linux-kernel - Re: [PATCH V2 2/2] kexec: split kexec

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Date:	Tue, 21 Jul 2015 09:03:08 -0400
From:	Vivek Goyal <vgoyal@...hat.com>
To:	dyoung@...hat.com
Cc:	linux-kernel@...r.kernel.org, kexec@...ts.infradead.org,
	ebiederm@...ssion.com, ptesarik@...e.cz, tytso@....edu,
	jwboyer@...oraproject.org, dhowells@...hat.com,
	akpm@...ux-foundation.org, geert@...ux-m68k.org
Subject: Re: [PATCH V2 2/2] kexec: split kexec_load syscall from kexec core
 code

On Mon, Jul 20, 2015 at 04:37:15PM +0800, dyoung@...hat.com wrote:
> Now there's two kexec load syscall, one is kexec_load another is
> kexec_file_load, kexec_file_load has been splited as kernel/kexec_file.c.
> In this patch I split kexec_load syscall code to kernel/kexec.c.

Hi Dave,

Nice work. Thanks for doing this. I have couple of minor comments.

- We might have to audit kernel/kexec_core.c. I think there are some
  functions in there which are used by only old syscall and not the new
  one. All that code should be in kernel/kexec.c. Only the code which is
  shared between two syscalls should be in kernel/kexec_core.c.
  
  For example, I think kimage_alloc_init() is used by old syscall only.
  New syscall uses kimage_file_alloc_init().

[..]
> --- linux.orig/include/linux/kexec.h
> +++ linux/include/linux/kexec.h
> @@ -16,7 +16,7 @@
>  
>  #include <uapi/linux/kexec.h>
>  
> -#ifdef CONFIG_KEXEC
> +#ifdef CONFIG_KEXEC_CORE
>  #include <linux/list.h>
>  #include <linux/linkage.h>
>  #include <linux/compat.h>
> @@ -318,12 +318,18 @@ int crash_shrink_memory(unsigned long ne
>  size_t crash_get_memory_size(void);
>  void crash_free_reserved_phys_range(unsigned long begin, unsigned long end);
>  
> -#else /* !CONFIG_KEXEC */
> +#ifdef CONFIG_KEXEC
> +int kimage_alloc_init(struct kimage **rimage, unsigned long entry,
> +			     unsigned long nr_segments,
> +			     struct kexec_segment __user *segments,
> +			     unsigned long flags);
> +#endif

I am wondering why this needs to be in kexec.h. Who needs this? Even if
somebody needs this, this should probably be outside of KEXEC_CORE.

#ifdef CONFIG_KEXEC
int kimage_alloc_init(struct kimage **rimage, unsigned long entry,....
#else
#endif

#ifdef CONFIG_KEXEC_CORE
.
..

Thanks
Vivek
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