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| /freebsd-11-stable/sys/net80211/ | ||
| H A D | ieee80211_ioctl.c | diff 143110 Thu Mar 03 15:35:05 MST 2005 wpaul Recently, it was reported to me that you could provoke a double fault panic with the NDISulator if you did "ifconfig ndis0 10.0.0.1/24," whereas "ifconfig ndis0 10.0.0.1/24 up" worked fine. The double fault was caused by the ifconfig thread running out of kernel stack space. (This was partly due to the NDIsulator using a couple of big buffers on the stack, but even after fixing that the double fault persisted.) It turns out that ndis_init() is called in both cases, but in the first case the code path passes through ieee80211_ioctl(), and it turns out ieee80211_ioctl() consumes a whopping 2400 bytes of stack space. Apparently, gcc -O2 causes the ieee80211_ioctl_get80211() routine to be inlined into ieee80211_ioctl(), and for some reason which I do not fully understand, this causes ieee80211_ioctl() to consume an extra 2K of stack space. To prevent this overly agressive optimization, ieee80211_ioctl_get80211() is now declared with __attribute__ ((noinline)). With this change, ieee80211_ioctl() now only reserves about 200 bytes of stack instead of 2400. |
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