From: Li Zhong <zhong@linux.vnet.ibm.com>
To: linux-kernel@vger.kernel.org
Cc: Li Zhong <zhong@linux.vnet.ibm.com>,
fweisbec@gmail.com, paulus@samba.org, paulmck@linux.vnet.ibm.com,
linuxppc-dev@lists.ozlabs.org
Subject: [RFC PATCH 1/5] powerpc: Syscall hooks for context tracking subsystem
Date: Fri, 1 Feb 2013 18:27:41 +0800 [thread overview]
Message-ID: <1359714465-6297-2-git-send-email-zhong@linux.vnet.ibm.com> (raw)
In-Reply-To: <1359714465-6297-1-git-send-email-zhong@linux.vnet.ibm.com>
This is the syscall slow path hooks for context tracking subsystem,
corresponding to
[PATCH] x86: Syscall hooks for userspace RCU extended QS
commit bf5a3c13b939813d28ce26c01425054c740d6731
TIF_MEMDIE is moved to the second 16-bits (with value 17), as it seems there
is no asm code using it. TIF_NOHZ is added to _TIF_SYCALL_T_OR_A, so it is
better for it to be in the same 16 bits with others in the group, so in the
asm code, andi. with this group could work.
Signed-off-by: Li Zhong <zhong@linux.vnet.ibm.com>
---
arch/powerpc/include/asm/thread_info.h | 7 +++++--
arch/powerpc/kernel/ptrace.c | 5 +++++
2 files changed, 10 insertions(+), 2 deletions(-)
diff --git a/arch/powerpc/include/asm/thread_info.h b/arch/powerpc/include/asm/thread_info.h
index 406b7b9..414a261 100644
--- a/arch/powerpc/include/asm/thread_info.h
+++ b/arch/powerpc/include/asm/thread_info.h
@@ -97,7 +97,7 @@ static inline struct thread_info *current_thread_info(void)
#define TIF_PERFMON_CTXSW 6 /* perfmon needs ctxsw calls */
#define TIF_SYSCALL_AUDIT 7 /* syscall auditing active */
#define TIF_SINGLESTEP 8 /* singlestepping active */
-#define TIF_MEMDIE 9 /* is terminating due to OOM killer */
+#define TIF_NOHZ 9 /* in adaptive nohz mode */
#define TIF_SECCOMP 10 /* secure computing */
#define TIF_RESTOREALL 11 /* Restore all regs (implies NOERROR) */
#define TIF_NOERROR 12 /* Force successful syscall return */
@@ -106,6 +106,7 @@ static inline struct thread_info *current_thread_info(void)
#define TIF_SYSCALL_TRACEPOINT 15 /* syscall tracepoint instrumentation */
#define TIF_EMULATE_STACK_STORE 16 /* Is an instruction emulation
for stack store? */
+#define TIF_MEMDIE 17 /* is terminating due to OOM killer */
/* as above, but as bit values */
#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
@@ -124,8 +125,10 @@ static inline struct thread_info *current_thread_info(void)
#define _TIF_UPROBE (1<<TIF_UPROBE)
#define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT)
#define _TIF_EMULATE_STACK_STORE (1<<TIF_EMULATE_STACK_STORE)
+#define _TIF_NOHZ (1<<TIF_NOHZ)
#define _TIF_SYSCALL_T_OR_A (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \
- _TIF_SECCOMP | _TIF_SYSCALL_TRACEPOINT)
+ _TIF_SECCOMP | _TIF_SYSCALL_TRACEPOINT | \
+ _TIF_NOHZ)
#define _TIF_USER_WORK_MASK (_TIF_SIGPENDING | _TIF_NEED_RESCHED | \
_TIF_NOTIFY_RESUME | _TIF_UPROBE)
diff --git a/arch/powerpc/kernel/ptrace.c b/arch/powerpc/kernel/ptrace.c
index c497000..62238dd 100644
--- a/arch/powerpc/kernel/ptrace.c
+++ b/arch/powerpc/kernel/ptrace.c
@@ -32,6 +32,7 @@
#include <trace/syscall.h>
#include <linux/hw_breakpoint.h>
#include <linux/perf_event.h>
+#include <linux/context_tracking.h>
#include <asm/uaccess.h>
#include <asm/page.h>
@@ -1745,6 +1746,8 @@ long do_syscall_trace_enter(struct pt_regs *regs)
{
long ret = 0;
+ user_exit();
+
secure_computing_strict(regs->gpr[0]);
if (test_thread_flag(TIF_SYSCALL_TRACE) &&
@@ -1789,4 +1792,6 @@ void do_syscall_trace_leave(struct pt_regs *regs)
step = test_thread_flag(TIF_SINGLESTEP);
if (step || test_thread_flag(TIF_SYSCALL_TRACE))
tracehook_report_syscall_exit(regs, step);
+
+ user_enter();
}
--
1.7.9.5
next prev parent reply other threads:[~2013-02-01 10:28 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-02-01 10:27 [RFC PATCH 0/5] powerpc: Support context tracking for Power pSeries Li Zhong
2013-02-01 10:27 ` Li Zhong [this message]
2013-02-07 0:29 ` [RFC PATCH 1/5] powerpc: Syscall hooks for context tracking subsystem Frederic Weisbecker
2013-02-07 8:53 ` Li Zhong
2013-02-07 16:09 ` Frederic Weisbecker
2013-02-10 10:32 ` Frederic Weisbecker
2013-02-01 10:27 ` [RFC PATCH 2/5] powerpc: Exception " Li Zhong
2013-02-10 14:10 ` Frederic Weisbecker
2013-02-16 9:41 ` Li Zhong
2013-02-01 10:27 ` [RFC PATCH 3/5] powerpc: Exit user context on notify resume Li Zhong
2013-02-01 10:27 ` [RFC PATCH 4/5] powerpc: Use the new schedule_user API on userspace preemption Li Zhong
2013-02-01 10:27 ` [RFC PATCH 5/5] powerpc: select HAVE_CONTEXT_TRACKING for pSeries Li Zhong
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