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Commit f2c76e3b authored by Heiko Carstens's avatar Heiko Carstens Committed by Martin Schwidefsky
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s390/mm: make page faults killable 



This is the s390 variant of 37b23e05 "x86,mm: make pagefault killable".

Signed-off-by: default avatarHeiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent 216550e4

arch/s390/mm/fault.c

+11 −1
Original line number Diff line number Diff line
@@ -49,6 +49,7 @@ 
#define VM_FAULT_BADCONTEXT	0x010000

#define VM_FAULT_BADMAP		0x020000

#define VM_FAULT_BADACCESS	0x040000

#define VM_FAULT_SIGNAL	0x080000



static unsigned long store_indication;
@@ -229,6 +230,10 @@ static noinline void do_fault_error(struct pt_regs *regs, int fault) 
	case VM_FAULT_BADCONTEXT:

		do_no_context(regs);

		break;

	case VM_FAULT_SIGNAL:

		if (!user_mode(regs))

			do_no_context(regs);

		break;

	default: /* fault & VM_FAULT_ERROR */

		if (fault & VM_FAULT_OOM) {

			if (!(regs->psw.mask & PSW_MASK_PSTATE))
@@ -286,7 +291,7 @@ static inline int do_exception(struct pt_regs *regs, int access) 


	address = trans_exc_code & __FAIL_ADDR_MASK;

	perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS, 1, regs, address);

	flags = FAULT_FLAG_ALLOW_RETRY;

	flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE;

	if (access == VM_WRITE || (trans_exc_code & store_indication) == 0x400)

		flags |= FAULT_FLAG_WRITE;

	down_read(&mm->mmap_sem);
@@ -335,6 +340,11 @@ static inline int do_exception(struct pt_regs *regs, int access) 
	 * the fault.

	 */

	fault = handle_mm_fault(mm, vma, address, flags);

	/* No reason to continue if interrupted by SIGKILL. */

	if ((fault & VM_FAULT_RETRY) && fatal_signal_pending(current)) {

		fault = VM_FAULT_SIGNAL;

		goto out;

	}

	if (unlikely(fault & VM_FAULT_ERROR))

		goto out_up;