Re: + sysctl-add-proc_dointvec_unsigned-handler.patch added to -mmtree

From: Alexey Dobriyan
Date: Tue Mar 08 2011 - 03:24:20 EST


On Tue, Mar 08, 2011 at 01:43:31PM +0800, Dave Young wrote:
> On Tue, Mar 8, 2011 at 1:15 PM, Dave Young <hidave.darkstar@xxxxxxxxx> wrote:
> > On Tue, Mar 8, 2011 at 7:26 AM, Alexey Dobriyan <adobriyan@xxxxxxxxx> wrote:
> >> On Mon, Mar 07, 2011 at 03:05:43PM -0800, akpm@xxxxxxxxxxxxxxxxxxxx wrote:
> >>> Add a proc_dointvec_unsigned() sysctl handler for positive value cases.
> >>
> >>> --- a/kernel/sysctl.c~sysctl-add-proc_dointvec_unsigned-handler
> >>> +++ a/kernel/sysctl.c
> >>
> >>> +int proc_dointvec_unsigned(struct ctl_table *table, int write,
> >>> +               void __user *buffer, size_t *lenp, loff_t *ppos)
> >>> +{
> >>> +     struct do_proc_dointvec_minmax_conv_param param = {
> >>> +             .min = &zero,
> >>> +     };
> >>> +     return do_proc_dointvec(table, write, buffer, lenp, ppos,
> >>> +                             do_proc_dointvec_minmax_conv, &param);
> >>> +}
> >>
> >> This silently ignored max value in .extra2 .
> >
> > Hi,
> >
> > Good cache, should set .max = NULL here
>
> Oh, c99 set default value to 0, isn't it?
>
> What do you mean silently ignore here?
>
> Let's see the code:
>
> if ((param->min && *param->min > val) ||
> (param->max && *param->max < val))
> return -EINVAL;
>
> There's no problem max == NULL

I mean literally "silently ignore".

Try
{
.name = "foo",
.data = &foo,
.maxlen = sizeof(foo),
.proc_handler = proc_dointvec_unsigned,
.extra2 = &_42,
}
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