[PATCH v2] powerpc/sstep: Fix array out of bound warning

[Naveen N. Rao]

On 2021/01/29 12:47PM, Ravi Bangoria wrote:
> Compiling kernel with -Warray-bounds throws below warning:
> 
>   In function 'emulate_vsx_store':
>   warning: array subscript is above array bounds [-Warray-bounds]
>   buf.d[2] = byterev_8(reg->d[1]);
>   ~~~~~^~~
>   buf.d[3] = byterev_8(reg->d[0]);
>   ~~~~~^~~
> 
> Fix it by using temporary array variable 'union vsx_reg buf32[]' in
> that code block. Also, with element_size = 32, 'union vsx_reg *reg'
> is an array of size 2. So, use 'reg' as an array instead of pointer
> in the same code block.
> 
> Fixes: af99da74333b ("powerpc/sstep: Support VSX vector paired storage access instructions")
> Suggested-by: Naveen N. Rao <naveen.n.rao at linux.vnet.ibm.com>
> Signed-off-by: Ravi Bangoria <ravi.bangoria at linux.ibm.com>
> ---
> v1: http://lore.kernel.org/r/20210115061620.692500-1-ravi.bangoria@linux.ibm.com
> v1->v2:
>   - Change code only in the affected block

I don't see the compiler warning with -Warray-bounds with this patch:
Tested-by: Naveen N. Rao <naveen.n.rao at linux.vnet.ibm.com>

- Naveen