* [PATCH] include/linux/bpf.h - fix missing prototype warnings...
@ 2019-01-29 6:04 valdis.kletnieks
2019-01-29 7:07 ` Song Liu
2019-01-31 9:39 ` Daniel Borkmann
0 siblings, 2 replies; 3+ messages in thread
From: valdis.kletnieks @ 2019-01-29 6:04 UTC (permalink / raw)
To: Alexei Starovoitov, Daniel Borkmann; +Cc: netdev, linux-kernel
Compiling with W=1 generates warnings:
CC kernel/bpf/core.o
kernel/bpf/core.c:721:12: warning: no previous prototype for ?bpf_jit_alloc_exec_limit? [-Wmissing-prototypes]
721 | u64 __weak bpf_jit_alloc_exec_limit(void)
| ^~~~~~~~~~~~~~~~~~~~~~~~
kernel/bpf/core.c:757:14: warning: no previous prototype for ?bpf_jit_alloc_exec? [-Wmissing-prototypes]
757 | void *__weak bpf_jit_alloc_exec(unsigned long size)
| ^~~~~~~~~~~~~~~~~~
kernel/bpf/core.c:762:13: warning: no previous prototype for ?bpf_jit_free_exec? [-Wmissing-prototypes]
762 | void __weak bpf_jit_free_exec(void *addr)
| ^~~~~~~~~~~~~~~~~
All three are weak functions that archs can override, although none do so
currently. Provide prototypes for when a new arch provides its own.
Signed-off-by: Valdis Kletnieks <valdis.kletnieks@vt.edu>
diff --git a/include/linux/bpf.h b/include/linux/bpf.h
index 3851529062ec..99e55313123f 100644
--- a/include/linux/bpf.h
+++ b/include/linux/bpf.h
@@ -472,6 +472,10 @@ _out: \
#define BPF_PROG_RUN_ARRAY_CHECK(array, ctx, func) \
__BPF_PROG_RUN_ARRAY(array, ctx, func, true)
+u64 __weak bpf_jit_alloc_exec_limit(void);
+void *__weak bpf_jit_alloc_exec(unsigned long size);
+void __weak bpf_jit_free_exec(void *addr);
+
#ifdef CONFIG_BPF_SYSCALL
DECLARE_PER_CPU(int, bpf_prog_active);
^ permalink raw reply related [flat|nested] 3+ messages in thread* Re: [PATCH] include/linux/bpf.h - fix missing prototype warnings...
2019-01-29 6:04 [PATCH] include/linux/bpf.h - fix missing prototype warnings valdis.kletnieks
@ 2019-01-29 7:07 ` Song Liu
2019-01-31 9:39 ` Daniel Borkmann
1 sibling, 0 replies; 3+ messages in thread
From: Song Liu @ 2019-01-29 7:07 UTC (permalink / raw)
To: Valdis Kletnieks
Cc: Alexei Starovoitov, Daniel Borkmann, Networking, open list
On Mon, Jan 28, 2019 at 10:05 PM <valdis.kletnieks@vt.edu> wrote:
>
> Compiling with W=1 generates warnings:
>
> CC kernel/bpf/core.o
> kernel/bpf/core.c:721:12: warning: no previous prototype for ?bpf_jit_alloc_exec_limit? [-Wmissing-prototypes]
> 721 | u64 __weak bpf_jit_alloc_exec_limit(void)
> | ^~~~~~~~~~~~~~~~~~~~~~~~
> kernel/bpf/core.c:757:14: warning: no previous prototype for ?bpf_jit_alloc_exec? [-Wmissing-prototypes]
> 757 | void *__weak bpf_jit_alloc_exec(unsigned long size)
> | ^~~~~~~~~~~~~~~~~~
> kernel/bpf/core.c:762:13: warning: no previous prototype for ?bpf_jit_free_exec? [-Wmissing-prototypes]
> 762 | void __weak bpf_jit_free_exec(void *addr)
> | ^~~~~~~~~~~~~~~~~
>
> All three are weak functions that archs can override, although none do so
> currently. Provide prototypes for when a new arch provides its own.
>
> Signed-off-by: Valdis Kletnieks <valdis.kletnieks@vt.edu>
Acked-by: Song Liu <songliubraving@fb.com>
>
> diff --git a/include/linux/bpf.h b/include/linux/bpf.h
> index 3851529062ec..99e55313123f 100644
> --- a/include/linux/bpf.h
> +++ b/include/linux/bpf.h
> @@ -472,6 +472,10 @@ _out: \
> #define BPF_PROG_RUN_ARRAY_CHECK(array, ctx, func) \
> __BPF_PROG_RUN_ARRAY(array, ctx, func, true)
>
> +u64 __weak bpf_jit_alloc_exec_limit(void);
> +void *__weak bpf_jit_alloc_exec(unsigned long size);
> +void __weak bpf_jit_free_exec(void *addr);
> +
> #ifdef CONFIG_BPF_SYSCALL
> DECLARE_PER_CPU(int, bpf_prog_active);
>
>
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH] include/linux/bpf.h - fix missing prototype warnings...
2019-01-29 6:04 [PATCH] include/linux/bpf.h - fix missing prototype warnings valdis.kletnieks
2019-01-29 7:07 ` Song Liu
@ 2019-01-31 9:39 ` Daniel Borkmann
1 sibling, 0 replies; 3+ messages in thread
From: Daniel Borkmann @ 2019-01-31 9:39 UTC (permalink / raw)
To: valdis.kletnieks, Alexei Starovoitov; +Cc: netdev, linux-kernel
On 01/29/2019 07:04 AM, valdis.kletnieks@vt.edu wrote:
> Compiling with W=1 generates warnings:
>
> CC kernel/bpf/core.o
> kernel/bpf/core.c:721:12: warning: no previous prototype for ?bpf_jit_alloc_exec_limit? [-Wmissing-prototypes]
> 721 | u64 __weak bpf_jit_alloc_exec_limit(void)
> | ^~~~~~~~~~~~~~~~~~~~~~~~
> kernel/bpf/core.c:757:14: warning: no previous prototype for ?bpf_jit_alloc_exec? [-Wmissing-prototypes]
> 757 | void *__weak bpf_jit_alloc_exec(unsigned long size)
> | ^~~~~~~~~~~~~~~~~~
> kernel/bpf/core.c:762:13: warning: no previous prototype for ?bpf_jit_free_exec? [-Wmissing-prototypes]
> 762 | void __weak bpf_jit_free_exec(void *addr)
> | ^~~~~~~~~~~~~~~~~
>
> All three are weak functions that archs can override, although none do so
> currently. Provide prototypes for when a new arch provides its own.
>
> Signed-off-by: Valdis Kletnieks <valdis.kletnieks@vt.edu>
Applied all 3 to bpf-next, thanks Valdis!
> diff --git a/include/linux/bpf.h b/include/linux/bpf.h
> index 3851529062ec..99e55313123f 100644
> --- a/include/linux/bpf.h
> +++ b/include/linux/bpf.h
> @@ -472,6 +472,10 @@ _out: \
> #define BPF_PROG_RUN_ARRAY_CHECK(array, ctx, func) \
> __BPF_PROG_RUN_ARRAY(array, ctx, func, true)
>
> +u64 __weak bpf_jit_alloc_exec_limit(void);
> +void *__weak bpf_jit_alloc_exec(unsigned long size);
> +void __weak bpf_jit_free_exec(void *addr);
> +
(I moved these to include/linux/filter.h while applying where we have all the
other prototypes from JIT core already.)
> #ifdef CONFIG_BPF_SYSCALL
> DECLARE_PER_CPU(int, bpf_prog_active);
>
>
^ permalink raw reply [flat|nested] 3+ messages in thread
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2019-01-29 7:07 ` Song Liu
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