Merge /scratch/Ksrc/linux-git/

4 files changed, 48 insertions, 24 deletions

diff --git a/arch/um/kernel/helper.c b/arch/um/kernel/helper.c
index 13b1f5c2f7e..f83e1e8e239 100644
--- a/arch/um/kernel/helper.c
+++ b/arch/um/kernel/helper.c
@@ -13,6 +13,7 @@
 #include "user.h"
 #include "kern_util.h"
 #include "user_util.h"
+#include "helper.h"
 #include "os.h"
 
 struct helper_data {
@@ -149,7 +150,7 @@ int run_helper_thread(int (*proc)(void *), void *arg, unsigned int flags,
 	return(pid);
 }
 
-int helper_wait(int pid, int block)
+int helper_wait(int pid)
 {
 	int ret;
 
@@ -160,14 +161,3 @@ int helper_wait(int pid, int block)
 	}
 	return(ret);
 }
-
-/*
- * 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:
- */
diff --git a/arch/um/kernel/process.c b/arch/um/kernel/process.c
index c45a60e9c92..8b01a5584e8 100644
--- a/arch/um/kernel/process.c
+++ b/arch/um/kernel/process.c
@@ -212,12 +212,26 @@ static int stop_ptraced_child(int pid, int exitcode, int mustexit)
 
 static int force_sysemu_disabled = 0;
 
+int ptrace_faultinfo = 1;
+int proc_mm = 1;
+
+static int __init skas0_cmd_param(char *str, int* add)
+{
+	ptrace_faultinfo = proc_mm = 0;
+	return 0;
+}
+
 static int __init nosysemu_cmd_param(char *str, int* add)
 {
 	force_sysemu_disabled = 1;
 	return 0;
 }
 
+__uml_setup("skas0", skas0_cmd_param,
+		"skas0\n"
+		"    Disables SKAS3 usage, so that SKAS0 is used, unless you \n"
+		"    specify mode=tt.\n\n");
+
 __uml_setup("nosysemu", nosysemu_cmd_param,
 		"nosysemu\n"
 		"    Turns off syscall emulation patch for ptrace (SYSEMU) on.\n"
@@ -359,12 +373,10 @@ void forward_pending_sigio(int target)
 		kill(target, SIGIO);
 }
 
-int ptrace_faultinfo = 0;
-int proc_mm = 1;
-
 extern void *__syscall_stub_start, __syscall_stub_end;
 
 #ifdef UML_CONFIG_MODE_SKAS
+
 static inline void check_skas3_ptrace_support(void)
 {
 	struct ptrace_faultinfo fi;
@@ -375,6 +387,7 @@ static inline void check_skas3_ptrace_support(void)
 
 	n = ptrace(PTRACE_FAULTINFO, pid, 0, &fi);
 	if (n < 0) {
+		ptrace_faultinfo = 0;
 		if(errno == EIO)
 			printf("not found\n");
 		else {
@@ -382,8 +395,10 @@ static inline void check_skas3_ptrace_support(void)
 		}
 	}
 	else {
-		ptrace_faultinfo = 1;
-		printf("found\n");
+		if (!ptrace_faultinfo)
+			printf("found but disabled on command line\n");
+		else
+			printf("found\n");
 	}
 
 	init_registers(pid);
@@ -396,13 +411,13 @@ int can_do_skas(void)
 	if (os_access("/proc/mm", OS_ACC_W_OK) < 0) {
 		proc_mm = 0;
 		printf("not found\n");
-		goto out;
-	}
-	else {
-		printf("found\n");
+	} else {
+		if (!proc_mm)
+			printf("found but disabled on command line\n");
+		else
+			printf("found\n");
 	}
 
-out:
 	check_skas3_ptrace_support();
 	return 1;
 }
diff --git a/arch/um/kernel/skas/syscall_user.c b/arch/um/kernel/skas/syscall_user.c
index 2828e6e3772..6b066497014 100644
--- a/arch/um/kernel/skas/syscall_user.c
+++ b/arch/um/kernel/skas/syscall_user.c
@@ -15,7 +15,7 @@
 void handle_syscall(union uml_pt_regs *regs)
 {
 	long result;
-#if UML_CONFIG_SYSCALL_DEBUG
+#ifdef UML_CONFIG_SYSCALL_DEBUG
   	int index;
 
   	index = record_syscall_start(UPT_SYSCALL_NR(regs));
@@ -27,7 +27,7 @@ void handle_syscall(union uml_pt_regs *regs)
 	REGS_SET_SYSCALL_RETURN(regs->skas.regs, result);
 
 	syscall_trace(regs, 1);
-#if UML_CONFIG_SYSCALL_DEBUG
+#ifdef UML_CONFIG_SYSCALL_DEBUG
   	record_syscall_end(index, result);
 #endif
 }
diff --git a/arch/um/kernel/um_arch.c b/arch/um/kernel/um_arch.c
index 8736d098f0e..ca2bb6f09a7 100644
--- a/arch/um/kernel/um_arch.c
+++ b/arch/um/kernel/um_arch.c
@@ -38,6 +38,9 @@
 #include "choose-mode.h"
 #include "mode_kern.h"
 #include "mode.h"
+#ifdef UML_CONFIG_MODE_SKAS
+#include "skas.h"
+#endif
 
 #define DEFAULT_COMMAND_LINE "root=98:0"
 
@@ -318,6 +321,7 @@ int linux_main(int argc, char **argv)
 	unsigned long avail, diff;
 	unsigned long virtmem_size, max_physmem;
 	unsigned int i, add;
+	char * mode;
 
 	for (i = 1; i < argc; i++){
 		if((i == 1) && (argv[i][0] == ' ')) continue;
@@ -338,6 +342,21 @@ int linux_main(int argc, char **argv)
 		exit(1);
 	}
 #endif
+
+#ifndef CONFIG_MODE_SKAS
+	mode = "TT";
+#else
+	/* Show to the user the result of selection */
+	if (mode_tt)
+		mode = "TT";
+	else if (proc_mm && ptrace_faultinfo)
+		mode = "SKAS3";
+	else
+		mode = "SKAS0";
+#endif
+
+	printf("UML running in %s mode\n", mode);
+
 	uml_start = CHOOSE_MODE_PROC(set_task_sizes_tt, set_task_sizes_skas, 0,
 				     &host_task_size, &task_size);