[REVIEW][PATCH 11/15] signal/arm64: Add and use arm64_force_sig_mceerr as appropriate

[Eric W. Biederman]

Add arm64_force_sig_mceerr for consistency with arm64_force_sig_fault,
and use it in the one location that can take advantage of it.

This removes the fiddly filling out of siginfo before sending a signal
reporting an memory error to userspace.

Signed-off-by: "Eric W. Biederman" <ebied...@xmission.com>
---
 arch/arm64/include/asm/traps.h | 1 +
 arch/arm64/kernel/traps.c      | 7 +++++++
 arch/arm64/mm/fault.c          | 9 ++-------
 3 files changed, 10 insertions(+), 7 deletions(-)

diff --git a/arch/arm64/include/asm/traps.h b/arch/arm64/include/asm/traps.h
index 08e99901edbc..193f0b0e8ee3 100644
--- a/arch/arm64/include/asm/traps.h
+++ b/arch/arm64/include/asm/traps.h
@@ -38,6 +38,7 @@ void unregister_undef_hook(struct undef_hook *hook);
 void force_signal_inject(int signal, int code, unsigned long address);
 void arm64_notify_segfault(unsigned long addr);
 void arm64_force_sig_fault(int signo, int code, void __user *addr, const char 
*str);
+void arm64_force_sig_mceerr(int code, void __user *addr, short lsb, const char 
*str);
 void arm64_force_sig_info(struct siginfo *info, const char *str);
 
 /*
diff --git a/arch/arm64/kernel/traps.c b/arch/arm64/kernel/traps.c
index 37a3309863e0..baa96dfffeec 100644
--- a/arch/arm64/kernel/traps.c
+++ b/arch/arm64/kernel/traps.c
@@ -255,6 +255,13 @@ void arm64_force_sig_fault(int signo, int code, void 
__user *addr,
        force_sig_fault(signo, code, addr, current);
 }
 
+void arm64_force_sig_mceerr(int code, void __user *addr, short lsb,
+                           const char *str)
+{
+       arm64_show_signal(SIGBUS, str);
+       force_sig_mceerr(code, addr, lsb, current);
+}
+
 void arm64_force_sig_info(struct siginfo *info, const char *str)
 {
        arm64_show_signal(info->si_signo, str);
diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c
index 66c295019a9a..f0ccb209d181 100644
--- a/arch/arm64/mm/fault.c
+++ b/arch/arm64/mm/fault.c
@@ -422,7 +422,6 @@ static int __kprobes do_page_fault(unsigned long addr, 
unsigned int esr,
        const struct fault_info *inf;
        struct task_struct *tsk;
        struct mm_struct *mm;
-       struct siginfo si;
        vm_fault_t fault, major = 0;
        unsigned long vm_flags = VM_READ | VM_WRITE;
        unsigned int mm_flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE;
@@ -574,12 +573,8 @@ static int __kprobes do_page_fault(unsigned long addr, 
unsigned int esr,
                if (fault & VM_FAULT_HWPOISON_LARGE)
                        lsb = hstate_index_to_shift(VM_FAULT_GET_HINDEX(fault));
 
-               clear_siginfo(&si);
-               si.si_signo     = SIGBUS;
-               si.si_code      = BUS_MCEERR_AR;
-               si.si_addr = (void __user *)addr;
-               si.si_addr_lsb  = lsb;
-               arm64_force_sig_info(&si, inf->name);
+               arm64_force_sig_mceerr(BUS_MCEERR_AR, (void __user *)addr, lsb,
+                                      inf->name);
        } else {
                /*
                 * Something tried to access memory that isn't in our memory
-- 
2.17.1