linux-kernel - [PATCH 3/6] UML

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Date:	Wed, 9 May 2007 16:27:21 -0400
From:	Jeff Dike <jdike@...toit.com>
To:	Andrew Morton <akpm@...l.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	uml-devel <user-mode-linux-devel@...ts.sourceforge.net>
Subject: [PATCH 3/6] UML - Tidy IRQ code

Some tidying of the irq code before introducing irq stacks.  Mostly
style fixes, but the timer handler calls the timer code directly
rather than going through the generic sig_handler_common_skas.

Signed-off-by: Jeff Dike <jdike@...ux.intel.com>
--
 arch/um/kernel/init_task.c      |   11 -----------
 arch/um/kernel/irq.c            |    4 ++--
 arch/um/os-Linux/signal.c       |   10 +++++++---
 arch/um/os-Linux/skas/process.c |    6 ++++--
 4 files changed, 13 insertions(+), 18 deletions(-)

Index: linux-2.6.21-mm/arch/um/kernel/init_task.c
===================================================================
--- linux-2.6.21-mm.orig/arch/um/kernel/init_task.c	2007-05-07 14:52:28.000000000 -0400
+++ linux-2.6.21-mm/arch/um/kernel/init_task.c	2007-05-07 14:56:24.000000000 -0400
@@ -46,14 +46,3 @@ void unprotect_stack(unsigned long stack
 {
 	os_protect_memory((void *) stack, THREAD_SIZE, 1, 1, 0);
 }
-
-/*
- * Overrides for Emacs so that we follow Linus's tabbing style.
- * Emacs will notice this stuff at the end of the file and automatically
- * adjust the settings for this buffer only.  This must remain at the end
- * of the file.
- * ---------------------------------------------------------------------------
- * Local variables:
- * c-file-style: "linux"
- * End:
- */
Index: linux-2.6.21-mm/arch/um/kernel/irq.c
===================================================================
--- linux-2.6.21-mm.orig/arch/um/kernel/irq.c	2007-05-07 14:52:28.000000000 -0400
+++ linux-2.6.21-mm/arch/um/kernel/irq.c	2007-05-07 14:56:24.000000000 -0400
@@ -1,4 +1,4 @@
-/* 
+/*
  * Copyright (C) 2000 Jeff Dike (jdike@...aya.com)
  * Licensed under the GPL
  * Derived (i.e. mostly copied) from arch/i386/kernel/irq.c:
@@ -53,7 +53,7 @@ int show_interrupts(struct seq_file *p, 
 	if (i < NR_IRQS) {
 		spin_lock_irqsave(&irq_desc[i].lock, flags);
 		action = irq_desc[i].action;
-		if (!action) 
+		if (!action)
 			goto skip;
 		seq_printf(p, "%3d: ",i);
 #ifndef CONFIG_SMP
Index: linux-2.6.21-mm/arch/um/os-Linux/signal.c
===================================================================
--- linux-2.6.21-mm.orig/arch/um/os-Linux/signal.c	2007-05-07 14:52:28.000000000 -0400
+++ linux-2.6.21-mm/arch/um/os-Linux/signal.c	2007-05-07 14:56:24.000000000 -0400
@@ -61,15 +61,19 @@ void sig_handler(int sig, struct sigcont
 
 static void real_alarm_handler(int sig, struct sigcontext *sc)
 {
+	union uml_pt_regs regs;
+
 	if(sig == SIGALRM)
 		switch_timers(0);
 
-	CHOOSE_MODE_PROC(sig_handler_common_tt, sig_handler_common_skas,
-			 sig, sc);
+	if(sc != NULL)
+		copy_sc(&regs, sc);
+	regs.skas.is_user = 0;
+	unblock_signals();
+	timer_handler(sig, &regs);
 
 	if(sig == SIGALRM)
 		switch_timers(1);
-
 }
 
 void alarm_handler(int sig, struct sigcontext *sc)
Index: linux-2.6.21-mm/arch/um/os-Linux/skas/process.c
===================================================================
--- linux-2.6.21-mm.orig/arch/um/os-Linux/skas/process.c	2007-05-07 14:52:28.000000000 -0400
+++ linux-2.6.21-mm/arch/um/os-Linux/skas/process.c	2007-05-07 14:56:24.000000000 -0400
@@ -288,7 +288,8 @@ int start_userspace(unsigned long stub_s
 void userspace(union uml_pt_regs *regs)
 {
 	int err, status, op, pid = userspace_pid[0];
-	int local_using_sysemu; /*To prevent races if using_sysemu changes under us.*/
+	/* To prevent races if using_sysemu changes under us.*/
+	int local_using_sysemu;
 
 	while(1){
 		restore_registers(pid, regs);
@@ -296,7 +297,8 @@ void userspace(union uml_pt_regs *regs)
 		/* Now we set local_using_sysemu to be used for one loop */
 		local_using_sysemu = get_using_sysemu();
 
-		op = SELECT_PTRACE_OPERATION(local_using_sysemu, singlestepping(NULL));
+		op = SELECT_PTRACE_OPERATION(local_using_sysemu,
+					     singlestepping(NULL));
 
 		err = ptrace(op, pid, 0, 0);
 		if(err)
-
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