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Commit 606f95e4 authored by Helge Deller's avatar Helge Deller
Browse files

parisc: Add HWPOISON page fault handler code 



Commit 24587380 ("parisc: Add MADV_HWPOISON and MADV_SOFT_OFFLINE") added
the necessary constants to handle hardware-poisoning. Those were needed to
support the page deallocation feature from firmware.

But I completely missed to add the relevant fault handler code. This now
showed up when I ran the madvise07 testcase from the Linux Test Project,
which failed with a kernel BUG at arch/parisc/mm/fault.c:320.

With this patch the parisc kernel now behaves like other platforms and
gives the same kernel syslog warnings when poisoning pages.

Signed-off-by: default avatarHelge Deller <deller@gmx.de>
parent a7e6601f

arch/parisc/mm/fault.c

+29 −4
Original line number Diff line number Diff line
@@ -17,6 +17,7 @@ 
#include <linux/interrupt.h>

#include <linux/extable.h>

#include <linux/uaccess.h>

#include <linux/hugetlb.h>



#include <asm/traps.h>
@@ -261,7 +262,7 @@ void do_page_fault(struct pt_regs *regs, unsigned long code, 
	struct task_struct *tsk;

	struct mm_struct *mm;

	unsigned long acc_type;

	int fault;

	int fault = 0;

	unsigned int flags;



	if (faulthandler_disabled())
@@ -315,7 +316,8 @@ void do_page_fault(struct pt_regs *regs, unsigned long code, 
			goto out_of_memory;

		else if (fault & VM_FAULT_SIGSEGV)

			goto bad_area;

		else if (fault & VM_FAULT_SIGBUS)

		else if (fault & (VM_FAULT_SIGBUS|VM_FAULT_HWPOISON|

				  VM_FAULT_HWPOISON_LARGE))

			goto bad_area;

		BUG();

	}
@@ -352,8 +354,7 @@ void do_page_fault(struct pt_regs *regs, unsigned long code, 


	if (user_mode(regs)) {

		struct siginfo si;



		show_signal_msg(regs, code, address, tsk, vma);

		unsigned int lsb = 0;



		switch (code) {

		case 15:	/* Data TLB miss fault/Data page fault */
@@ -386,6 +387,30 @@ void do_page_fault(struct pt_regs *regs, unsigned long code, 
			si.si_code = (code == 26) ? SEGV_ACCERR : SEGV_MAPERR;

			break;

		}



#ifdef CONFIG_MEMORY_FAILURE

		if (fault & (VM_FAULT_HWPOISON|VM_FAULT_HWPOISON_LARGE)) {

			printk(KERN_ERR

	"MCE: Killing %s:%d due to hardware memory corruption fault at %08lx\n",

			tsk->comm, tsk->pid, address);

			si.si_signo = SIGBUS;

			si.si_code = BUS_MCEERR_AR;

		}

#endif



		/*

		 * Either small page or large page may be poisoned.

		 * In other words, VM_FAULT_HWPOISON_LARGE and

		 * VM_FAULT_HWPOISON are mutually exclusive.

		 */

		if (fault & VM_FAULT_HWPOISON_LARGE)

			lsb = hstate_index_to_shift(VM_FAULT_GET_HINDEX(fault));

		else if (fault & VM_FAULT_HWPOISON)

			lsb = PAGE_SHIFT;

		else

			show_signal_msg(regs, code, address, tsk, vma);

		si.si_addr_lsb = lsb;



		si.si_errno = 0;

		si.si_addr = (void __user *) address;

		force_sig_info(si.si_signo, &si, current);