[SPARC64]: Loosen checks in exception table handling. (622eaec6) · Commits · 戴 / test

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 ("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>

arch/sparc64/mm/fault.c

+2 −10

Original line number	Diff line number	Diff line
		@@ -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;

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