Re: [PATCHv5 bpf] bpf: Move iterator functions into special init section

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On 11/10/20 11:35 AM, Jiri Olsa wrote:
On Mon, Nov 09, 2020 at 11:04:34PM +0100, Daniel Borkmann wrote:

SNIP

index 7b53cb3092ee..a7c71e3b5f9a 100644
--- a/include/linux/init.h
+++ b/include/linux/init.h
@@ -52,6 +52,7 @@
   #define __initconst	__section(".init.rodata")
   #define __exitdata	__section(".exit.data")
   #define __exit_call	__used __section(".exitcall.exit")
+#define __init_bpf_preserve_type __section(".init.bpf.preserve_type")

Small nit, why this detour via BPF_INIT define? Couldn't we just:

#ifdef CONFIG_DEBUG_INFO_BTF
#define __init_bpf_preserve_type   __section(".init.bpf.preserve_type")
#else
#define __init_bpf_preserve_type   __init
#endif

Also, the comment above the existing defines says '/* These are for everybody (although
not all archs will actually discard it in modules) */' ... We should probably not add
the __init_bpf_preserve_type right under this listing as-is in your patch, but instead
'separate' it by adding a small comment on top of its definition by explaining its
purpose more clearly for others.

ok, for some reason I thought I needed to add it to init.h,
but as it's bpf specific, perhaps we can omit init.h change
completely.. how about the change below?

Agree, that looks much better, thanks!



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