arch/x86/built-in.o: In function `vdso_addr':
vma.c:(.text+0xa627d): undefined reference to `align_vdso_addr'
fs/built-in.o: In function `__mb_cache_entry_release':
mbcache.c:(.text+0x9b2cf): undefined reference to `log2'
mbcache.c:(.text+0x9b2db): undefined reference to `__fixunsdfsi'
mbcache.c:(.text+0x9b392): undefined reference to `log2'
mbcache.c:(.text+0x9b3a4): undefined reference to `__fixunsdfsi'
mbcache.c:(.text+0x9b4be): undefined reference to `log2'
mbcache.c:(.text+0x9b4d0): undefined reference to `__fixunsdfsi'
fs/built-in.o: In function `__mb_cache_entry_find':
mbcache.c:(.text+0x9b5ee): undefined reference to `log2'
mbcache.c:(.text+0x9b5fa): undefined reference to `__fixunsdfsi'
mbcache.c:(.text+0x9b6cc): undefined reference to `log2'
mbcache.c:(.text+0x9b6de): undefined reference to `__fixunsdfsi'
mbcache.c:(.text+0x9b74c): undefined reference to `log2'
mbcache.c:(.text+0x9b758): undefined reference to `__fixunsdfsi'
mbcache.c:(.text+0x9b7de): undefined reference to `log2'
mbcache.c:(.text+0x9b7f0): undefined reference to `__fixunsdfsi'
fs/built-in.o: In function `mb_cache_entry_get':
(.text+0x9e14c): undefined reference to `log2'
fs/built-in.o: In function `mb_cache_entry_get':
(.text+0x9e161): undefined reference to `__fixunsdfsi'
fs/built-in.o: In function `mb_cache_entry_get':
(.text+0x9e284): undefined reference to `log2'
fs/built-in.o: In function `mb_cache_entry_get':
(.text+0x9e296): undefined reference to `__fixunsdfsi'
fs/built-in.o: In function `mb_cache_entry_get':
(.text+0x9e317): undefined reference to `log2'
fs/built-in.o: In function `mb_cache_entry_get':
(.text+0x9e323): undefined reference to `__fixunsdfsi'
fs/built-in.o: In function `mb_cache_entry_get':
(.text+0x9e3ce): undefined reference to `log2'
fs/built-in.o: In function `mb_cache_entry_get':
(.text+0x9e3e0): undefined reference to `__fixunsdfsi'
make: [vmlinux] Error 1 (ignored)