diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c index 2069e9bc0fca..d224c9d384a1 100644 --- a/arch/arm64/mm/fault.c +++ b/arch/arm64/mm/fault.c @@ -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)