Where is my diskspace?

Hi,

Dumb question.

Building a kernel (which took quite some time.. didn't think so on a 32 
core system) came to a halt:

   LD [M] 
drivers/net/wireless/broadcom/brcm80211/brcmfmac/wcc/brcmfmac-wcc.ko
ld: drivers/net/wireless/ath/ath6kl/ath6kl_core.ko: final close failed: 
No space left on device
make[2]: *** [scripts/Makefile.modfinal:56: 
drivers/net/wireless/ath/ath6kl/ath6kl_core.ko] Error 1
make[2]: *** Waiting for unfinished jobs....
make[1]: *** [/home/multix/code/linux-stable/Makefile:1923: modules] Error 2
make: *** [Makefile:251: __sub-make] Error 2


I am building in my home directory as you can see.

Filesystem      Size  Used Avail Use% Mounted on
udev            7.9G     0  7.9G   0% /dev
tmpfs           1.6G  1.5M  1.6G   1% /run
/dev/sda2        64G   43G   18G  71% /
tmpfs           7.9G     0  7.9G   0% /dev/shm
tmpfs           1.0M     0  1.0M   0% 
/run/credentials/systemd-journald.service
tmpfs           7.9G     0  7.9G   0% /tmp
/dev/sda1       471M  284M  163M  64% /boot
tmpfs           1.0M     0  1.0M   0% /run/credentials/[email protected]
tmpfs           1.6G   16K  1.6G   1% /run/user/1000
tmpfs           1.0M     0  1.0M   0% 
/run/credentials/[email protected]
tmpfs           1.6G   16K  1.6G   1% /run/user/0


shouldn't I still have 18GB free? and with enough tmp space?

I have two HD's but interesting that Linux only sees one, I guess they 
are in exact mirror then.

[   28.774161] sd 2:1:0:0: [sda] 143112591 512-byte logical blocks: 
(73.3 GB/68.2 GiB)
[   28.774504] sd 2:1:0:0: [sda] Write Protect is off
[   28.774536] sd 2:1:0:0: [sda] Mode Sense: 03 00 00 08
[   28.774834] sd 2:1:0:0: [sda] No Caching mode page found
[   28.774865] sd 2:1:0:0: [sda] Assuming drive cache: write through


Riccardo