Re: [PATCH v16 10/11] of: fdt: Add memory for devices by DT property "linux,usable-memory-range"

[Rob Herring <robh@kernel.org>]

On Wed, Dec 8, 2021 at 7:59 PM Leizhen (ThunderTown)
<thunder.leizhen@huawei.com> wrote:
>
>
>
> On 2021/12/1 10:55, Leizhen (ThunderTown) wrote:
> >>> +   }
> >>>
> >>> -   memblock_cap_memory_range(cap_mem_addr, cap_mem_size);
> >>> +   memblock_cap_memory_range(rgn[0].base, rgn[0].size);
> >>> +   for (i = 1; i < MAX_USABLE_RANGES && rgn[i].size; i++)
> >> s/ &&/,/
>
> Hi Rob:
>   I want to keep "&&" unchanged, do you mind? I'm going to post an
> updated version tomorrow, hopefully the last.

Looks like that was obviously correct, so no objections.

Rob

>
> > Hi Rob:
> >
> > The comma operator may not be suitable for logical judgment. The logical judgment
> > before commas (,) is ignored.
> >
> > Here's my test：
> >
> > C code：
> > int main()
> > {
> >         int i, j;
> >
> >         printf("&&:\n");
> >         for (i = 0, j = 0; i < 2 && j < 3; i++, j++)
> >                 printf("i=%d, j=%d\n", i, j);
> >
> >         printf("\ncomma:\n");
> >         for (i = 0, j = 0; i < 2, j < 3; i++, j++)    //(i < 2） before comma is ignored
> >                 printf("i=%d, j=%d\n", i, j);
> >
> >         return 0;
> > }
> >
> > Output：
> > &&:
> > i=0, j=0
> > i=1, j=1
> >
> > comma:
> > i=0, j=0
> > i=1, j=1
> > i=2, j=2
> >
> >