From: Li Lingfeng lilingfeng3@huawei.com
hulk inclusion category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/I8LQBH
Reference: https://gitlab.com/redhat/centos-stream/src/kernel/centos-stream-9/-/commit/...
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We don't really need the field names to be globally unique, it is enough when they are unique in the given struct. Since structs do not generally span mutliple files, using the line number is enough to ensure an unique identifier. It means that we can't use two KABI_RENAME macros on the same line but that's not happening anyway.
This allows pahole to deduplicate the type info of structs using KABI macros, lowering the size of vmlinuz from 26M to 8.5
Signed-off-by: Li Lingfeng lilingfeng3@huawei.com Reviewed-by: Zhang Yi yi.zhang@huawei.com Reviewed-by: zhihao Cheng chengzhihao1@huawei.com Signed-off-by: Jialin Zhang zhangjialin11@huawei.com --- include/linux/kabi.h | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/include/linux/kabi.h b/include/linux/kabi.h index 994fa771d221..e0f452163283 100644 --- a/include/linux/kabi.h +++ b/include/linux/kabi.h @@ -393,6 +393,8 @@ # define __KABI_CHECK_SIZE(_item, _size) #endif
+#define KABI_UNIQUE_ID __PASTE(kabi_hidden_, __LINE__) + # define _KABI_DEPRECATE(_type, _orig) _type kabi_reserved_##_orig # define _KABI_DEPRECATE_FN(_type, _orig, _args...) \ _type (* kabi_reserved_##_orig)(_args) @@ -402,7 +404,7 @@ _new; \ struct { \ _orig; \ - } __UNIQUE_ID(kabi_hide); \ + } KABI_UNIQUE_ID; \ __KABI_CHECK_SIZE_ALIGN(_orig, _new); \ } #else