Re: gcc-12: build errors: arch/arm64/kernel/setup.c:225:56: warning: array subscript -1 is outside array bounds of 'char[]' [-Warray-bounds]

Hi,

On Fri, Jun 03, 2022 at 09:40:07AM +0200, Arnd Bergmann wrote:

On Fri, Jun 3, 2022 at 4:03 AM Naresh Kamboju naresh.kamboju@linaro.org wrote:

...

inlined from 'setup_arch' at arch/arm64/kernel/setup.c:350:2:

arch/arm64/kernel/setup.c:225:56: warning: array subscript -1 is outside array bounds of 'char[]' [-Warray-bounds] 225 | kernel_code.end = __pa_symbol(__init_begin - 1);

Is this the only warning of this type that you get for arm64?

In that function, both kernel_code.end and kernel_data_end show a similar warning in 5.19-rc1

I think the easy fix would be to reword this line to

   kernel_code.end     = __pa_symbol(__init_begin) - 1;

Doing this for both fix the warnings.

Maxime