warning: the frame size of 1040 bytes is larger than 1024 bytes

http://blog.csdn.net/tigerjibo/article/details/9316263

问题描述：

       在编译内核模块驱动时，如果出现如下警告信息：

warning: the frame size of 1040 bytes is larger than 1024 bytes。主要是因为内核中设置了堆栈报警大小，其默认为1024bytes。我们主要将其修改为4096既可以消除告警信息。

如果解决：

（1）make menuconfig

（2）kernel hacking

（3）修改warn for stack frames larger than 的数值，将其修改为4096（最好不要大过这个数值）

（4）重新编译内核模块则不会出现如上的告警信息。

http://stackoverflow.com/questions/22460599/what-are-the-safe-values-for-config-frame-warn-on-x86-arch

There is no specific safe value.

What matters is how much stack is actually used, i.e., the sum of the stack frames of all active functions.

This warning does not guarantee that you will overflow the stack space; it just shows that this function makes an overflow more likely (when used together with other big-frame functions, or with many smaller functions).

------------------------

Linux kernel defines stack size 8192 bytes for each kernel thread, so the maximum safe value is the value that will not overflow total of 8192 bytes in the whole call path.