHED));
+
+ ptrace_set_events(tracee, engine, data & PTRACE_O_MASK);
+ return (data & ~PTRACE_O_MASK) ? -EINVAL : 0;
@ -1189,7 +1237,7 @@ index ...a90078d 100644
+}
+#endif /* CONFIG_COMPAT */
diff --git a/kernel/ptrace.c b/kernel/ptrace.c
index 23bde94..daed9e8 100644
index e275608..72ea65c 100644
--- a/kernel/ptrace.c
+++ b/kernel/ptrace.c
@@ -15,7 +15,6 @@
@ -1200,7 +1248,7 @@ index 23bde94..daed9e8 100644
#include <linux/security.h>
#include <linux/signal.h>
#include <linux/audit.h>
@@ -24,7 +23,317 @@
@@ -24,7 +23,320 @@
#include <linux/uaccess.h>
#include <linux/regset.h>
@ -1412,7 +1460,8 @@ index 23bde94..daed9e8 100644
+#define arch_ptrace_attach(child) do { } while (0)
+#endif
+
+SYSCALL_DEFINE4(ptrace, long, request, long, pid, unsigned long, addr, unsigned long, data)
+SYSCALL_DEFINE4(ptrace, long, request, long, pid, unsigned long, addr,
+ unsigned long, data)
+{
+ struct task_struct *child;
+ long ret;
@ -1423,13 +1472,13 @@ index 23bde94..daed9e8 100644
+ arch_ptrace_attach(current);
+ goto out;
+ }
+
+ child = ptrace_get_task_struct(pid);
+ if (IS_ERR(child)) {
+ ret = PTR_ERR(child);
+ goto out;
+ }
+
+ if (request == PTRACE_ATTACH) {
+ ret = ptrace_attach(child);
+ /*
@ -1453,7 +1502,8 @@ index 23bde94..daed9e8 100644
+ return ret;
+}
+
+int generic_ptrace_peekdata(struct task_struct *tsk, unsigned long addr, unsigned long data)
+int generic_ptrace_peekdata(struct task_struct *tsk, unsigned long addr,
+ unsigned long data)
+{
+ unsigned long tmp;
+ int copied;
@ -1464,7 +1514,8 @@ index 23bde94..daed9e8 100644
+ return put_user(tmp, (unsigned long __user *)data);
+}
+
+int generic_ptrace_pokedata(struct task_struct *tsk, unsigned long addr, unsigned long data)
+int generic_ptrace_pokedata(struct task_struct *tsk, unsigned long addr,
+ unsigned long data)
+{
+ int copied;
+
@ -1518,7 +1569,7 @@ index 23bde94..daed9e8 100644
/*
* ptrace a task: make the debugger its new parent and
* move it to the ptrace list.
@@ -117,61 +426,6 @@ int ptrace_check_attach(struct task_stru
@@ -117,61 +429,6 @@ int ptrace_check_attach(struct task_stru
return ret;
}
@ -1580,7 +1631,7 @@ index 23bde94..daed9e8 100644
int ptrace_attach(struct task_struct *task)
{
int retval;
@@ -195,8 +449,6 @@ int ptrace_attach(struct task_struct *ta
@@ -195,8 +452,6 @@ int ptrace_attach(struct task_struct *ta
task_lock(task);
retval = __ptrace_may_access(task, PTRACE_MODE_ATTACH);
@ -1589,13 +1640,10 @@ index 23bde94..daed9e8 100644
task_unlock(task);
if (retval)
goto unlock_creds;
@@ -217,94 +469,40 @@ int ptrace_attach(struct task_struct *ta
retval = 0;
unlock_tasklist:
- write_unlock_irq(&tasklist_lock);
-unlock_creds:
- mutex_unlock(&task->signal->cred_guard_mutex);
@@ -220,91 +475,37 @@ unlock_tasklist:
write_unlock_irq(&tasklist_lock);
unlock_creds:
mutex_unlock(&task->signal->cred_guard_mutex);
-out:
- return retval;
-}
@ -1654,9 +1702,6 @@ index 23bde94..daed9e8 100644
- * If it's a zombie, our attachedness prevented normal parent notification
- * or self-reaping. Do notification now if it would have happened earlier.
- * If it should reap itself, return true.
+ write_unlock_irq(&tasklist_lock);
+unlock_creds:
+ mutex_unlock(&task->signal->cred_guard_mutex);
+out:
+ return retval;
+}
@ -1711,7 +1756,7 @@ index 23bde94..daed9e8 100644
}
int ptrace_detach(struct task_struct *child, unsigned int data)
@@ -366,56 +564,6 @@ void exit_ptrace(struct task_struct *tra
@@ -368,57 +569,7 @@ void exit_ptrace(struct task_struct *tra
write_lock_irq(&tasklist_lock);
}
@ -1765,10 +1810,12 @@ index 23bde94..daed9e8 100644
- return copied;
-}
-
static int ptrace_setoptions(struct task_struct *child, unsigned long data)
-static int ptrace_setoptions(struct task_struct *child, unsigned long data)
+static int ptrace_setoptions(struct task_struct *child, long data)
{
child->ptrace &= ~PT_TRACE_MASK;
@@ -530,47 +677,6 @@ static int ptrace_resume(struct task_str
@@ -533,47 +683,6 @@ static int ptrace_resume(struct task_str
return 0;
}
@ -1816,7 +1863,7 @@ index 23bde94..daed9e8 100644
int ptrace_request(struct task_struct *child, long request,
unsigned long addr, unsigned long data)
{
@@ -686,91 +792,7 @@ int ptrace_request(struct task_struct *c
@@ -689,91 +798,7 @@ int ptrace_request(struct task_struct *c
return ret;
}
@ -1908,7 +1955,7 @@ index 23bde94..daed9e8 100644
int compat_ptrace_request(struct task_struct *child, compat_long_t request,
compat_ulong_t addr, compat_ulong_t data)
{
@@ -845,42 +870,5 @@ int compat_ptrace_request(struct task_st
@@ -851,42 +876,5 @@ int compat_ptrace_request(struct task_st
return ret;
}
@ -1953,10 +2000,10 @@ index 23bde94..daed9e8 100644
#endif /* CONFIG_COMPAT */
+#endif /* CONFIG_UTRACE */
diff --git a/kernel/utrace.c b/kernel/utrace.c
index 43f38b7..fd21b7b 100644
index 26d6faf..37dce16 100644
--- a/kernel/utrace.c
+++ b/kernel/utrace.c
@@ -809,6 +809,22 @@ relock:
@@ -816,6 +816,22 @@ relock:
spin_unlock_irq(&task->sighand->siglock);
spin_unlock(&utrace->lock);

54
linux-2.6-utrace.patch
View File

@ -35,11 +35,11 @@ Signed-off-by: Roland McGrath <roland@redhat.com>
kernel/Makefile | 1 +
kernel/fork.c | 3 +
kernel/ptrace.c | 14 +
kernel/utrace.c | 2434 +++++++++++++++++++++++++++++++++++++
11 files changed, 3837 insertions(+), 2 deletions(-)
kernel/utrace.c | 2440 +++++++++++++++++++++++++++++++++++++
11 files changed, 3843 insertions(+), 2 deletions(-)
diff --git a/Documentation/DocBook/Makefile b/Documentation/DocBook/Makefile
index 34929f2..884c36b 100644
index 8b6e00a..2740633 100644
--- a/Documentation/DocBook/Makefile
+++ b/Documentation/DocBook/Makefile
@@ -14,7 +14,7 @@ DOCBOOKS := z8530book.xml mcabook.xml de
@ -668,10 +668,10 @@ index fff6572..a67bd83 100644
if (p->files)
fdt = files_fdtable(p->files);
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 5e7cc95..66a1ec8 100644
index 09f26df..e6fa5e9 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1339,6 +1339,11 @@ struct task_struct {
@@ -1357,6 +1357,11 @@ struct task_struct {
#endif
seccomp_t seccomp;
@ -684,7 +684,7 @@ index 5e7cc95..66a1ec8 100644
u32 parent_exec_id;
u32 self_exec_id;
diff --git a/include/linux/tracehook.h b/include/linux/tracehook.h
index c78b2f4..71fa250 100644
index 98917e9..afba8f8 100644
--- a/include/linux/tracehook.h
+++ b/include/linux/tracehook.h
@@ -49,6 +49,7 @@
@ -1620,10 +1620,10 @@ index ...f251efe 100644
+
+#endif /* linux/utrace.h */
diff --git a/init/Kconfig b/init/Kconfig
index 2de5b1c..a283086 100644
index c972899..17483b7 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -332,6 +332,15 @@ config AUDIT_TREE
@@ -339,6 +339,15 @@ config AUDIT_TREE
depends on AUDITSYSCALL
select FSNOTIFY
@ -1640,7 +1640,7 @@ index 2de5b1c..a283086 100644
menu "RCU Subsystem"
diff --git a/kernel/Makefile b/kernel/Makefile
index 0b72d1a..6004913 100644
index 0b5ff08..1172528 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -70,6 +70,7 @@ obj-$(CONFIG_IKCONFIG) += configs.o
@ -1652,10 +1652,10 @@ index 0b72d1a..6004913 100644
obj-$(CONFIG_AUDITSYSCALL) += auditsc.o
obj-$(CONFIG_AUDIT_WATCH) += audit_watch.o
diff --git a/kernel/fork.c b/kernel/fork.c
index 98b4508..3ceff6f 100644
index 5447dc7..10a39fe 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -161,6 +161,7 @@ void free_task(struct task_struct *tsk)
@@ -162,6 +162,7 @@ void free_task(struct task_struct *tsk)
free_thread_info(tsk->stack);
rt_mutex_debug_task_free(tsk);
ftrace_graph_exit_task(tsk);
@ -1663,7 +1663,7 @@ index 98b4508..3ceff6f 100644
free_task_struct(tsk);
}
EXPORT_SYMBOL(free_task);
@@ -1008,6 +1009,8 @@ static struct task_struct *copy_process(
@@ -1018,6 +1019,8 @@ static struct task_struct *copy_process(
if (!p)
goto fork_out;
@ -1673,7 +1673,7 @@ index 98b4508..3ceff6f 100644
rt_mutex_init_task(p);
diff --git a/kernel/ptrace.c b/kernel/ptrace.c
index 8049cb5..23bde94 100644
index 84d9f8f..e275608 100644
--- a/kernel/ptrace.c
+++ b/kernel/ptrace.c
@@ -15,6 +15,7 @@
@ -1720,10 +1720,10 @@ index 8049cb5..23bde94 100644
if (!current->ptrace) {
diff --git a/kernel/utrace.c b/kernel/utrace.c
new file mode 100644
index ...43f38b7 100644
index ...26d6faf 100644
--- /dev/null
+++ b/kernel/utrace.c
@@ -0,0 +1,2434 @@
@@ -0,0 +1,2440 @@
+/*
+ * utrace infrastructure interface for debugging user processes
+ *
@ -2440,8 +2440,15 @@ index ...43f38b7 100644
+ /*
+ * If no more engines want it stopped, wake it up.
+ */
+ if (task_is_traced(task) && !(flags & ENGINE_STOP))
+ if (task_is_traced(task) && !(flags & ENGINE_STOP)) {
+ /*
+ * It just resumes, so make sure single-step
+ * is not left set.
+ */
+ if (utrace->resume == UTRACE_RESUME)
+ user_disable_single_step(task);
+ utrace_wakeup(task, utrace);
+ }
+
+ /*
+ * In theory spin_lock() doesn't imply rcu_read_lock().
@ -2865,14 +2872,7 @@ index ...43f38b7 100644
+ break;
+
+ case UTRACE_RESUME:
+ /*
+ * This and all other cases imply resuming if stopped.
+ * There might not be another report before it just
+ * resumes, so make sure single-step is not left set.
+ */
+ clear_engine_wants_stop(engine);
+ if (likely(reset))
+ user_disable_single_step(target);
+ break;
+
+ case UTRACE_BLOCKSTEP:
@ -3238,6 +3238,12 @@ index ...43f38b7 100644
+ engine, event)))
+ return NULL;
+
+ if (!event) {
+ /* We only got here to report QUIESCE */
+ report->spurious = false;
+ return NULL;
+ }
+
+ /*
+ * finish_callback() reset utrace->reporting after the
+ * quiesce callback. Now we set it again (as above)
@ -3253,7 +3259,7 @@ index ...43f38b7 100644
+ if (want & ENGINE_STOP)
+ report->action = UTRACE_STOP;
+
+ if (want & (event ?: UTRACE_EVENT(QUIESCE))) {
+ if (want & event) {
+ report->spurious = false;
+ return ops;
+ }

2
scripts/pull-upstreams.sh
View File

@ -1,6 +1,6 @@
#!/bin/bash
utrace_base=2.6-current
utrace_base=2.6.37
url=http://people.redhat.com/roland/utrace/${1:-$utrace_base}