linux-kernel - Re: [PATCH 06/13] kexec: New syscall kexec_file

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Date:	Thu, 5 Jun 2014 17:56:03 +0800
From:	WANG Chao <chaowang@...hat.com>
To:	Vivek Goyal <vgoyal@...hat.com>
Cc:	linux-kernel@...r.kernel.org, kexec@...ts.infradead.org,
	ebiederm@...ssion.com, hpa@...or.com, mjg59@...f.ucam.org,
	greg@...ah.com, bp@...en8.de, jkosina@...e.cz, dyoung@...hat.com,
	bhe@...hat.com, akpm@...ux-foundation.org
Subject: Re: [PATCH 06/13] kexec: New syscall kexec_file_load() declaration

On 06/03/14 at 09:06am, Vivek Goyal wrote:
> This is the new syscall kexec_file_load() declaration/interface. I have
> reserved the syscall number only for x86_64 so far. Other architectures
> (including i386) can reserve syscall number when they enable the support
> for this new syscall.

Hi, Vivek

I have a comment below about the kexec_file_load args.

[..]
> diff --git a/kernel/kexec.c b/kernel/kexec.c
> index c435c5f..a3044e6 100644
> --- a/kernel/kexec.c
> +++ b/kernel/kexec.c
> @@ -1098,6 +1098,13 @@ COMPAT_SYSCALL_DEFINE4(kexec_load, compat_ulong_t, entry,
>  }
>  #endif
>  
> +SYSCALL_DEFINE5(kexec_file_load, int, kernel_fd, int, initrd_fd,
> +		const char __user *, cmdline_ptr, unsigned long,
> +		cmdline_len, unsigned long, flags)

initrd is optional for system boot.

How about using int *kernel_fd and int *initrd_fd as the argument? Then
if I don't need initrd, in userspace I can do this:

kexec_file_load(&kernel_fd, NULL, ...)

And even you can remove KEXEC_FILE_UNLOAD flag, because you could tell
that one wants to unload if the following is invoked:

kexec_file_load(NULL, NULL, ...)

Thanks
WANG Chao
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