Some distributions need to maintain and fix KABI compatibility so that drivers do not need to be recompiled during kernel upgrades. Fixing KABI compatibility is a dangerous and hacking job. Developers need to know clearly what they are doing and the risks they may face. KABI fix actions are closely related to the processor architecture. Fixes may not be appropriate for all architectures. Improper fix may cause kernel panic or unexpected error.
Only for expert users, and select N by default.
Xie XiuQi (2): kabi: restrict the KABI fix to a specific architecture and dist kabi: enable KABI_COMPAT series by default on x86_64 & ARM64
arch/arm64/configs/openeuler_defconfig | 5 ++-- arch/x86/configs/openeuler_defconfig | 5 ++-- include/linux/kabi.h | 2 +- init/Kconfig | 18 ++------------- lib/Kconfig.kabi | 32 ++++++++++++++++++++++++++ 5 files changed, 41 insertions(+), 21 deletions(-) create mode 100644 lib/Kconfig.kabi
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hulk inclusion category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/IB9FKU
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Some distributions need to maintain and fix KABI compatibility so that drivers do not need to be recompiled during kernel upgrades. Fixing KABI compatibility is a dangerous and hacking job. Developers need to know clearly what they are doing and the risks they may face. KABI fix actions are closely related to the processor architecture. Fixes may not be appropriate for all architectures. Improper fix may cause kernel panic or unexpected error.
Only for expert users, and select N by default.
Signed-off-by: Xie XiuQi xiexiuqi@huawei.com --- include/linux/kabi.h | 2 +- init/Kconfig | 18 ++---------------- lib/Kconfig.kabi | 32 ++++++++++++++++++++++++++++++++ 3 files changed, 35 insertions(+), 17 deletions(-) create mode 100644 lib/Kconfig.kabi
diff --git a/include/linux/kabi.h b/include/linux/kabi.h index e0f452163283..9e48d9601867 100644 --- a/include/linux/kabi.h +++ b/include/linux/kabi.h @@ -332,7 +332,7 @@ * the end of the enum. Before using this macro, make sure this is actually * safe to do. */ -#ifdef __GENKSYMS__ +#if defined(__GENKSYMS__) && IS_ENABLED(CONFIG_KABI_COMPAT)
# define KABI_CONST # define KABI_ADD_MODIFIER(_new) diff --git a/init/Kconfig b/init/Kconfig index 1840935e919c..5af21834fbff 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -1912,6 +1912,8 @@ config KALLSYMS_BASE_RELATIVE
# end of the "standard kernel features (expert users)" menu
+source "lib/Kconfig.kabi" + # syscall, maps, verifier
config ARCH_HAS_MEMBARRIER_CALLBACKS @@ -2095,22 +2097,6 @@ config BINDGEN_VERSION_TEXT config TRACEPOINTS bool
-config KABI_RESERVE - bool "Enable KABI PADDING RESERVE" - default y - help - This option enables KABI padding reserve. - For some embedded system, KABI padding reserve may be not necessary. - Disable it on demand. - -config KABI_SIZE_ALIGN_CHECKS - bool "Enables more stringent kabi checks in the macros" - default y - depends on KABI_RESERVE - help - This option enables more stringent kabi checks. Those must be disable - in case of a debug-build because they allow to change struct sizes. - source "kernel/Kconfig.kexec"
endmenu # General setup diff --git a/lib/Kconfig.kabi b/lib/Kconfig.kabi new file mode 100644 index 000000000000..b0052aa74958 --- /dev/null +++ b/lib/Kconfig.kabi @@ -0,0 +1,32 @@ +# SPDX-License-Identifier: GPL-2.0-only +config KABI_COMPAT + bool "Enable kabi compatible fix" + depends on X86_64 || ARM64 + default n + help + Support KABI compatibility fix. Some distributions need to maintain + and fix KABI compatibility so that drivers do not need to be recompiled + during kernel upgrades. Fixing KABI compatibility is a dangerous and + hacking job. Developers need to know clearly what they are doing and + the risks they may face. Related KABI fix actions are closely related + to the processor architecture. Fixes may not be appropriate for all + architectures. Improper use may cause system panic. + + If unsure, say N. + +config KABI_RESERVE + bool "Enable KABI PADDING RESERVE" + default y + depends on KABI_COMPAT + help + This option enables KABI padding reserve. + For some embedded system, KABI padding reserve may be not necessary. + Disable it on demand. + +config KABI_SIZE_ALIGN_CHECKS + bool "Enable more stringent kabi checks in the macros" + default y + depends on KABI_RESERVE + help + This option enables more stringent kabi checks. Those must be disable + in case of a debug-build because they allow to change struct sizes.
hulk inclusion category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/IB9FKU
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openEuler LTS need to maintain and fix KABI compatibility. Enable KABI_COMPAT series by default on x86_64 & ARM64.
Signed-off-by: Xie XiuQi xiexiuqi@huawei.com --- arch/arm64/configs/openeuler_defconfig | 5 +++-- arch/x86/configs/openeuler_defconfig | 5 +++-- 2 files changed, 6 insertions(+), 4 deletions(-)
diff --git a/arch/arm64/configs/openeuler_defconfig b/arch/arm64/configs/openeuler_defconfig index b152d1ffb547..fc6053a500db 100644 --- a/arch/arm64/configs/openeuler_defconfig +++ b/arch/arm64/configs/openeuler_defconfig @@ -249,6 +249,9 @@ CONFIG_SHMEM=y CONFIG_AIO=y CONFIG_IO_URING=y CONFIG_ADVISE_SYSCALLS=y +CONFIG_KABI_COMPAT=y +CONFIG_KABI_RESERVE=y +CONFIG_KABI_SIZE_ALIGN_CHECKS=y CONFIG_MEMBARRIER=y CONFIG_KALLSYMS=y # CONFIG_KALLSYMS_SELFTEST is not set @@ -274,8 +277,6 @@ CONFIG_DEBUG_PERF_USE_VMALLOC=y CONFIG_SYSTEM_DATA_VERIFICATION=y CONFIG_PROFILING=y CONFIG_TRACEPOINTS=y -CONFIG_KABI_RESERVE=y -CONFIG_KABI_SIZE_ALIGN_CHECKS=y
# # Kexec and crash features diff --git a/arch/x86/configs/openeuler_defconfig b/arch/x86/configs/openeuler_defconfig index 8e577c409676..3d899f7c3756 100644 --- a/arch/x86/configs/openeuler_defconfig +++ b/arch/x86/configs/openeuler_defconfig @@ -269,6 +269,9 @@ CONFIG_SHMEM=y CONFIG_AIO=y CONFIG_IO_URING=y CONFIG_ADVISE_SYSCALLS=y +CONFIG_KABI_COMPAT=y +CONFIG_KABI_RESERVE=y +CONFIG_KABI_SIZE_ALIGN_CHECKS=y CONFIG_MEMBARRIER=y CONFIG_KALLSYMS=y # CONFIG_KALLSYMS_SELFTEST is not set @@ -292,8 +295,6 @@ CONFIG_PERF_EVENTS=y CONFIG_SYSTEM_DATA_VERIFICATION=y CONFIG_PROFILING=y CONFIG_TRACEPOINTS=y -CONFIG_KABI_RESERVE=y -CONFIG_KABI_SIZE_ALIGN_CHECKS=y
# # Kexec and crash features
-
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Xie XiuQi