Re: [Xen-devel] [PATCH LIVEPATCH-BUILD-TOOLS 2/2] Remove section alignment requirement

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Fri, Jun 09, 2017 at 05:03:36PM +0100, Ross Lagerwall wrote:
> Remove the requirement that section twins have the same alignment. The
> section alignment of the patched section is respected by the loader in
> Xen so it shouldn't matter if the original section alignment was
> different.

Why would we have different section aligment for the same twins?

I understand the change here - if for example the original code
had:

 .rodata.str.1

[I think I got the section name right - that should be a string
generated with 1 byte alignment, say 'a'].

But the new patch has a new one:

 .rodata.str.2

['a' -> 'ab']

Is that what we are fixing here?

Also CC-ing Sarah
> 
> Signed-off-by: Ross Lagerwall <ross.lagerwall@xxxxxxxxxx>
> ---
>  create-diff-object.c | 1 -
>  1 file changed, 1 deletion(-)
> 
> diff --git a/create-diff-object.c b/create-diff-object.c
> index ba19daf..82f777e 100644
> --- a/create-diff-object.c
> +++ b/create-diff-object.c
> @@ -754,7 +754,6 @@ static void kpatch_compare_correlated_section(struct 
> section *sec)
>       if (sec1->sh.sh_type != sec2->sh.sh_type ||
>           sec1->sh.sh_flags != sec2->sh.sh_flags ||
>           sec1->sh.sh_addr != sec2->sh.sh_addr ||
> -         sec1->sh.sh_addralign != sec2->sh.sh_addralign ||
>           sec1->sh.sh_entsize != sec2->sh.sh_entsize)
>               DIFF_FATAL("%s section header details differ", sec1->name);
>  
> -- 
> 2.9.4
> 

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