| From | Greg Kroah-Hartman <> | Subject | [ 14/50] ARC: Handle zero-overhead-loop in unaligned access handler | Date | Wed, 16 Oct 2013 10:45:00 -0700 |
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3.11-stable review patch. If anyone has any objections, please let me know.
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From: Mischa Jonker <mjonker@synopsys.com>
commit c11eb222fd7d4db91196121dbf854178505d2751 upstream.
If a load or store is the last instruction in a zero-overhead-loop, and it's misaligned, the loop would execute only once.
This fixes that problem.
Signed-off-by: Mischa Jonker <mjonker@synopsys.com> Signed-off-by: Vineet Gupta <vgupta@synopsys.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- arch/arc/kernel/unaligned.c | 6 ++++++ 1 file changed, 6 insertions(+)
--- a/arch/arc/kernel/unaligned.c +++ b/arch/arc/kernel/unaligned.c @@ -233,6 +233,12 @@ int misaligned_fixup(unsigned long addre regs->status32 &= ~STATUS_DE_MASK; } else { regs->ret += state.instr_len; + + /* handle zero-overhead-loop */ + if ((regs->ret == regs->lp_end) && (regs->lp_count)) { + regs->ret = regs->lp_start; + regs->lp_count--; + } } return 0;
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