2019-06-25 20:28:11

by Ivan Khoronzhuk

Subject: [PATCH bpf-next] libbpf: fix max() type mismatch for 32bit

It fixes build error for 32bit caused by type mismatch
size_t/unsigned long.

Signed-off-by: Ivan Khoronzhuk <[email protected]>
---
tools/lib/bpf/libbpf.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
index 68f45a96769f..5186b7710430 100644
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c
@@ -778,7 +778,7 @@ static struct bpf_map *bpf_object__add_map(struct bpf_object *obj)
if (obj->nr_maps < obj->maps_cap)
return &obj->maps[obj->nr_maps++];

- new_cap = max(4ul, obj->maps_cap * 3 / 2);
+ new_cap = max((size_t)4, obj->maps_cap * 3 / 2);
new_maps = realloc(obj->maps, new_cap * sizeof(*obj->maps));
if (!new_maps) {
pr_warning("alloc maps for object failed\n");
--
2.17.1

2019-06-25 21:04:32

by Song Liu

Subject: Re: [PATCH bpf-next] libbpf: fix max() type mismatch for 32bit

On Tue, Jun 25, 2019 at 1:28 PM Ivan Khoronzhuk
<[email protected]> wrote:
>
> It fixes build error for 32bit caused by type mismatch
> size_t/unsigned long.
>
> Signed-off-by: Ivan Khoronzhuk <[email protected]>

Acked-by: Song Liu <[email protected]>

> ---
> tools/lib/bpf/libbpf.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
> index 68f45a96769f..5186b7710430 100644
> --- a/tools/lib/bpf/libbpf.c
> +++ b/tools/lib/bpf/libbpf.c
> @@ -778,7 +778,7 @@ static struct bpf_map *bpf_object__add_map(struct bpf_object *obj)
> if (obj->nr_maps < obj->maps_cap)
> return &obj->maps[obj->nr_maps++];
>
> - new_cap = max(4ul, obj->maps_cap * 3 / 2);
> + new_cap = max((size_t)4, obj->maps_cap * 3 / 2);
> new_maps = realloc(obj->maps, new_cap * sizeof(*obj->maps));
> if (!new_maps) {
> pr_warning("alloc maps for object failed\n");
> --
> 2.17.1
>

2019-06-26 04:59:03

by Andrii Nakryiko

Subject: Re: [PATCH bpf-next] libbpf: fix max() type mismatch for 32bit

On Tue, Jun 25, 2019 at 1:28 PM Ivan Khoronzhuk
<[email protected]> wrote:
>
> It fixes build error for 32bit caused by type mismatch
> size_t/unsigned long.
>
> Signed-off-by: Ivan Khoronzhuk <[email protected]>
> ---

Sorry, forgot to mention, this should probably have

Fixes: bf82927125dd ("libbpf: refactor map initialization")

With that:

Acked-by: Andrii Nakryiko <[email protected]>

> tools/lib/bpf/libbpf.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
> index 68f45a96769f..5186b7710430 100644
> --- a/tools/lib/bpf/libbpf.c
> +++ b/tools/lib/bpf/libbpf.c
> @@ -778,7 +778,7 @@ static struct bpf_map *bpf_object__add_map(struct bpf_object *obj)
> if (obj->nr_maps < obj->maps_cap)
> return &obj->maps[obj->nr_maps++];
>
> - new_cap = max(4ul, obj->maps_cap * 3 / 2);
> + new_cap = max((size_t)4, obj->maps_cap * 3 / 2);
> new_maps = realloc(obj->maps, new_cap * sizeof(*obj->maps));
> if (!new_maps) {
> pr_warning("alloc maps for object failed\n");
> --
> 2.17.1
>