tree 733a8133eb8e13ba7618d8f4f404b413fe8b96ac
parent c7ac334f274084684d34f7befdd44fbf07c503c4
author Archer Yan <ayan@wavecomp.com> 1552015759 +0000
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1553663582 +0900

MIPS: Fix kernel crash for R6 in jump label branch function

commit 47c25036b60f27b86ab44b66a8861bcf81cde39b upstream.

Insert Branch instruction instead of NOP to make sure assembler don't
patch code in forbidden slot. In jump label function, it might
be possible to patch Control Transfer Instructions(CTIs) into
forbidden slot, which will generate Reserved Instruction exception
in MIPS release 6.

Signed-off-by: Archer Yan <ayan@wavecomp.com>
Reviewed-by: Paul Burton <paul.burton@mips.com>
[paul.burton@mips.com:
  - Add MIPS prefix to subject.
  - Mark for stable from v4.0, which introduced r6 support, onwards.]
Signed-off-by: Paul Burton <paul.burton@mips.com>
Cc: linux-mips@vger.kernel.org
Cc: stable@vger.kernel.org # v4.0+
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>