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    Subject[PATCH 4.19 58/74] arm64: compat: Allow single-byte watchpoints on all addresses
    Date
    From: Will Deacon <will@kernel.org>

    commit 849adec41203ac5837c40c2d7e08490ffdef3c2c upstream.

    Commit d968d2b801d8 ("ARM: 7497/1: hw_breakpoint: allow single-byte
    watchpoints on all addresses") changed the validation requirements for
    hardware watchpoints on arch/arm/. Update our compat layer to implement
    the same relaxation.

    Cc: <stable@vger.kernel.org>
    Signed-off-by: Will Deacon <will@kernel.org>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    arch/arm64/kernel/hw_breakpoint.c | 7 ++++---
    1 file changed, 4 insertions(+), 3 deletions(-)

    --- a/arch/arm64/kernel/hw_breakpoint.c
    +++ b/arch/arm64/kernel/hw_breakpoint.c
    @@ -547,13 +547,14 @@ int hw_breakpoint_arch_parse(struct perf
    /* Aligned */
    break;
    case 1:
    - /* Allow single byte watchpoint. */
    - if (hw->ctrl.len == ARM_BREAKPOINT_LEN_1)
    - break;
    case 2:
    /* Allow halfword watchpoints and breakpoints. */
    if (hw->ctrl.len == ARM_BREAKPOINT_LEN_2)
    break;
    + case 3:
    + /* Allow single byte watchpoint. */
    + if (hw->ctrl.len == ARM_BREAKPOINT_LEN_1)
    + break;
    default:
    return -EINVAL;
    }

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