[LTP] [PATCH] lib: tst_fd: Add kernel version check to memfd_secret

[nobuhiro1.iwamatsu@toshiba.co.jp]

Hi Petr,

> -----Original Message-----
> From: Petr Vorel <pvorel@suse.cz>
> Sent: Friday, June 21, 2024 8:09 PM
> To: iwamatsu nobuhiro(岩松 信洋 ○ＤＩＴＣ□ＤＩＴ○ＯＳＴ)
> <nobuhiro1.iwamatsu@toshiba.co.jp>
> Cc: ltp@lists.linux.it; Cyril Hrubis <chrubis@suse.cz>
> Subject: Re: [LTP] [PATCH] lib: tst_fd: Add kernel version check to
> memfd_secret
> 
> Hi Nobuhiro,
> 
> > memfd_secret is a syscall added since 5.14. On earlier kernels, tests
> > such as accept03, readahead01 and splice07 that use memfd_secret fail.
> > This adds a kernel version check to the tst_fd library when running
> > tests using memfd_secret.
> 
> Cyril's suggestion to add fallback definitions sounds to me as a good idea:
> 
> https://lore.kernel.org/ltp/ZnVCcU6jOU98DYek@yuki/
> 
> 	I guess that the best fix is to add fallback definitions for
> 	memfd_secret into include/lapi/syscalls/*.in files. That way we
> should
> 	get -1 and EINVAL properly even when kernel does not support the
> 	syscall.
> 
> Could you please try that first?

OK, I will create a v2 patch based on that suggestion.

> 
> Kind regards,
> Petr

Best regards,
  Nobuhiro