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List:       user-mode-linux-devel
Subject:    [uml-devel] [PATCH 2/5] UML: Enable CONFIG_TRACE_IRQFLAGS_SUPPORT
From:       Paul Menage <menage () google ! com>
Date:       2009-06-16 0:17:34
Message-ID: 20090616001734.30398.74530.stgit () menage ! mtv ! corp ! google ! com
[Download RAW message or body]

UML: Enable CONFIG_TRACE_IRQFLAGS_SUPPORT

Signed-off-by: Paul Menage <menage@google.com>

---

 arch/um/Kconfig.common        |    2 +-
 arch/um/include/asm/system.h  |   39 ++++++++++++++++++++++-----------------
 arch/um/kernel/irq.c          |    1 +
 arch/um/kernel/process.c      |    1 -
 arch/um/kernel/skas/process.c |    2 +-
 5 files changed, 25 insertions(+), 20 deletions(-)

diff --git a/arch/um/Kconfig.common b/arch/um/Kconfig.common
index 0d207e7..8a54ae4 100644
--- a/arch/um/Kconfig.common
+++ b/arch/um/Kconfig.common
@@ -36,7 +36,7 @@ config PCMCIA
 # Yet to do!
 config TRACE_IRQFLAGS_SUPPORT
 	bool
-	default n
+	default y
 
 config LOCKDEP_SUPPORT
 	bool
diff --git a/arch/um/include/asm/system.h b/arch/um/include/asm/system.h
index 753346e..dd76c29 100644
--- a/arch/um/include/asm/system.h
+++ b/arch/um/include/asm/system.h
@@ -11,23 +11,28 @@ extern int get_signals(void);
 extern void block_signals(void);
 extern void unblock_signals(void);
 
-#define local_save_flags(flags) do { typecheck(unsigned long, flags); \
-				     (flags) = get_signals(); } while(0)
-#define local_irq_restore(flags) do { typecheck(unsigned long, flags); \
-				      set_signals(flags); } while(0)
-
-#define local_irq_save(flags) do { local_save_flags(flags); \
-                                   local_irq_disable(); } while(0)
-
-#define local_irq_enable() unblock_signals()
-#define local_irq_disable() block_signals()
-
-#define irqs_disabled()                 \
-({                                      \
-        unsigned long flags;            \
-        local_save_flags(flags);        \
-        (flags == 0);                   \
-})
+#define raw_local_save_flags(flags) do { typecheck(unsigned long, flags); \
+					 (flags) = get_signals(); } while (0)
+#define raw_local_irq_restore(flags) do { typecheck(unsigned long, flags); \
+					  set_signals(flags); } while (0)
+
+#define raw_local_irq_save(flags) do { raw_local_save_flags(flags); \
+				       raw_local_irq_disable(); } while (0)
+
+#define raw_local_irq_enable() unblock_signals()
+#define raw_local_irq_disable() block_signals()
+
+static inline int raw_irqs_disabled_flags(unsigned long flags)
+{
+	return (flags == 0);
+}
+
+static inline int raw_irqs_disabled(void)
+{
+	unsigned long flags;
+	raw_local_save_flags(flags);
+	return raw_irqs_disabled_flags(flags);
+}
 
 extern void *_switch_to(void *prev, void *next, void *last);
 #define switch_to(prev, next, last) prev = _switch_to(prev, next, last)
diff --git a/arch/um/kernel/irq.c b/arch/um/kernel/irq.c
index 454cdb4..f7374a2 100644
--- a/arch/um/kernel/irq.c
+++ b/arch/um/kernel/irq.c
@@ -80,6 +80,7 @@ void sigio_handler(int sig, struct uml_pt_regs *regs)
 	if (smp_sigio_handler())
 		return;
 
+	trace_hardirqs_off();
 	while (1) {
 		n = os_waiting_for_events(active_fds);
 		if (n <= 0) {
diff --git a/arch/um/kernel/process.c b/arch/um/kernel/process.c
index 4a28a15..c55debf 100644
--- a/arch/um/kernel/process.c
+++ b/arch/um/kernel/process.c
@@ -450,4 +450,3 @@ int elf_core_copy_fpregs(struct task_struct *t, elf_fpregset_t *fpu)
 
 	return save_fp_registers(userspace_pid[cpu], (unsigned long *) fpu);
 }
-
diff --git a/arch/um/kernel/skas/process.c b/arch/um/kernel/skas/process.c
index 2e9852c..4a21c5c 100644
--- a/arch/um/kernel/skas/process.c
+++ b/arch/um/kernel/skas/process.c
@@ -35,7 +35,7 @@ static int __init start_kernel_proc(void *unused)
 {
 	int pid;
 
-	block_signals();
+	local_irq_disable();
 	pid = os_getpid();
 
 	cpu_tasks[0].pid = pid;


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