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Commit 9d57472f authored by Anton Blanchard's avatar Anton Blanchard Committed by Michael Ellerman
Browse files

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: default avatarAnton Blanchard <anton@samba.org>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent 3913fdd7

arch/powerpc/mm/fault.c

+8 −0
Original line number Diff line number Diff line
@@ -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;

}