Re: gcc-8: mm/swapfile.c:863:40: error: array subscript 1 is above array bounds of 'struct list_head[1]' [-Werror=array-bounds]

On Mon, Aug 19, 2024 at 6:16 PM Naresh Kamboju naresh.kamboju@linaro.org wrote:

On Mon, 19 Aug 2024 at 13:58, Naresh Kamboju naresh.kamboju@linaro.org wrote:

...

The x86 builds failed with gcc-8 due to following build warnings / errors on Linux next-20240802 to next-20240819.

x86_64 defconfig gcc-8 build failed x86_64 defconfig gcc-13 build pass

First seen on the next-20240802 tag.

GOOD: next-20240730 BAD: next-20240802

Anders bisected this and found the first bad commit id as, aded4352f648 ("mm: swap: separate SSD allocation from scan_swap_map_slots()") first faulty one

• Naresh

Hi Naresh,

Thanks for the report, the problem will occur when CONFIG_THP_SWAP is disabled. Can you try the following patch? I can confirm it's fixed with my test.