在 2026-02-04星期三的 11:26 +0800，Icenowy Zheng写道：

在 2026-02-03星期二的 19:16 -0700，Nathan Chancellor写道：

quoted

+ Rob, Saravana, and devicetree@ since this concerns files they
own.

On Sun, Feb 01, 2026 at 09:02:59PM +0800, Icenowy Zheng wrote:

quoted

There exists a header file in include/linux/ called libfdt.h that
is
just a wrapper for libfdt header file in scripts/dtc/libfdt/.
This
makes
the headers inside libfdt copy at scripts/dtc/libfdt/ part of the
kernel
headers for building external modules.

Do not exclude them, otherwise modules that include
<linux/libfdt.h>
will fail to build externally.

Fixes: aaed5c7739be ("kbuild: slim down package for building
external modules")
Signed-off-by: Icenowy Zheng <zhengxingda@iscas.ac.cn>

This does indeed bring back scripts/dtc/libfdt back into the
headers
package that I examined. However, how does including libfdt.h in an
external module actually work, even with this change? libfdt
appears
to
be built into vmlinux IIUC and I do not see any EXPORT_SYMBOLs in
the
list, so how can you actually use any of the functions from libfdt
within the module? Would you just build and link the pieces that
your
module needs using the other source files?

To be honest what I met is quite weird -- my module [1] does not use
libfdt at all. However, as a MIPS platform-specific module, it
includes
arch/mips/include/asm/bootinfo.h, which pulls in libfdt.h.

Or maybe I should prevent libfdt.h inclusion from other kernel
headers?
It looks like only two headers in MIPS architecture-specific code
includes libfdt.h, asm/bootinfo.h and asm/machine.h .

Thanks,
Icenowy

Ah, forgot to place the [1] reference link, although I doubt whether
it's really related to the context:

[1] https://github.com/Icenowy/mips-loong-3nod-laptop-driver

quoted

quoted

---
 scripts/package/install-extmod-build | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/scripts/package/install-extmod-build

b/scripts/package/install-extmod-build
index 2576cf7902dbb..d1e448d7f59f6 100755

--- a/scripts/package/install-extmod-build
+++ b/scripts/package/install-extmod-build

@@ -11,7 +11,8 @@ is_enabled() {

 
 find_in_scripts() {
        find scripts \
-               \( -name atomic -o -name dtc -o -name kconfig -o
-
name package \) -prune -o \
+               \( -name atomic -o -name kconfig -o -name package
-
o \
+                  \( -path '*/dtc/*' -a ! -path '*/libfdt*' \)
\)
-prune -o \
                ! -name unifdef -a ! -name mk_elfconfig -a \( -
type
f -o -type l \) -print
 }
 
-- 
2.52.0