[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>

diff --git a/arch/sparc64/mm/fault.c b/arch/sparc64/mm/fault.c
index e2027f27c0fe73f2f43546aa838577e86fc6e3ba..918363360280c35af390594811e20c2ccba06bc9 100644 (file)
--- 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;