arm64: mm: Remove useless and wrong comments from fault.c (f67d5c4f) · Commits · 戴 / test

arch/arm64/mm/fault.c

+1 −51

Original line number	Diff line number	Diff line
		@@ -105,9 +105,6 @@ static void data_abort_decode(unsigned int esr)
		(esr & ESR_ELx_WNR) >> ESR_ELx_WNR_SHIFT);
		}

		/*
		* Decode mem abort information
		*/
		static void mem_abort_decode(unsigned int esr)
		{
		pr_alert("Mem abort info:\n");
		@@ -249,9 +246,6 @@ static inline bool is_permission_fault(unsigned int esr, struct pt_regs *regs,
		return false;
		}

		/*
		* The kernel tried to access some page that wasn't present.
		*/
		static void __do_kernel_fault(unsigned long addr, unsigned int esr,
		struct pt_regs *regs)
		{
		@@ -264,9 +258,6 @@ static void __do_kernel_fault(unsigned long addr, unsigned int esr,
		if (!is_el1_instruction_abort(esr) && fixup_exception(regs))
		return;

		/*
		* No handler, we'll have to terminate things with extreme prejudice.
		*/
		bust_spinlocks(1);

		if (is_permission_fault(esr, regs, addr)) {
		@@ -291,10 +282,6 @@ static void __do_kernel_fault(unsigned long addr, unsigned int esr,
		do_exit(SIGKILL);
		}

		/*
		* Something tried to access memory that isn't in our memory map. User mode
		* accesses just cause a SIGSEGV
		*/
		static void __do_user_fault(struct task_struct *tsk, unsigned long addr,
		unsigned int esr, unsigned int sig, int code,
		struct pt_regs *regs, int fault)
		@@ -559,23 +546,6 @@ no_context:
		return 0;
		}

		/*
		* First Level Translation Fault Handler
		*
		* We enter here because the first level page table doesn't contain a valid
		* entry for the address.
		*
		* If the address is in kernel space (>= TASK_SIZE), then we are probably
		* faulting in the vmalloc() area.
		*
		* If the init_task's first level page tables contains the relevant entry, we
		* copy the it to this task. If not, we send the process a signal, fixup the
		* exception, or oops the kernel.
		*
		* NOTE! We MUST NOT take any locks for this case. We may be in an interrupt
		* or a critical region, and should only copy the information from the master
		* page table, nothing more.
		*/
		static int __kprobes do_translation_fault(unsigned long addr,
		unsigned int esr,
		struct pt_regs *regs)
		@@ -594,18 +564,11 @@ static int do_alignment_fault(unsigned long addr, unsigned int esr,
		return 0;
		}

		/*
		* This abort handler always returns "fault".
		*/
		static int do_bad(unsigned long addr, unsigned int esr, struct pt_regs *regs)
		{
		return 1;
		return 1; /* "fault" */
		}

		/*
		* This abort handler deals with Synchronous External Abort.
		* It calls notifiers, and then returns "fault".
		*/
		static int do_sea(unsigned long addr, unsigned int esr, struct pt_regs *regs)
		{
		struct siginfo info;
		@@ -710,13 +673,6 @@ static const struct fault_info fault_info[] = {
		{ do_bad, SIGBUS, 0, "unknown 63" },
		};

		/*
		* Handle Synchronous External Aborts that occur in a guest kernel.
		*
		* The return value will be zero if the SEA was successfully handled
		* and non-zero if there was an error processing the error or there was
		* no error to process.
		*/
		int handle_guest_sea(phys_addr_t addr, unsigned int esr)
		{
		int ret = -ENOENT;
		@@ -727,9 +683,6 @@ int handle_guest_sea(phys_addr_t addr, unsigned int esr)
		return ret;
		}

		/*
		* Dispatch a data abort to the relevant handler.
		*/
		asmlinkage void __exception do_mem_abort(unsigned long addr, unsigned int esr,
		struct pt_regs *regs)
		{
		@@ -751,9 +704,6 @@ asmlinkage void __exception do_mem_abort(unsigned long addr, unsigned int esr,
		arm64_notify_die("", regs, &info, esr);
		}

		/*
		* Handle stack alignment exceptions.
		*/
		asmlinkage void __exception do_sp_pc_abort(unsigned long addr,
		unsigned int esr,
		struct pt_regs *regs)

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