as reported in bug #201339 (https://bugzilla.kernel.org/show_bug.cgi?id=201339) by enabling X86_VSMP, INTERNODE_CACHE_BYTES's definition differs from the default one causing the struct size to exceed the size ok 8KB.
in order to avoid such issue, increse PERCPU_MODULE_RESERVE to 64KB if CONFIG_X86_VSMP is set. the value was caculated on linux 4.20.3, make allmodconfig all and the following oneliner: for f in `find -name *.ko`; do echo $f; readelf -S $f |grep perc; done |grep data..percpu -B 1 |grep ko |while read r; do echo -n "$r: "; objdump --syms --section=.data..percpu $r|grep data |sort -n |awk '{c++; d=strtonum("0x" $1) + strtonum("0x" $5); if (m < d) m = d;} END {printf("%d vars-> last addr 0x%x ( %d )\n", c, m, m)}' ; done |column -t |sort -k 8 -n | awk '{print $8}'| paste -sd+ | bc Signed-off-by: Eial Czerwacki <e...@scalemp.com> Signed-off-by: Shai Fultheim <s...@scalemp.com> Signed-off-by: Oren Twaig <o...@scalemp.com> --- include/linux/percpu.h | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/include/linux/percpu.h b/include/linux/percpu.h index 70b7123..6b79693 100644 --- a/include/linux/percpu.h +++ b/include/linux/percpu.h @@ -14,7 +14,11 @@ /* enough to cover all DEFINE_PER_CPUs in modules */ #ifdef CONFIG_MODULES +#ifdef X86_VSMP +#define PERCPU_MODULE_RESERVE (1 << 16) +#else #define PERCPU_MODULE_RESERVE (8 << 10) +#endif #else #define PERCPU_MODULE_RESERVE 0 #endif -- 2.7.4