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powerpc: Fill in si_addr_lsb siginfo field 

Fill in the si_addr_lsb siginfo field so the hwpoison code can
pass to userspace the length of memory that has been corrupted.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Anton Blanchard 2014-09-24 16:59:58 +10:00 committed by Michael Ellerman
parent 3913fdd7a2
commit 9d57472f61
1 changed files with 8 additions and 0 deletions
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8
arch/powerpc/mm/fault.c
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@ -33,6 +33,7 @@
#include <linux/magic.h>
#include <linux/ratelimit.h>
#include <linux/context_tracking.h>
#include <linux/hugetlb.h>
#include <asm/firmware.h>
#include <asm/page.h>
@ -118,6 +119,7 @@ static int do_sigbus(struct pt_regs *regs, unsigned long address,
unsigned int fault)
{
siginfo_t info;
unsigned int lsb = 0;
up_read(&current->mm->mmap_sem);
@ -135,7 +137,13 @@ static int do_sigbus(struct pt_regs *regs, unsigned long address,
current->comm, current->pid, address);
info.si_code = BUS_MCEERR_AR;
}
if (fault & VM_FAULT_HWPOISON_LARGE)
lsb = hstate_index_to_shift(VM_FAULT_GET_HINDEX(fault));
if (fault & VM_FAULT_HWPOISON)
lsb = PAGE_SHIFT;
#endif
info.si_addr_lsb = lsb;
force_sig_info(SIGBUS, &info, current);
return MM_FAULT_RETURN;
}