On Sun, Jan 23, 2022 at 4:23 AM Chan Kim <ckim@etri.re.kr> wrote:
Hello all,
In linux 5.4.21, when tell the compiler to use no optimzation for function early_fixmap_init as below,
(I need to compile with O0 to follow what’s happening here using gdb.)
#pragma GCC push_options
#pragma GCC optimze ("O0")
void __init early_fixmap_init(void)
{
...
}
#pragma GCC pop_options
I get this compiler error below. (make ARCH=arm64 CROSS_COMPILE=aarch64-none-elf- Image -j24)
CALL scripts/atomic/check-atomics.sh
CALL scripts/checksyscalls.sh
CHK include/generated/compile.h
CC arch/arm64/mm/mmu.o
CC drivers/irqchip/irq-gic-v3.o
In file included from ./include/linux/build_bug.h:5,
from ./arch/arm64/include/asm/sysreg.h:758,
from ./arch/arm64/include/asm/cputype.h:126,
from ./arch/arm64/include/asm/cache.h:8,
from ./include/linux/cache.h:6,
from arch/arm64/mm/mmu.c:9:
./arch/arm64/include/asm/pgalloc.h: In function '__pgd_populate.constprop':
./include/linux/compiler.h:350:38: error: call to '__compiletime_assert_88' declared with attribute error: BUILD_BUG failed
350 | _compiletime_assert(condition, msg, __compiletime_assert_, __LINE__)
| ^
./include/linux/compiler.h:331:4: note: in definition of macro '__compiletime_assert'
331 | prefix ## suffix(); \
| ^~~~~~
./include/linux/compiler.h:350:2: note: in expansion of macro '_compiletime_assert'
350 | _compiletime_assert(condition, msg, __compiletime_assert_, __LINE__)
| ^~~~~~~~~~~~~~~~~~~
./include/linux/build_bug.h:39:37: note: in expansion of macro 'compiletime_assert'
39 | #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
| ^~~~~~~~~~~~~~~~~~
./include/linux/build_bug.h:59:21: note: in expansion of macro 'BUILD_BUG_ON_MSG'
59 | #define BUILD_BUG() BUILD_BUG_ON_MSG(1, "BUILD_BUG failed")
| ^~~~~~~~~~~~~~~~
./arch/arm64/include/asm/pgalloc.h:88:2: note: in expansion of macro 'BUILD_BUG'
88 | BUILD_BUG();
| ^~~~~~~~~
make[2]: *** [scripts/Makefile.build:265: arch/arm64/mm/mmu.o] Error 1
make[1]: *** [scripts/Makefile.build:509: arch/arm64/mm] Error 2
make: *** [Makefile:1652: arch/arm64] Error 2
make: *** Waiting for unfinished jobs....
AR drivers/irqchip/built-in.a
AR drivers/built-in.
What does this mean and what should I do?
it means that some precondition failed, and you reached a known broken setup. Instead of giving you a broken kernel, its told you that you have to fix this 1st. try making an intermediate output, forex: make init/main.i that should provide hints as to how you got to the BUILD_BUG I dont think banging on -O compile options will help, at least not after seeing GregKH opine on it.
Thanks!
Chan Kim
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