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Commit 73c50a27 authored by David S. Miller's avatar David S. Miller
Browse files

[SPARC64]: Document the instruction checks we do in do_sparc64_fault(). 



Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 6f25f398

arch/sparc64/mm/fault.c

+5 −1
Original line number Diff line number Diff line
@@ -327,8 +327,12 @@ asmlinkage void __kprobes do_sparc64_fault(struct pt_regs *regs) 
		insn = get_fault_insn(regs, 0);

		if (!insn)

			goto continue_fault;

		/* All loads, stores and atomics have bits 30 and 31 both set

		 * in the instruction.  Bit 21 is set in all stores, but we

		 * have to avoid prefetches which also have bit 21 set.

		 */

		if ((insn & 0xc0200000) == 0xc0200000 &&

		    (insn & 0x1780000) != 0x1680000) {

		    (insn & 0x01780000) != 0x01680000) {

			/* Don't bother updating thread struct value,

			 * because update_mmu_cache only cares which tlb

			 * the access came from.