I'd like to compiled 6.12-rc7 for x86/64. I applied the WIP PR#16547 but am finding that the kernel compilation fails with the following error. Wondering if anyone has some thoughts to circumvent it.
EDIT: the source of this error is the following in my .config:
CONFIG_KERNEL_CFLAGS="-march=x86-64-v3 -O3 -pipe"
If I replace the -O3 with -O2 I do not see the error. Why?
In file included from ./include/linux/string.h:390,
from ./include/linux/bitmap.h:13,
from ./include/linux/cpumask.h:12,
from ./arch/x86/include/asm/paravirt.h:21,
from ./arch/x86/include/asm/irqflags.h:80,
from ./include/linux/irqflags.h:18,
from ./include/linux/spinlock.h:59,
from ./include/linux/swait.h:7,
from ./include/linux/completion.h:12,
from kernel/padata.c:14:
In function 'bitmap_copy',
inlined from 'cpumask_copy' at ./include/linux/cpumask.h:839:2,
inlined from '__padata_set_cpumasks' at kernel/padata.c:730:2:
./include/linux/fortify-string.h:114:33: error: '__builtin_memcpy' reading between 65 and 536870904 bytes from a region of size 64 [-Werror=stringop-overread]
114 | #define __underlying_memcpy __builtin_memcpy
| ^
./include/linux/fortify-string.h:633:9: note: in expansion of macro '__underlying_memcpy'
633 | __underlying_##op(p, q, __fortify_size); \
| ^~~~~~~~~~~~~
./include/linux/fortify-string.h:678:26: note: in expansion of macro '__fortify_memcpy_chk'
678 | #define memcpy(p, q, s) __fortify_memcpy_chk(p, q, s, \
| ^~~~~~~~~~~~~~~~~~~~
./include/linux/bitmap.h:259:17: note: in expansion of macro 'memcpy'
259 | memcpy(dst, src, len);
| ^~~~~~
kernel/padata.c: In function '__padata_set_cpumasks':
kernel/padata.c:713:48: note: source object 'pcpumask' of size [0, 64]
713 | cpumask_var_t pcpumask,
| ~~~~~~~~~~~~~~^~~~~~~~
In function 'bitmap_copy',
inlined from 'cpumask_copy' at ./include/linux/cpumask.h:839:2,
inlined from '__padata_set_cpumasks' at kernel/padata.c:730:2:
./include/linux/fortify-string.h:114:33: error: '__builtin_memcpy' reading between 65 and 536870904 bytes from a region of size 64 [-Werror=stringop-overread]
114 | #define __underlying_memcpy __builtin_memcpy
| ^
./include/linux/fortify-string.h:633:9: note: in expansion of macro '__underlying_memcpy'
633 | __underlying_##op(p, q, __fortify_size); \
| ^~~~~~~~~~~~~
./include/linux/fortify-string.h:678:26: note: in expansion of macro '__fortify_memcpy_chk'
678 | #define memcpy(p, q, s) __fortify_memcpy_chk(p, q, s, \
| ^~~~~~~~~~~~~~~~~~~~
./include/linux/bitmap.h:259:17: note: in expansion of macro 'memcpy'
259 | memcpy(dst, src, len);
| ^~~~~~
kernel/padata.c: In function '__padata_set_cpumasks':
kernel/padata.c:713:48: note: source object 'pcpumask' of size [0, 64]
713 | cpumask_var_t pcpumask,
| ~~~~~~~~~~~~~~^~~~~~~~
CC drivers/usb/host/xhci-ext-caps.o
AR drivers/media/platform/st/sti/hva/built-in.a
CC drivers/usb/host/xhci-ring.o
AR drivers/media/platform/st/stm32/built-in.a
CC drivers/acpi/acpica/nsparse.o
CC fs/proc/kcore.o
CC [M] net/netfilter/nf_flow_table_inet.o
AR drivers/media/platform/st/built-in.a
CC drivers/ptp/ptp_sysfs.o
CC [M] drivers/i2c/i2c-smbus.o
AR drivers/media/platform/sunxi/sun4i-csi/built-in.a
AR drivers/media/platform/sunxi/sun6i-csi/built-in.a
AR drivers/media/platform/sunxi/sun6i-mipi-csi2/built-in.a
cc1: all warnings being treated as errors
AR drivers/media/platform/sunxi/sun8i-a83t-mipi-csi2/built-in.a
make[8]: *** [scripts/Makefile.build:229: kernel/padata.o] Error 1
