Commit 8cf1c6f4 authored by Xie XiuQi's avatar Xie XiuQi
Browse files

kabi: restrict the KABI fix to a specific architecture and dist 

hulk inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/IB9FKU



--------------------------------

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: default avatarXie XiuQi <xiexiuqi@huawei.com>
parent e1c03dd9

include/linux/kabi.h

+1 −1
Original line number Diff line number Diff line
@@ -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)

init/Kconfig

+2 −16
Original line number Diff line number Diff line
@@ -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

lib/Kconfig.kabi

0 → 100644
+32 −0
Original line number Diff line number Diff line 
# 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.