signal/arm64: For clarity separate the 3 signal sending cases in do_page_fault

It gets easy to confuse what is going on when some code is shared and some not
so stop sharing the trivial bits of signal generation to make future updates
easier to understand.

Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Tested-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>

arch/arm64/mm/fault.c

@@ -567,16 +567,16 @@ retry:
 		return 0;
 	}
 
-	clear_siginfo(&si);
-	si.si_addr = (void __user *)addr;
-
 	if (fault & VM_FAULT_SIGBUS) {
 		/*
 		 * We had some memory, but were unable to successfully fix up
 		 * this page fault.
 		 */
+		clear_siginfo(&si);
 		si.si_signo	= SIGBUS;
 		si.si_code	= BUS_ADRERR;
+		si.si_addr = (void __user *)addr;
+		__do_user_fault(&si, esr);
 	} else if (fault & (VM_FAULT_HWPOISON_LARGE | VM_FAULT_HWPOISON)) {
 		unsigned int lsb;
 
@@ -584,20 +584,25 @@ retry:
 		if (fault & VM_FAULT_HWPOISON_LARGE)
 			lsb = hstate_index_to_shift(VM_FAULT_GET_HINDEX(fault));
 
+		clear_siginfo(&si);
 		si.si_signo	= SIGBUS;
 		si.si_code	= BUS_MCEERR_AR;
+		si.si_addr = (void __user *)addr;
 		si.si_addr_lsb	= lsb;
+		__do_user_fault(&si, esr);
 	} else {
 		/*
 		 * Something tried to access memory that isn't in our memory
 		 * map.
 		 */
+		clear_siginfo(&si);
 		si.si_signo	= SIGSEGV;
 		si.si_code	= fault == VM_FAULT_BADACCESS ?
 				  SEGV_ACCERR : SEGV_MAPERR;
+		si.si_addr = (void __user *)addr;
+		__do_user_fault(&si, esr);
 	}
 
-	__do_user_fault(&si, esr);
 	return 0;
 
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