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Commit af93ebc0 authored by Andi Kleen's avatar Andi Kleen Committed by Thomas Gleixner
Browse files

x86: remove page_fault_trace 



Old debugging code that is not really needed anymore. If someone
wants it it would be better replaced with a systemtap script or
kprobe.

This avoids a potential cache miss during page fault processing.

[ mingo: arch/x86 adaptation ]

Signed-off-by: default avatarAndi Kleen <ak@suse.de>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent 096708dc

arch/x86/mm/fault_64.c

+0 −12
Original line number Diff line number Diff line
@@ -285,7 +285,6 @@ static int vmalloc_fault(unsigned long address) 
	return 0;

}



static int page_fault_trace;

int show_unhandled_signals = 1;



/*
@@ -354,10 +353,6 @@ asmlinkage void __kprobes do_page_fault(struct pt_regs *regs, 
	if (likely(regs->eflags & X86_EFLAGS_IF))

		local_irq_enable();



	if (unlikely(page_fault_trace))

		printk("pagefault rip:%lx rsp:%lx cs:%lu ss:%lu address %lx error %lx\n",

		       regs->rip,regs->rsp,regs->cs,regs->ss,address,error_code); 



	if (unlikely(error_code & PF_RSVD))

		pgtable_bad(address, regs, error_code);
@@ -621,10 +616,3 @@ void vmalloc_sync_all(void) 
	BUILD_BUG_ON(!(((MODULES_END - 1) & PGDIR_MASK) == 

				(__START_KERNEL & PGDIR_MASK)));

}
 


static int __init enable_pagefaulttrace(char *str)

{

	page_fault_trace = 1;

	return 1;

}

__setup("pagefaulttrace", enable_pagefaulttrace);