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Re: Unable to build a BEAGLEBOARD kernel
On Oct 5, 2012, at 12:02 AM, David Laight wrote:
> On Sun, Sep 16, 2012 at 09:47:34PM +0000, Pierre Pronchery wrote:
>> Hi current-users@, port-arm@,
>> I am currently unable to build an evbarm kernel for the Beagleboard; it
>> fails with the following error:
>> === BEGIN PASTE ===
>> compile BEAGLEBOARD/arm32_kvminit.o
>> cc1: warnings being treated as errors
>> /home/khorben/Projects/netbsd/src/sys/arch/arm/arm32/arm32_kvminit.c: In
>> function 'arm32_kernel_vm_init':
>> arm32_kvminit.c:359:1: error: not protecting local variables: variable
>> length buffer
> Generally variable length buffers are not a good idea in the kernel.
> There is very limited stack space so you have to know about the largest
> possible value - which means you might as well allocate it.
Given arm has 4KB of stack space, and the amount of text+data is unknown, the
variable stack based approach was best. If stack-protector can't protect
against much declarations, it implementation is incomplete and its use in this
case should be disabled (as has been done).
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