From: Frank Rowand <frowand.list@gmail.com>
To: Viresh Kumar <viresh.kumar@linaro.org>,
Pantelis Antoniou <pantelis.antoniou@konsulko.com>,
Rob Herring <robh+dt@kernel.org>
Cc: devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-kbuild@vger.kernel.org,
Vincent Guittot <vincent.guittot@linaro.org>,
Bill Mills <bill.mills@linaro.org>,
anmar.oueja@linaro.org, Masahiro Yamada <masahiroy@kernel.org>
Subject: Re: [PATCH V4 2/3] scripts: dtc: Build fdtoverlay tool
Date: Tue, 19 Jan 2021 10:37:05 -0600 [thread overview]
Message-ID: <c77e66ee-5553-123a-7ec7-bf3d9e3cebd1@gmail.com> (raw)
In-Reply-To: <facca66aba8070ef8bdb075ec442287c81e7d23e.1610431620.git.viresh.kumar@linaro.org>
Hi Viresh,
I made these comments in the v2 patch series. I am copying them here since
this is the current version.
On 1/12/21 2:29 AM, Viresh Kumar wrote:
> We will start building overlays for platforms soon in the kernel and
> would need fdtoverlay going forward. Lets start building it.
>
> The fdtoverlay program applies (or merges) one ore more overlay dtb
> blobs to a base dtb blob. The kernel build system would later use
> fdtoverlay to generate the overlaid blobs based on platform specific
> configurations.
>
> Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
> ---
> scripts/dtc/Makefile | 6 +++++-
> 1 file changed, 5 insertions(+), 1 deletion(-)
>
> diff --git a/scripts/dtc/Makefile b/scripts/dtc/Makefile
> index 4852bf44e913..5f19386a49eb 100644
> --- a/scripts/dtc/Makefile
> +++ b/scripts/dtc/Makefile
> @@ -1,13 +1,17 @@
> # SPDX-License-Identifier: GPL-2.0
> # scripts/dtc makefile
>
> -hostprogs-always-$(CONFIG_DTC) += dtc
> +hostprogs-always-$(CONFIG_DTC) += dtc fdtoverlay
> hostprogs-always-$(CHECK_DT_BINDING) += dtc
>
> dtc-objs := dtc.o flattree.o fstree.o data.o livetree.o treesource.o \
> srcpos.o checks.o util.o
> dtc-objs += dtc-lexer.lex.o dtc-parser.tab.o
>
# The upstream project builds libfdt as a separate library. We are choosing to
# instead directly link the libfdt object files into fdtoverly
> +libfdt-objs := fdt.o fdt_ro.o fdt_wip.o fdt_sw.o fdt_rw.o fdt_strerror.o fdt_empty_tree.o fdt_addresses.o fdt_overlay.o
> +libfdt = $(addprefix libfdt/,$(libfdt-objs))
> +fdtoverlay-objs := $(libfdt) fdtoverlay.o util.o
> +
> # Source files need to get at the userspace version of libfdt_env.h to compile
> HOST_EXTRACFLAGS += -I $(srctree)/$(src)/libfdt
>
>
In general, I am a proponent of using shared libraries (which the upstream project
builds by default) because if a security bug in the library is fixed, it is fixed
for all users of the library.
In this specific case, I actually prefer the implementation that the patch provides
(directly linking the library object files into fdtoverlay, which uses the library)
because it is the only user of the library _and_ fdtoverlay will not inadvertently
use the system wide libfdt if it happens to be installed (as it is on my system).
Any thoughts on this Rob?
-Frank
next prev parent reply other threads:[~2021-01-19 18:28 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-12 8:28 [PATCH V4 0/3] scripts: dtc: Build fdtoverlay Viresh Kumar
2021-01-12 8:29 ` [PATCH V4 1/3] scripts: dtc: Add fdtoverlay.c to DTC_SOURCE Viresh Kumar
2021-01-19 16:32 ` Frank Rowand
2021-01-12 8:29 ` [PATCH V4 2/3] scripts: dtc: Build fdtoverlay tool Viresh Kumar
2021-01-19 16:37 ` Frank Rowand [this message]
2021-01-20 15:47 ` Rob Herring
2021-01-12 8:29 ` [PATCH V4 3/3] scripts: dtc: Remove the unused fdtdump.c file Viresh Kumar
2021-01-19 17:12 ` [PATCH V4 0/3] scripts: dtc: Build fdtoverlay Frank Rowand
2021-01-20 5:17 ` Viresh Kumar
2021-01-22 6:34 ` David Gibson
2021-01-26 3:42 ` Frank Rowand
2021-02-01 4:07 ` David Gibson
2021-02-03 9:51 ` Viresh Kumar
2021-02-04 14:25 ` Rob Herring
2021-02-22 6:17 ` David Gibson
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