Commit 64482bd8 authored May 20, 2012 by Al Viro

parisc: decide whether to go to slow path (tracesys) based on thread flags



Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

parent e3b880c6

arch/parisc/include/asm/thread_info.h

+2 −0

Original line number	Diff line number	Diff line
		@@ -74,6 +74,8 @@ struct thread_info {

		#define _TIF_USER_WORK_MASK (_TIF_SIGPENDING \| _TIF_NOTIFY_RESUME \| \
		_TIF_NEED_RESCHED)
		#define _TIF_SYSCALL_TRACE_MASK (_TIF_SYSCALL_TRACE \| _TIF_SINGLESTEP \| \
		_TIF_BLOCKSTEP)

		#define tsk_is_polling(t) test_tsk_thread_flag(t, TIF_POLLING_NRFLAG)

arch/parisc/kernel/syscall.S

+4 −3

Original line number	Diff line number	Diff line
		@@ -180,9 +180,10 @@ linux_gateway_entry:

		/* Are we being ptraced? */
		mfctl %cr30, %r1
		LDREG TI_TASK(%r1),%r1
		ldw TASK_PTRACE(%r1), %r1
		bb,<,n %r1,31,.Ltracesys
		LDREG TI_FLAGS(%r1),%r1
		ldi _TIF_SYSCALL_TRACE_MASK, %r19
		and,COND(=) %r1, %r19, %r0
		b,n .Ltracesys

		/* Note! We cannot use the syscall table that is mapped
		nearby since the gateway page is mapped execute-only. */