[SPARC64]: Loosen checks in exception table handling.

Some parts of the kernel now do things like do *_user() accesses while
set_fs(KERNEL_DS) that fault on purpose.

See, for example, the code added by changeset
a0c1e9073ef7428a14309cba010633a6cd6719ea ("futex: runtime enable pi
and robust functionality").

That trips up the ASI sanity checking we make in do_kernel_fault().

Just remove it for now.  Maybe we can add it back later with an added
conditional which looks at the current get_fs() value.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 10 deletions

diff --git a/arch/sparc64/mm/fault.c b/arch/sparc64/mm/fault.c
index e2027f27c0fe..918363360280 100644
--- a/arch/sparc64/mm/fault.c
+++ b/arch/sparc64/mm/fault.c
@@ -244,16 +244,8 @@ static void do_kernel_fault(struct pt_regs *regs, int si_code, int fault_code,
         if (regs->tstate & TSTATE_PRIV) {
                 const struct exception_table_entry *entry;
 
-                if (asi == ASI_P && (insn & 0xc0800000) == 0xc0800000) {
-                        if (insn & 0x2000)
-                                asi = (regs->tstate >> 24);
-                        else
-                                asi = (insn >> 5);
-                }
-        
-                /* Look in asi.h: All _S asis have LS bit set */
-                if ((asi & 0x1) &&
-                    (entry = search_exception_tables(regs->tpc))) {
+                entry = search_exception_tables(regs->tpc);
+                if (entry) {
                         regs->tpc = entry->fixup;
                         regs->tnpc = regs->tpc + 4;
                         return;