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When CONFIG_KABI_RESERVE=n && CONFIG_KABI_SIZE_ALIGN_CHECKS=y, with kabi reserved padding replaced by KABI_USE(), we will get the build error:
In file included from /home/liwei/main_code/hulk/arch/x86/include/asm/thread_info.h:15,
from /home/liwei/main_code/hulk/include/linux/thread_bits.h:32,
from /home/liwei/main_code/hulk/include/linux/thread_info.h:14,
from /home/liwei/main_code/hulk/arch/x86/include/asm/preempt.h:7,
from /home/liwei/main_code/hulk/include/linux/preempt.h:78,
from /home/liwei/main_code/hulk/include/linux/spinlock.h:51,
from /home/liwei/main_code/hulk/include/linux/mmzone.h:8,
from /home/liwei/main_code/hulk/include/linux/gfp.h:6,
from /home/liwei/main_code/hulk/include/linux/slab.h:15,
from /home/liwei/main_code/hulk/include/linux/crypto.h:20,
from /home/liwei/main_code/hulk/arch/x86/kernel/asm-offsets.c:9:
/home/liwei/main_code/hulk/include/linux/kabi.h:383:3: error: static assertion failed: "include/linux/fs.h:2306: long aaa is larger than . Disable CONFIG_KABI_SIZE_ALIGN_CHECKS if debugging."
_Static_assert(sizeof(struct{_new;}) <= sizeof(struct{_orig;}), \
^~~~~~~~~~~~~~
/home/liwei/main_code/hulk/include/linux/kabi.h:405:3: note: in expansion of macro ‘__KABI_CHECK_SIZE_ALIGN’
__KABI_CHECK_SIZE_ALIGN(_orig, _new); \
^~~~~~~~~~~~~~~~~~~~~~~
/home/liwei/main_code/hulk/include/linux/kabi.h:416:37: note: in expansion of macro ‘_KABI_REPLACE’
# define KABI_REPLACE(_orig, _new) _KABI_REPLACE(_orig, _new);
^~~~~~~~~~~~~
/home/liwei/main_code/hulk/include/linux/kabi.h:437:29: note: in expansion of macro ‘KABI_REPLACE’
# define KABI_USE(n, _new) KABI_REPLACE(_KABI_RESERVE(n), _new)
^~~~~~~~~~~~
/home/liwei/main_code/hulk/include/linux/fs.h:2306:2: note: in expansion of macro ‘KABI_USE’
KABI_USE(1, long aaa)
^~~~~~~~
In file included from /home/liwei/main_code/hulk/arch/x86/include/asm/thread_info.h:15,
from /home/liwei/main_code/hulk/include/linux/thread_bits.h:32,
from /home/liwei/main_code/hulk/include/linux/thread_info.h:14,
from /home/liwei/main_code/hulk/arch/x86/include/asm/preempt.h:7,
from /home/liwei/main_code/hulk/include/linux/preempt.h:78,
from /home/liwei/main_code/hulk/include/linux/spinlock.h:51,
from /home/liwei/main_code/hulk/include/linux/mmzone.h:8,
from /home/liwei/main_code/hulk/include/linux/gfp.h:6,
from /home/liwei/main_code/hulk/include/linux/slab.h:15,
from /home/liwei/main_code/hulk/include/linux/crypto.h:20,
from /home/liwei/main_code/hulk/arch/x86/kernel/asm-offsets.c:9:
/home/liwei/main_code/hulk/include/linux/kabi.h:385:3: error: static assertion failed: "include/linux/fs.h:2306: is not aligned the same as long aaa. Disable CONFIG_KABI_SIZE_ALIGN_CHECKS if debugging."
_Static_assert(__alignof__(struct{_new;}) <= __alignof__(struct{_orig;}), \
^~~~~~~~~~~~~~
/home/liwei/main_code/hulk/include/linux/kabi.h:405:3: note: in expansion of macro ‘__KABI_CHECK_SIZE_ALIGN’
__KABI_CHECK_SIZE_ALIGN(_orig, _new); \
^~~~~~~~~~~~~~~~~~~~~~~
/home/liwei/main_code/hulk/include/linux/kabi.h:416:37: note: in expansion of macro ‘_KABI_REPLACE’
# define KABI_REPLACE(_orig, _new) _KABI_REPLACE(_orig, _new);
^~~~~~~~~~~~~
/home/liwei/main_code/hulk/include/linux/kabi.h:437:29: note: in expansion of macro ‘KABI_REPLACE’
# define KABI_USE(n, _new) KABI_REPLACE(_KABI_RESERVE(n), _new)
^~~~~~~~~~~~
/home/liwei/main_code/hulk/include/linux/fs.h:2306:2: note: in expansion of macro ‘KABI_USE’
KABI_USE(1, long aaa)
^~~~~~~~
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Wei Li
成员
When CONFIG_KABI_RESERVE=n && CONFIG_KABI_SIZE_ALIGN_CHECKS=y, with kabi
reserved padding replaced by KABI_USE(), we will get the build error:
include/linux/kabi.h:383:3: error: static assertion failed:
"include/linux/fs.h:2306: long aaa is larger than .
Disable CONFIG_KABI_SIZE_ALIGN_CHECKS if debugging."
_Static_assert(sizeof(struct{_new;}) <= sizeof(struct{_orig;}),
^~~~~~~~~~~~~~
Even if we disable the check, the result of KABI_USE() when CONFIG_KABI_RESERVE=n is weird,
update _KABI_REPLACE() to fix this.
Wei Li
成员
By the way, move config entries of kabi to "General setup", and make
CONFIG_KABI_SIZE_ALIGN_CHECKS depending on CONFIG_KABI_RESERVE.
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