Re: [PATCH v5 17/28] xsplice: Add support for exception tables.

["Jan Beulich" <jbeulich@suse.com>]

>>> Konrad Rzeszutek Wilk <konrad@kernel.org> 04/06/16 4:42 PM >>>
>On Fri, Apr 01, 2016 at 10:06:54AM -0600, Jan Beulich wrote:
>> >>> On 24.03.16 at 21:00, <konrad.wilk@oracle.com> wrote:
>> > --- a/xen/common/xsplice.c
>> > +++ b/xen/common/xsplice.c
>> > @@ -573,6 +573,25 @@ static int prepare_payload(struct payload *payload,
>> >          region->frame[i].n_bugs = sec->sec->sh_size / sizeof(struct bug_frame);
>> >      }
>> >  
>> > +#ifdef CONFIG_X86
>> > +    sec = xsplice_elf_sec_by_name(elf, ".ex_table");
>> > +    if ( sec )
>> > +    {
>> > +        if ( !sec->sec->sh_size ||
>> > +             (sec->sec->sh_size % sizeof (struct exception_table_entry)) )
>> > +        {
>> > +            dprintk(XENLOG_DEBUG, "%s%s: Wrong size of .ex_table (exp:%lu vs %lu)!\n",
>> > +                    XSPLICE, elf->name, sizeof (struct exception_table_entry),
>> > +                    sec->sec->sh_size);
>> > +            return -EINVAL;
>> > +        }
>> > +
>> > +        region->ex = (struct exception_table_entry *)sec->load_addr;
>> > +        region->ex_end = (struct exception_table_entry *)(sec->load_addr + sec->sec->sh_size);
>> > +
>> > +        sort_exception_table(region->ex, region->ex_end);
>> > +    }
>> > +#endif
>> 
>> Nothing here is really x86-specific, so the earlier comment on the
>> conditionals better going away applies here too.
>
>But there is no sort_exception_table on ARM, nor would the sizeof work
>on ARM? Or are you saying I should add an .. empty function and
>structure for this?

The lack of sort_exception_table() would be easy to deal with, but I indeed
overlooked the sizeof(). So I agree with you and Andrew that the conditionals
should stay, but I'd like them to be inverted (i.e. test for !ARM).

Jan


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