[PATCH] uml: remove syscall debugging

Eliminate an unused debug option.
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

arch/um/Kconfig.debug

@@ -47,13 +47,4 @@ config GCOV
         If you're involved in UML kernel development and want to use gcov,
         say Y.  If you're unsure, say N.
 
-config SYSCALL_DEBUG
-	bool "Enable system call debugging"
-	depends on DEBUG_INFO
-	help
-	This adds some system debugging to UML, including keeping a ring buffer
-	with recent system calls and some global and per-task statistics.
-
-	If unsure, say N
-
 endmenu

arch/um/defconfig

@@ -526,4 +526,3 @@ CONFIG_FORCED_INLINING=y
 # CONFIG_RCU_TORTURE_TEST is not set
 # CONFIG_GPROF is not set
 # CONFIG_GCOV is not set
-# CONFIG_SYSCALL_DEBUG is not set

arch/um/kernel/Makefile

@@ -15,7 +15,6 @@ obj-y = config.o exec_kern.o exitcode.o \
 obj-$(CONFIG_BLK_DEV_INITRD) += initrd.o
 obj-$(CONFIG_GPROF)	+= gprof_syms.o
 obj-$(CONFIG_GCOV)	+= gmon_syms.o
-obj-$(CONFIG_SYSCALL_DEBUG) += syscall.o
 
 obj-$(CONFIG_MODE_TT) += tt/
 obj-$(CONFIG_MODE_SKAS) += skas/

arch/um/kernel/skas/syscall.c

@@ -18,11 +18,7 @@ void handle_syscall(union uml_pt_regs *r)
 	struct pt_regs *regs = container_of(r, struct pt_regs, regs);
 	long result;
 	int syscall;
-#ifdef UML_CONFIG_SYSCALL_DEBUG
-  	int index;
 
-  	index = record_syscall_start(UPT_SYSCALL_NR(r));
-#endif
 	syscall_trace(r, 0);
 
 	current->thread.nsyscalls++;
@@ -44,7 +40,4 @@ void handle_syscall(union uml_pt_regs *r)
 	REGS_SET_SYSCALL_RETURN(r->skas.regs, result);
 
 	syscall_trace(r, 1);
-#ifdef UML_CONFIG_SYSCALL_DEBUG
-  	record_syscall_end(index, result);
-#endif
 }

arch/um/kernel/syscall.c

-/*
- * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
- * Licensed under the GPL
- */
-
-#include "kern_util.h"
-#include "syscall.h"
-#include "os.h"
-
-struct {
-	int syscall;
-	int pid;
-	long result;
-	unsigned long long start;
-	unsigned long long end;
-} syscall_record[1024];
-
-int record_syscall_start(int syscall)
-{
-	int max, index;
-
-	max = sizeof(syscall_record)/sizeof(syscall_record[0]);
-	index = next_syscall_index(max);
-
-	syscall_record[index].syscall = syscall;
-	syscall_record[index].pid = current_pid();
-	syscall_record[index].result = 0xdeadbeef;
-	syscall_record[index].start = os_nsecs();
-	return(index);
-}
-
-void record_syscall_end(int index, long result)
-{
-	syscall_record[index].result = result;
-	syscall_record[index].end = os_nsecs();
-}

arch/um/kernel/tt/syscall_kern.c

@@ -21,18 +21,11 @@ void syscall_handler_tt(int sig, struct pt_regs *regs)
 	void *sc;
 	long result;
 	int syscall;
-#ifdef CONFIG_SYSCALL_DEBUG
-	int index;
-#endif
+
 	sc = UPT_SC(&regs->regs);
 	SC_START_SYSCALL(sc);
 
 	syscall = UPT_SYSCALL_NR(&regs->regs);
-
-#ifdef CONFIG_SYSCALL_DEBUG
-	index = record_syscall_start(syscall);
-#endif
-
 	syscall_trace(&regs->regs, 0);
 
 	current->thread.nsyscalls++;
@@ -50,7 +43,4 @@ void syscall_handler_tt(int sig, struct pt_regs *regs)
 	SC_SET_SYSCALL_RETURN(sc, result);
 
 	syscall_trace(&regs->regs, 1);
-#ifdef CONFIG_SYSCALL_DEBUG
-  	record_syscall_end(index, result);
-#endif
 }

arch/um/kernel/tt/tracer.c

@@ -188,10 +188,7 @@ int tracer(int (*init_proc)(void *), void *sp)
 	int status, pid = 0, sig = 0, cont_type, tracing = 0, op = 0;
 	int proc_id = 0, n, err, old_tracing = 0, strace = 0;
 	int local_using_sysemu = 0;
-#ifdef UML_CONFIG_SYSCALL_DEBUG
-	unsigned long eip = 0;
-	int last_index;
-#endif
+
 	signal(SIGPIPE, SIG_IGN);
 	setup_tracer_winch();
 	tracing_pid = os_getpid();
@@ -282,23 +279,6 @@ int tracer(int (*init_proc)(void *), void *sp)
 		else if(WIFSTOPPED(status)){
 			proc_id = pid_to_processor_id(pid);
 			sig = WSTOPSIG(status);
-#ifdef UML_CONFIG_SYSCALL_DEBUG
-			if(signal_index[proc_id] == 1024){
-				signal_index[proc_id] = 0;
-				last_index = 1023;
-			}
-			else last_index = signal_index[proc_id] - 1;
-			if(((sig == SIGPROF) || (sig == SIGVTALRM) ||
-			    (sig == SIGALRM)) &&
-			   (signal_record[proc_id][last_index].signal == sig)&&
-			   (signal_record[proc_id][last_index].pid == pid))
-				signal_index[proc_id] = last_index;
-			signal_record[proc_id][signal_index[proc_id]].pid = pid;
-			gettimeofday(&signal_record[proc_id][signal_index[proc_id]].time, NULL);
-			eip = ptrace(PTRACE_PEEKUSR, pid, PT_IP_OFFSET, 0);
-			signal_record[proc_id][signal_index[proc_id]].addr = eip;
-			signal_record[proc_id][signal_index[proc_id]++].signal = sig;
-#endif
 			if(proc_id == -1){
 				sleeping_process_signal(pid, sig);
 				continue;