Hi Tony, thanks a lot for the prompt answer ! On Wed May 7, 2025 at 10:39 PM CEST, Tony Ambardar wrote: > On Wed, May 07, 2025 at 10:02:51PM +0200, Alexis Lothoré wrote: >> Hello, [...] > Hi Alexis, > >> Am I missing some constraint or limitation that would prevent the case 2 >> function from being described with BTF info ? If not, any advice about how >> to debug this further ? >> > > I suspect this might be related to an issue I ran into where pahole may > mis-encode types larger than register-size [1]. Out of curiosity, could > you try rebuilding and using a pahole with my latest patch [2]? > > 1: https://lore.kernel.org/dwarves/20250410083359.198724-1-tony.ambardar@xxxxxxxxx/ > 2: https://lore.kernel.org/dwarves/20250502070318.1561924-1-tony.ambardar@xxxxxxxxx/ I gave a try to your patch on top of pahole 1.30, and indeed it seems that my issue is fixed with your solution. I now have some BTF info for my bpf_testmod_test_struct_arg_11 func: [...] [370] FUNC_PROTO '(anon)' ret_type_id=6 vlen=6 'a' type_id=10 'b' type_id=10 'c' type_id=10 'd' type_id=10 'e' type_id=5 'f' type_id=10 [371] FUNC 'bpf_testmod_test_struct_arg_11' type_id=370 linkage=static [...] I also did some quick tests around Alan's request in your series, I'll report to your series' thread. Thanks for the help ! Alexis > > Cheers, > Tony > >> Thanks, >> >> Alexis >> >> -- >> Alexis Lothoré, Bootlin >> Embedded Linux and Kernel engineering >> https://bootlin.com -- Alexis Lothoré, Bootlin Embedded Linux and Kernel engineering https://bootlin.com
