Re: [PATCH 4/6] tools/gup_benchmark: Allow user specified file

[Andrew Morton]

On Wed, 10 Oct 2018 13:56:03 -0600 Keith Busch <keith.bu...@intel.com> wrote:

> This patch allows a user to specify a file to map by adding a new option,
> '-f', providing a means to test various file backings.
> 
> If not specified, the benchmark will use a private mapping of /dev/zero,
> which produces an anonymous mapping as before.
> 
> ...
>
> --- a/tools/testing/selftests/vm/gup_benchmark.c
> +++ b/tools/testing/selftests/vm/gup_benchmark.c
>
> ...
>
> @@ -61,11 +62,18 @@ int main(int argc, char **argv)
>               case 'w':
>                       write = 1;
>                       break;
> +             case 'f':
> +                     file = optarg;
> +                     break;
>               default:
>                       return -1;
>               }
>       }
>  
> +     filed = open(file, O_RDWR|O_CREAT);
> +     if (filed < 0)
> +             perror("open"), exit(filed);

Ick.  Like this, please:

--- 
a/tools/testing/selftests/vm/gup_benchmark.c~tools-gup_benchmark-allow-user-specified-file-fix
+++ a/tools/testing/selftests/vm/gup_benchmark.c
@@ -71,8 +71,10 @@ int main(int argc, char **argv)
        }
 
        filed = open(file, O_RDWR|O_CREAT);
-       if (filed < 0)
-               perror("open"), exit(filed);
+       if (filed < 0) {
+               perror("open");
+               exit(filed);
+       }
 
        gup.nr_pages_per_call = nr_pages;
        gup.flags = write;