openwrt-mirror/openwrt
1
0 Fork 0
mirror of https://github.com/openwrt/openwrt.git synced 2026-10-12 04:47:17 +04:00
Code Issues Packages Projects Releases Wiki Activity

kernel: map the toolchain directory out of the debug information

Browse Source 
The compressed LoongArch kernel (vmlinuz.efi) differs between builds in
different directories. The code and data of vmlinux are identical, but
its GNU build ID is not: the debug information of vmlinux holds a
single absolute path, the include directory of the compiler, e.g.

  /builder/shared-workdir/build/staging_dir/toolchain-loongarch64_generic_gcc-14.4.0_musl/lib/gcc/loongarch64-openwrt-linux-musl/14.4.0/include

asm/loongarch.h includes the compiler's larchintrin.h, so core files
like arch/loongarch/kernel/cpu-probe.c refer to it. The prefix maps of
the kernel cover the build and the staging directory, but not the
toolchain directory. The build ID hashes all of vmlinux, so it depends
on the build directory, and with it the compressed kernel.

Map the toolchain directory as well, like the staging directory.

On loongarch64/generic, vmlinux built without the map holds this one
absolute path, like the published one; built with it, no absolute path
is left, while .text, .rodata and .data stay byte-identical.

Link: https://github.com/openwrt/openwrt/pull/25648
Signed-off-by: Paul Spooren <mail@aparcar.org>
This commit is contained in:
Paul Spooren committed 2026-10-06 22:05:20 +02:00
1 parent 82ad0727ad
commit 5888bd8c57
2 files changed
+6 -2
Download Patch File Download Diff File Expand all files Collapse all files

No files matched your search

include/kernel.mk
+2 -2
View File
@@ -101,8 +101,8 @@ endif
KERNEL_MAKE = $(MAKE) $(KERNEL_MAKEOPTS)
KERNEL_MAKE_FLAGS = \
KCFLAGS="$(call iremap,$(BUILD_DIR),$(notdir $(BUILD_DIR))) $(IREMAP_STAGING_DIR) $(filter-out -fno-plt,$(call qstrip,$(CONFIG_EXTRA_OPTIMIZATION))) $(call qstrip,$(CONFIG_KERNEL_CFLAGS))" \
KAFLAGS="$(call iremap,$(BUILD_DIR),$(notdir $(BUILD_DIR))) $(IREMAP_STAGING_DIR)" \
KCFLAGS="$(call iremap,$(BUILD_DIR),$(notdir $(BUILD_DIR))) $(IREMAP_STAGING_DIR) $(IREMAP_TOOLCHAIN_DIR) $(filter-out -fno-plt,$(call qstrip,$(CONFIG_EXTRA_OPTIMIZATION))) $(call qstrip,$(CONFIG_KERNEL_CFLAGS))" \
KAFLAGS="$(call iremap,$(BUILD_DIR),$(notdir $(BUILD_DIR))) $(IREMAP_STAGING_DIR) $(IREMAP_TOOLCHAIN_DIR)" \
HOSTCFLAGS="$(HOST_CFLAGS) -Wall -Wmissing-prototypes -Wstrict-prototypes" \
CROSS_COMPILE="$(KERNEL_CROSS)" \
ARCH="$(LINUX_KARCH)" \