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| author | Arnd Bergmann <arnd@arndb.de> | 2016-09-23 22:23:59 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2016-09-26 02:26:29 -0400 |
| commit | b47c62c5de2bc43a26bcaca8d7a93bf9dee66ffe (patch) | |
| tree | 2f55cb728bfb2cae2fd2143cddb3ccbbc5be7141 | |
| parent | e2072600a24161b7ddcfb26814f69f5fbc8ef85a (diff) | |
| download | linux-stable-b47c62c5de2bc43a26bcaca8d7a93bf9dee66ffe.tar.gz linux-stable-b47c62c5de2bc43a26bcaca8d7a93bf9dee66ffe.tar.bz2 linux-stable-b47c62c5de2bc43a26bcaca8d7a93bf9dee66ffe.zip | |
nfp: bpf: improve handling for disabled BPF syscall
I stumbled over a new warning during randconfig testing,
with CONFIG_BPF_SYSCALL disabled:
drivers/net/ethernet/netronome/nfp/nfp_net_offload.c: In function 'nfp_net_bpf_offload':
drivers/net/ethernet/netronome/nfp/nfp_net_offload.c:263:3: error: '*((void *)&res+4)' may be used uninitialized in this function [-Werror=maybe-uninitialized]
drivers/net/ethernet/netronome/nfp/nfp_net_offload.c:263:3: error: 'res.n_instr' may be used uninitialized in this function [-Werror=maybe-uninitialized]
As far as I can tell, this is a false positive caused by the compiler
getting confused about a function that is partially inlined, but it's
easy to avoid while improving the code:
The nfp_bpf_jit() stub helper for that configuration is unusual as it
is defined in a header file but not marked 'static inline'. By moving
the compile-time check into the caller using the IS_ENABLED() macro,
we can remove that stub and simplify the nfp_net_bpf_offload_prepare()
function enough to unconfuse the compiler.
Fixes: 7533fdc0f77f ("nfp: bpf: add hardware bpf offload")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | drivers/net/ethernet/netronome/nfp/nfp_bpf.h | 10 | ||||
| -rw-r--r-- | drivers/net/ethernet/netronome/nfp/nfp_net_offload.c | 3 |
2 files changed, 3 insertions, 10 deletions
diff --git a/drivers/net/ethernet/netronome/nfp/nfp_bpf.h b/drivers/net/ethernet/netronome/nfp/nfp_bpf.h index fc220cd04115..87aa8a3e9112 100644 --- a/drivers/net/ethernet/netronome/nfp/nfp_bpf.h +++ b/drivers/net/ethernet/netronome/nfp/nfp_bpf.h @@ -192,20 +192,10 @@ struct nfp_bpf_result { bool dense_mode; }; -#ifdef CONFIG_BPF_SYSCALL int nfp_bpf_jit(struct bpf_prog *filter, void *prog, enum nfp_bpf_action_type act, unsigned int prog_start, unsigned int prog_done, unsigned int prog_sz, struct nfp_bpf_result *res); -#else -int -nfp_bpf_jit(struct bpf_prog *filter, void *prog, enum nfp_bpf_action_type act, - unsigned int prog_start, unsigned int prog_done, - unsigned int prog_sz, struct nfp_bpf_result *res) -{ - return -ENOTSUPP; -} -#endif int nfp_prog_verify(struct nfp_prog *nfp_prog, struct bpf_prog *prog); diff --git a/drivers/net/ethernet/netronome/nfp/nfp_net_offload.c b/drivers/net/ethernet/netronome/nfp/nfp_net_offload.c index 43f42f842eda..8acfb631a0ea 100644 --- a/drivers/net/ethernet/netronome/nfp/nfp_net_offload.c +++ b/drivers/net/ethernet/netronome/nfp/nfp_net_offload.c @@ -148,6 +148,9 @@ nfp_net_bpf_offload_prepare(struct nfp_net *nn, unsigned int max_mtu; int ret; + if (!IS_ENABLED(CONFIG_BPF_SYSCALL)) + return -ENOTSUPP; + ret = nfp_net_bpf_get_act(nn, cls_bpf); if (ret < 0) return ret; |