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parisc: Add HWPOISON page fault handler code 

Commit 24587380f6 ("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: Helge Deller <deller@gmx.de>
This commit is contained in:
Helge Deller 2017-09-21 21:52:08 +02:00
parent a7e6601f70
commit 606f95e425
1 changed files with 29 additions and 4 deletions
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33
arch/parisc/mm/fault.c
View File

@ -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 @@ good_area:
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 @@ bad_area:
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 @@ bad_area:
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);