---

yaml
---
r: 14222
b: refs/heads/master
c: 9e43e1b
h: refs/heads/master
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: ffd10a2b77bca50dd05ba26acd5a6e68bcc8f61f
+refs/heads/master: 9e43e1b7c7c9872da032442d8e4bb112a02d16f4

trunk/Documentation/x86_64/boot-options.txt

@@ -193,6 +193,9 @@ Debugging
 
   kstack=N   Print that many words from the kernel stack in oops dumps.
 
+  pagefaulttrace Dump all page faults. Only useful for extreme debugging
+		and will create a lot of output.
+
 Misc
 
   noreplacement  Don't replace instructions with more appropiate ones

trunk/arch/x86_64/Kconfig.debug

@@ -2,15 +2,6 @@ menu "Kernel hacking"
 
 source "lib/Kconfig.debug"
 
-# !SMP for now because the context switch early causes GPF in segment reloading
-# and the GS base checking does the wrong thing then, causing a hang.
-config CHECKING
-	bool "Additional run-time checks"
-	depends on DEBUG_KERNEL && !SMP
-	help
-	  Enables some internal consistency checks for kernel debugging.
-	  You should normally say N.
-
 config INIT_DEBUG
 	bool "Debug __init statements"
 	depends on DEBUG_KERNEL

trunk/arch/x86_64/kernel/traps.c

@@ -428,19 +428,6 @@ static void __kprobes do_trap(int trapnr, int signr, char *str,
 {
 	conditional_sti(regs);
 
-#ifdef CONFIG_CHECKING
-       { 
-               unsigned long gs; 
-               struct x8664_pda *pda = cpu_pda + safe_smp_processor_id(); 
-               rdmsrl(MSR_GS_BASE, gs); 
-               if (gs != (unsigned long)pda) { 
-                       wrmsrl(MSR_GS_BASE, pda); 
-                       printk("%s: wrong gs %lx expected %p rip %lx\n", str, gs, pda,
-			      regs->rip);
-               }
-       }
-#endif
-
 	if (user_mode(regs)) {
 		struct task_struct *tsk = current;
 
@@ -513,20 +500,6 @@ asmlinkage void __kprobes do_general_protection(struct pt_regs * regs,
 {
 	conditional_sti(regs);
 
-#ifdef CONFIG_CHECKING
-       { 
-               unsigned long gs; 
-               struct x8664_pda *pda = cpu_pda + safe_smp_processor_id(); 
-               rdmsrl(MSR_GS_BASE, gs); 
-               if (gs != (unsigned long)pda) { 
-                       wrmsrl(MSR_GS_BASE, pda); 
-		       oops_in_progress++;
-                       printk("general protection handler: wrong gs %lx expected %p\n", gs, pda);
-		       oops_in_progress--;
-               }
-       }
-#endif
-
 	if (user_mode(regs)) {
 		struct task_struct *tsk = current;
 
@@ -665,19 +638,6 @@ asmlinkage void __kprobes do_debug(struct pt_regs * regs,
 	struct task_struct *tsk = current;
 	siginfo_t info;
 
-#ifdef CONFIG_CHECKING
-       { 
-	       /* RED-PEN interaction with debugger - could destroy gs */
-               unsigned long gs; 
-               struct x8664_pda *pda = cpu_pda + safe_smp_processor_id(); 
-               rdmsrl(MSR_GS_BASE, gs); 
-               if (gs != (unsigned long)pda) { 
-                       wrmsrl(MSR_GS_BASE, pda); 
-                       printk("debug handler: wrong gs %lx expected %p\n", gs, pda);
-               }
-       }
-#endif
-
 	get_debugreg(condition, 6);
 
 	if (notify_die(DIE_DEBUG, "debug", regs, condition, error_code,

trunk/arch/x86_64/mm/fault.c

@@ -308,18 +308,6 @@ asmlinkage void __kprobes do_page_fault(struct pt_regs *regs,
 	unsigned long flags;
 	siginfo_t info;
 
-#ifdef CONFIG_CHECKING
-	{ 
-		unsigned long gs; 
-		struct x8664_pda *pda = cpu_pda + stack_smp_processor_id(); 
-		rdmsrl(MSR_GS_BASE, gs); 
-		if (gs != (unsigned long)pda) { 
-			wrmsrl(MSR_GS_BASE, pda); 
-			printk("page_fault: wrong gs %lx expected %p\n", gs, pda);
-		}
-	}
-#endif
-
 	/* get the address */
 	__asm__("movq %%cr2,%0":"=r" (address));
 	if (notify_die(DIE_PAGE_FAULT, "page fault", regs, error_code, 14,
@@ -571,3 +559,10 @@ asmlinkage void __kprobes do_page_fault(struct pt_regs *regs,
 	force_sig_info(SIGBUS, &info, tsk);
 	return;
 }
+
+static int __init enable_pagefaulttrace(char *str)
+{
+	page_fault_trace = 1;
+	return 0;
+}
+__setup("pagefaulttrace", enable_pagefaulttrace);

trunk/arch/x86_64/mm/init.c

@@ -565,10 +565,6 @@ extern int exception_trace, page_fault_trace;
 static ctl_table debug_table2[] = {
 	{ 99, "exception-trace", &exception_trace, sizeof(int), 0644, NULL,
 	  proc_dointvec },
-#ifdef CONFIG_CHECKING
-	{ 100, "page-fault-trace", &page_fault_trace, sizeof(int), 0644, NULL,
-	  proc_dointvec },
-#endif
 	{ 0, }
 };