linux-kernel - Re: linux-next: manual merge of the net-next tree with the bpf tree

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Date:   Thu, 26 Jul 2018 08:32:07 -0700
From:   Martin KaFai Lau <kafai@...com>
To:     Stephen Rothwell <sfr@...b.auug.org.au>
CC:     David Miller <davem@...emloft.net>,
        Networking <netdev@...r.kernel.org>,
        Linux-Next Mailing List <linux-next@...r.kernel.org>,
        "Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>,
        Okash Khawaja <osk@...com>,
        "Daniel Borkmann" <daniel@...earbox.net>,
        Alexei Starovoitov <ast@...nel.org>
Subject: Re: linux-next: manual merge of the net-next tree with the bpf tree

On Thu, Jul 26, 2018 at 11:19:16AM +1000, Stephen Rothwell wrote:
> Hi all,
> 
> Today's linux-next merge of the net-next tree got conflicts in:
> 
>   tools/lib/bpf/btf.c
>   tools/lib/bpf/btf.h
> 
> between commits:
> 
>   5b891af7fca1 ("bpf: Replace [u]int32_t and [u]int64_t in libbpf")
>   38d5d3b3d5db ("bpf: Introduce BPF_ANNOTATE_KV_PAIR")
> 
> from the bpf tree and commit:
> 
>   92b57121ca79 ("bpf: btf: export btf types and name by offset from lib")
> 
> from the net-next tree.
> 
> I fixed it up (see below) and can carry the fix as necessary.  This
The fix LGTM. Thanks!

> is now fixed as far as linux-next is concerned, but any non trivial
> conflicts should be mentioned to your upstream maintainer when your tree
> is submitted for merging.  You may also want to consider cooperating
> with the maintainer of the conflicting tree to minimise any particularly
> complex conflicts.
> 
> -- 
> Cheers,
> Stephen Rothwell
> 
> diff --cc tools/lib/bpf/btf.c
> index 2d270c560df3,03161be094b4..000000000000
> --- a/tools/lib/bpf/btf.c
> +++ b/tools/lib/bpf/btf.c
> @@@ -269,9 -259,29 +266,29 @@@ __s64 btf__resolve_size(const struct bt
>   	return nelems * size;
>   }
>   
> + int btf__resolve_type(const struct btf *btf, __u32 type_id)
> + {
> + 	const struct btf_type *t;
> + 	int depth = 0;
> + 
> + 	t = btf__type_by_id(btf, type_id);
> + 	while (depth < MAX_RESOLVE_DEPTH &&
> + 	       !btf_type_is_void_or_null(t) &&
> + 	       IS_MODIFIER(BTF_INFO_KIND(t->info))) {
> + 		type_id = t->type;
> + 		t = btf__type_by_id(btf, type_id);
> + 		depth++;
> + 	}
> + 
> + 	if (depth == MAX_RESOLVE_DEPTH || btf_type_is_void_or_null(t))
> + 		return -EINVAL;
> + 
> + 	return type_id;
> + }
> + 
>  -int32_t btf__find_by_name(const struct btf *btf, const char *type_name)
>  +__s32 btf__find_by_name(const struct btf *btf, const char *type_name)
>   {
>  -	uint32_t i;
>  +	__u32 i;
>   
>   	if (!strcmp(type_name, "void"))
>   		return 0;
> @@@ -368,3 -379,20 +385,11 @@@ int btf__fd(const struct btf *btf
>   {
>   	return btf->fd;
>   }
> + 
> + const char *btf__name_by_offset(const struct btf *btf, __u32 offset)
> + {
> + 	if (offset < btf->hdr->str_len)
> + 		return &btf->strings[offset];
> + 	else
> + 		return NULL;
> + }
>  -
>  -const struct btf_type *btf__type_by_id(const struct btf *btf,
>  -				       __u32 type_id)
>  -{
>  -	if (type_id > btf->nr_types)
>  -		return NULL;
>  -
>  -	return btf->types[type_id];
>  -}
> diff --cc tools/lib/bpf/btf.h
> index e2a09a155f84,24f361d99a5e..000000000000
> --- a/tools/lib/bpf/btf.h
> +++ b/tools/lib/bpf/btf.h
> @@@ -15,10 -14,12 +15,12 @@@ typedef int (*btf_print_fn_t)(const cha
>   	__attribute__((format(printf, 1, 2)));
>   
>   void btf__free(struct btf *btf);
>  -struct btf *btf__new(uint8_t *data, uint32_t size, btf_print_fn_t err_log);
>  -int32_t btf__find_by_name(const struct btf *btf, const char *type_name);
>  -int64_t btf__resolve_size(const struct btf *btf, uint32_t type_id);
>  +struct btf *btf__new(__u8 *data, __u32 size, btf_print_fn_t err_log);
>  +__s32 btf__find_by_name(const struct btf *btf, const char *type_name);
> - const struct btf_type *btf__type_by_id(const struct btf *btf, __u32 id);
>  +__s64 btf__resolve_size(const struct btf *btf, __u32 type_id);
> + int btf__resolve_type(const struct btf *btf, __u32 type_id);
>   int btf__fd(const struct btf *btf);
> + const char *btf__name_by_offset(const struct btf *btf, __u32 offset);
> + const struct btf_type *btf__type_by_id(const struct btf *btf, __u32 type_id);
>   
>   #endif