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authorDavid Howells <dhowells@redhat.com>2009-09-02 09:14:16 +0100
committerJames Morris <jmorris@namei.org>2009-09-02 21:29:19 +1000
commitd0420c83f39f79afb82010c2d2cafd150eef651b (patch)
tree0aa939d78ed62bafdd6e38ca26451f8039392378 /arch/h8300
parent7b1b9164598286fe93927ff41eed2a2609fd9056 (diff)
downloadlinux-d0420c83f39f79afb82010c2d2cafd150eef651b.tar.bz2
KEYS: Extend TIF_NOTIFY_RESUME to (almost) all architectures [try #6]
Implement TIF_NOTIFY_RESUME for most of those architectures in which isn't yet available, and, whilst we're at it, have it call the appropriate tracehook. After this patch, blackfin, m68k* and xtensa still lack support and need alteration of assembly code to make it work. Resume notification can then be used (by a later patch) to install a new session keyring on the parent of a process. Signed-off-by: David Howells <dhowells@redhat.com> Acked-by: Russell King <rmk+kernel@arm.linux.org.uk> cc: linux-arch@vger.kernel.org Signed-off-by: James Morris <jmorris@namei.org>
Diffstat (limited to 'arch/h8300')
-rw-r--r--arch/h8300/include/asm/thread_info.h2
-rw-r--r--arch/h8300/kernel/signal.c5
2 files changed, 7 insertions, 0 deletions
diff --git a/arch/h8300/include/asm/thread_info.h b/arch/h8300/include/asm/thread_info.h
index 8bbc8b0ee45d..70e67e47d020 100644
--- a/arch/h8300/include/asm/thread_info.h
+++ b/arch/h8300/include/asm/thread_info.h
@@ -89,6 +89,7 @@ static inline struct thread_info *current_thread_info(void)
TIF_NEED_RESCHED */
#define TIF_MEMDIE 4
#define TIF_RESTORE_SIGMASK 5 /* restore signal mask in do_signal() */
+#define TIF_NOTIFY_RESUME 6 /* callback before returning to user */
#define TIF_FREEZE 16 /* is freezing for suspend */
/* as above, but as bit values */
@@ -97,6 +98,7 @@ static inline struct thread_info *current_thread_info(void)
#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
#define _TIF_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK)
+#define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
#define _TIF_FREEZE (1<<TIF_FREEZE)
#define _TIF_WORK_MASK 0x0000FFFE /* work to do on interrupt/exception return */
diff --git a/arch/h8300/kernel/signal.c b/arch/h8300/kernel/signal.c
index cf3472f7389b..56b3ab7dbbb0 100644
--- a/arch/h8300/kernel/signal.c
+++ b/arch/h8300/kernel/signal.c
@@ -552,4 +552,9 @@ asmlinkage void do_notify_resume(struct pt_regs *regs, u32 thread_info_flags)
{
if (thread_info_flags & (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK))
do_signal(regs, NULL);
+
+ if (thread_info_flags & _TIF_NOTIFY_RESUME) {
+ clear_thread_flag(TIF_NOTIFY_RESUME);
+ tracehook_notify_resume(regs);
+ }
}