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| author | David Howells <dhowells@redhat.com> | 2009-09-02 09:14:16 +0100 |
|---|---|---|
| committer | James Morris <jmorris@namei.org> | 2009-09-02 21:29:19 +1000 |
| commit | d0420c83f39f79afb82010c2d2cafd150eef651b (patch) | |
| tree | 0aa939d78ed62bafdd6e38ca26451f8039392378 /arch/alpha | |
| parent | 7b1b9164598286fe93927ff41eed2a2609fd9056 (diff) | |
| download | linux-d0420c83f39f79afb82010c2d2cafd150eef651b.tar.gz linux-d0420c83f39f79afb82010c2d2cafd150eef651b.tar.xz | |
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/alpha')
| -rw-r--r-- | arch/alpha/include/asm/thread_info.h | 5 | ||||
| -rw-r--r-- | arch/alpha/kernel/signal.c | 5 |
2 files changed, 9 insertions, 1 deletions
diff --git a/arch/alpha/include/asm/thread_info.h b/arch/alpha/include/asm/thread_info.h index 60c83abfde70..5076a8860b18 100644 --- a/arch/alpha/include/asm/thread_info.h +++ b/arch/alpha/include/asm/thread_info.h @@ -75,6 +75,7 @@ register struct thread_info *__current_thread_info __asm__("$8"); #define TIF_UAC_SIGBUS 7 #define TIF_MEMDIE 8 #define TIF_RESTORE_SIGMASK 9 /* restore signal mask in do_signal */ +#define TIF_NOTIFY_RESUME 10 /* callback before returning to user */ #define TIF_FREEZE 16 /* is freezing for suspend */ #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) @@ -82,10 +83,12 @@ register struct thread_info *__current_thread_info __asm__("$8"); #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) /* Work to do on interrupt/exception return. */ -#define _TIF_WORK_MASK (_TIF_SIGPENDING | _TIF_NEED_RESCHED) +#define _TIF_WORK_MASK (_TIF_SIGPENDING | _TIF_NEED_RESCHED | \ + _TIF_NOTIFY_RESUME) /* Work to do on any return to userspace. */ #define _TIF_ALLWORK_MASK (_TIF_WORK_MASK \ diff --git a/arch/alpha/kernel/signal.c b/arch/alpha/kernel/signal.c index df65eaa84c4c..04e17c1f0f1b 100644 --- a/arch/alpha/kernel/signal.c +++ b/arch/alpha/kernel/signal.c @@ -683,4 +683,9 @@ do_notify_resume(struct pt_regs *regs, struct switch_stack *sw, { if (thread_info_flags & (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK)) do_signal(regs, sw, r0, r19); + + if (thread_info_flags & _TIF_NOTIFY_RESUME) { + clear_thread_flag(TIF_NOTIFY_RESUME); + tracehook_notify_resume(regs); + } } |