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SubjectRe: [PATCH] efi/libstub: refactor cmd_stubcopy
On Tue, 12 Feb 2019 at 04:45, Masahiro Yamada
<yamada.masahiro@socionext.com> wrote:
>
> It took me a while to understand what is going on in the nested
> if-blocks.
>
> Simplify it by removing unneeded code.
>
> - if_changed automatically adds 'set -e', so any failure in the
> series of commands makes it immediately fail as a whole.
> So, the outer if block is entirely redundant.
>
> - Since commit 9c2af1c7377a ("kbuild: add .DELETE_ON_ERROR special
> target"), GNU Make automatically deletes the target on any failure
> in its recipe. The explicit 'rm -f $@' is redundant.
>
> - surrounding commands with ( ) will spawn a subshell to execute them
> in it, but it is rarely useful to do so.
>
> Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>

Assuming that it still works as expected:

Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>

You can test this by adding a statically initialized global function
pointer to any of the libstub source files that get built for ARM.

Thanks!

> ---
>
> drivers/firmware/efi/libstub/Makefile | 13 +++++++------
> 1 file changed, 7 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/firmware/efi/libstub/Makefile b/drivers/firmware/efi/libstub/Makefile
> index d984509..7788e8a 100644
> --- a/drivers/firmware/efi/libstub/Makefile
> +++ b/drivers/firmware/efi/libstub/Makefile
> @@ -86,12 +86,13 @@ $(obj)/%.stub.o: $(obj)/%.o FORCE
> # this time, use objcopy and leave all sections in place.
> #
> quiet_cmd_stubcopy = STUBCPY $@
> - cmd_stubcopy = if $(STRIP) --strip-debug $(STUBCOPY_RM-y) -o $@ $<; \
> - then if $(OBJDUMP) -r $@ | grep $(STUBCOPY_RELOC-y); \
> - then (echo >&2 "$@: absolute symbol references not allowed in the EFI stub"; \
> - rm -f $@; /bin/false); \
> - else $(OBJCOPY) $(STUBCOPY_FLAGS-y) $< $@; fi \
> - else /bin/false; fi
> + cmd_stubcopy = \
> + $(STRIP) --strip-debug $(STUBCOPY_RM-y) -o $@ $<; \
> + if $(OBJDUMP) -r $@ | grep $(STUBCOPY_RELOC-y); then \
> + echo "$@: absolute symbol references not allowed in the EFI stub" >&2; \
> + /bin/false; \
> + fi; \
> + $(OBJCOPY) $(STUBCOPY_FLAGS-y) $< $@
>
> #
> # ARM discards the .data section because it disallows r/w data in the
> --
> 2.7.4
>

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