The patch titled
tracehook: force signal_pending()
has been removed from the -mm tree. Its filename was
tracehook-force-signal_pending.patch
This patch was dropped because it was merged into mainline or a subsystem tree
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: tracehook: force signal_pending()
From: Roland McGrath <roland@xxxxxxxxxx>
This defines a new hook tracehook_force_sigpending() that lets tracing
code decide to force TIF_SIGPENDING on in recalc_sigpending().
This is not used yet, so it compiles away to nothing for now. It lays the
groundwork for new tracing code that can interrupt a task synthetically
without actually sending a signal.
Signed-off-by: Roland McGrath <roland@xxxxxxxxxx>
Cc: Oleg Nesterov <oleg@xxxxxxxxxx>
Reviewed-by: Ingo Molnar <mingo@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/tracehook.h | 14 ++++++++++++++
kernel/signal.c | 4 +++-
2 files changed, 17 insertions(+), 1 deletion(-)
diff -puN include/linux/tracehook.h~tracehook-force-signal_pending include/linux/tracehook.h
--- a/include/linux/tracehook.h~tracehook-force-signal_pending
+++ a/include/linux/tracehook.h
@@ -423,6 +423,20 @@ static inline int tracehook_consider_fat
}
/**
+ * tracehook_force_sigpending - let tracing force signal_pending(current) on
+ *
+ * Called when recomputing our signal_pending() flag. Return nonzero
+ * to force the signal_pending() flag on, so that tracehook_get_signal()
+ * will be called before the next return to user mode.
+ *
+ * Called with @current->sighand->siglock held.
+ */
+static inline int tracehook_force_sigpending(void)
+{
+ return 0;
+}
+
+/**
* tracehook_get_signal - deliver synthetic signal to traced task
* @task: @current
* @regs: task_pt_regs(@current)
diff -puN kernel/signal.c~tracehook-force-signal_pending kernel/signal.c
--- a/kernel/signal.c~tracehook-force-signal_pending
+++ a/kernel/signal.c
@@ -134,7 +134,9 @@ void recalc_sigpending_and_wake(struct t
void recalc_sigpending(void)
{
- if (!recalc_sigpending_tsk(current) && !freezing(current))
+ if (unlikely(tracehook_force_sigpending()))
+ set_thread_flag(TIF_SIGPENDING);
+ else if (!recalc_sigpending_tsk(current) && !freezing(current))
clear_thread_flag(TIF_SIGPENDING);
}
_
Patches currently in -mm which might be from roland@xxxxxxxxxx are
origin.patch
tracehook-syscall.patch
tracehook-config_have_arch_tracehook.patch
x86-tracehook_signal_handler.patch
x86-tracehook-syscall.patch
x86-tracehook-asm-syscallh.patch
x86-signals-use-asm-syscallh.patch
x86-tracehook-tif_notify_resume.patch
x86-tracehook-config_have_arch_tracehook.patch
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