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    Subject[PATCH] x86 ptrace: fix PTRACE_GETFPXREGS error
    Date
    ptrace has always returned only -EIO for all failures to access
    registers. The user_regset calls are allowed to return a more
    meaningful variety of errors. The REGSET_XFP calls use -ENODEV
    for !cpu_has_fxsr hardware. Make ptrace return the traditional
    -EIO instead of the error code from the user_regset call.

    Signed-off-by: Roland McGrath <roland@redhat.com>
    ---
    arch/x86/kernel/ptrace.c | 4 ++--
    1 files changed, 2 insertions(+), 2 deletions(-)

    diff --git a/arch/x86/kernel/ptrace.c b/arch/x86/kernel/ptrace.c
    index a7835f2..77040b6 100644
    --- a/arch/x86/kernel/ptrace.c
    +++ b/arch/x86/kernel/ptrace.c
    @@ -943,13 +943,13 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
    return copy_regset_to_user(child, &user_x86_32_view,
    REGSET_XFP,
    0, sizeof(struct user_fxsr_struct),
    - datap);
    + datap) ? -EIO : 0;

    case PTRACE_SETFPXREGS: /* Set the child extended FPU state. */
    return copy_regset_from_user(child, &user_x86_32_view,
    REGSET_XFP,
    0, sizeof(struct user_fxsr_struct),
    - datap);
    + datap) ? -EIO : 0;
    #endif

    #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION

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