lib/bpf: fix clang build warnings for aarch64
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Commit Message
Couple of warnings will block build when warnings been treated as errors.
Clang version 8.0 was used.
Warning messages during build:
../lib/librte_bpf/bpf_jit_arm64.c:1438:26: warning: incompatible pointer
types passing 'uint32_t *' (aka 'unsigned int *') to parameter of type
'char *' [-Wincompatible-pointer-types]
__builtin___clear_cache(ctx.ins, ctx.ins + ctx.idx);
^~~~~~~
../lib/librte_bpf/bpf_jit_arm64.c:1438:35: warning: incompatible pointer
types passing 'uint32_t *' (aka 'unsigned int *') to parameter of type
'char *' [-Wincompatible-pointer-types]
__builtin___clear_cache(ctx.ins, ctx.ins + ctx.idx);
^~~~~~~~~~~~~~~~~
Fixes: f3e516772464 ("bpf/arm: add prologue and epilogue")
Cc: stable@dpdk.org
Signed-off-by: Ruifeng Wang <ruifeng.wang@arm.com>
Reviewed-by: Phil Yang <phil.yang@arm.com>
Reviewed-by: Gavin Hu <gavin.hu@arm.com>
---
lib/librte_bpf/bpf_jit_arm64.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
Comments
On Fri, Nov 15, 2019 at 8:48 AM Ruifeng Wang <ruifeng.wang@arm.com> wrote:
>
> Couple of warnings will block build when warnings been treated as errors.
> Clang version 8.0 was used.
>
> Warning messages during build:
> ../lib/librte_bpf/bpf_jit_arm64.c:1438:26: warning: incompatible pointer
> types passing 'uint32_t *' (aka 'unsigned int *') to parameter of type
> 'char *' [-Wincompatible-pointer-types]
> __builtin___clear_cache(ctx.ins, ctx.ins + ctx.idx);
> ^~~~~~~
> ../lib/librte_bpf/bpf_jit_arm64.c:1438:35: warning: incompatible pointer
> types passing 'uint32_t *' (aka 'unsigned int *') to parameter of type
> 'char *' [-Wincompatible-pointer-types]
> __builtin___clear_cache(ctx.ins, ctx.ins + ctx.idx);
> ^~~~~~~~~~~~~~~~~
>
> Fixes: f3e516772464 ("bpf/arm: add prologue and epilogue")
> Cc: stable@dpdk.org
No need to CC stable as this has been added in this release.
Is clang prototype for __builtin___clear_cache() different? If so,
update the git commit for the reason for the failure.
in gcc[1], it is void *.
[1]
void __builtin___clear_cache (void *begin, void *end)
>
> Signed-off-by: Ruifeng Wang <ruifeng.wang@arm.com>
> Reviewed-by: Phil Yang <phil.yang@arm.com>
> Reviewed-by: Gavin Hu <gavin.hu@arm.com>
@@ -1435,7 +1435,7 @@ bpf_jit_arm64(struct rte_bpf *bpf)
}
/* Flush the icache */
- __builtin___clear_cache(ctx.ins, ctx.ins + ctx.idx);
+ __builtin___clear_cache((char *)ctx.ins, (char *)(ctx.ins + ctx.idx));
bpf->jit.func = (void *)ctx.ins;
bpf->jit.sz = size;