Re: [PATCH 01/12] extarray: define helpers for arrays defined in linker scripts

[Peter Zijlstra]

On Sun, Oct 16, 2016 at 05:16:05PM +0200, Vegard Nossum wrote:
> The test in this loop:
> 
> 	for (b_fw = __start_builtin_fw; b_fw != __end_builtin_fw; b_fw++) {
> 
> was getting completely compiled out by my gcc, 7.0.0 20160520. The result
> was that the loop was going beyond the end of the builtin_fw array and
> giving me a page fault when trying to dereference b_fw->name.
> 
> This is because __start_builtin_fw and __end_builtin_fw are both declared
> as (separate) arrays, and so gcc conludes that b_fw can never point to
> __end_builtin_fw.
> 

Urgh, isn't that the kind of 'optimizations' we should shoot in the head
for the kernel? Just like the -fno-strict-aliassing crap?