Re: patching 2.4.29 with fr1

Peter T. Breuer <[email protected]> wrote:
> Hegedus Gabor <[email protected]> wrote:
> > Anybody tried to patch kernel 2.4.29 with fr1 patch? I need it couse I
> 
> Is there a problem?
> 
> > use raid1 to boot, root, home and I want to use fr1 over this with image
> > files.
> > 
> > I try to patch 2.4.24 too: Then a compille:
> 
> Well, I would stick to only one of those!
> 
> > --------------------------------------------
> > drivers/md/mddev.o(.text+0x3810): In function `raid1_sync_request':
> > : undefined reference to `md_throttle'
> 
> That's fine. md_throttle is defined in md.c (as you can see from the
> patch!).  I don't quite know what "mddev.o" is nor why you should be
> compiling it. Perhaps you can fill me in on that. 

I'll have to add that as far as I can see, mddev.o only exists in my
UML kernels, and is 8 bytes long:

  betty:/usr/local/src/linux-2.4.24-uml/drivers/md% od -a mddev.o
  0000000   !   <   a   r   c   h   >  nl
  0000010

"file" says it's a .a , but I don't know about that!

  betty:/usr/local/src/linux-2.4.24-uml/drivers/md% file mddev.o
  mddev.o: current ar archive
  betty:/usr/local/src/linux-2.4.24-uml/drivers/md%

So I really would need more detail on what this file is and how it is
created. Rules.make seems to say that O_TARGET specifies it to be
always made, and to be made by the link loader from the compiled-in
stuff. But the comments seem to say it is a compound entity ..

#
# Rule to compile a set of .o files into one .o file
#
ifdef O_TARGET
$(O_TARGET): $(obj-y)
        rm -f $@
    ifneq "$(strip $(obj-y))" ""
        $(LD) $(EXTRA_LDFLAGS) -r -o $@ $(filter $(obj-y), $^)
    else
        $(AR) rcs $@
    endif
        @ ( \
            echo ífeq ($(strip $(subst $(comma),:,$(EXTRA_LDFLAGS) $(obj-y))),$$(strip $$(subst $$(comma),:,$$(EXTRA_LDFLAGS) $$(obj-y))))' ; \
            echo 'FILES_FLAGS_UP_TO_DATE += $@' ; \
            echo éndif' \
        ) > $(dir $@)/.$(notdir $@).flags
endif # O_TARGET

so my guess is that it is a compendium of all the to-be-compiled-in
stuff in a directory.

In that case the problem would be that you are compiling everything
into the kernel, and the raid1 stuff in the kernel wants something in
the md stuff that is normally exported from md when it is a module, but
seems not to be when it is compiled in.


So "remove the static".

> 
>   --- linux-2.4.24-uml/drivers/md/md.c.orig       Sun Sep 19 16:56:33 2004
>   +++ linux-2.4.24-uml/drivers/md/md.c    Sun Sep 19 16:56:38 2004
>   ...
>   @@ -108,6 +123,10 @@
>   ...
>   +#ifdef MD_BITMAP_SUPPORT
>   +/* PTB md_throttle permits speed calculation adjustments from personality */
>   +static atomic_t md_throttle[MAX_MD_DEVS];
>   +#endif /* MD_BITMAP_SUPPORT */
> 
> But plainly if it (whatever "it" is) wants md_throttle, then you want to
> remove the "static", and/or possibly export the symbol formally,
> depending on precisely what the symbol is needed for. I guess removing
> the "static" will be enough.

Peter