[PATCH v2] kmemleak: skip scanning holes in the .bss section

[Catalin Marinas]

Hi Qian,

On Wed, Mar 13, 2019 at 10:57:17AM -0400, Qian Cai wrote:
> @@ -1531,7 +1547,14 @@ static void kmemleak_scan(void)
>  
>  	/* data/bss scanning */
>  	scan_large_block(_sdata, _edata);
> -	scan_large_block(__bss_start, __bss_stop);
> +
> +	if (bss_hole_start) {
> +		scan_large_block(__bss_start, bss_hole_start);
> +		scan_large_block(bss_hole_stop, __bss_stop);
> +	} else {
> +		scan_large_block(__bss_start, __bss_stop);
> +	}
> +
>  	scan_large_block(__start_ro_after_init, __end_ro_after_init);

I'm not a fan of this approach but I couldn't come up with anything
better. I was hoping we could check for PageReserved() in scan_block()
but on arm64 it ends up not scanning the .bss at all.

Until another user appears, I'm ok with this patch.

Acked-by: Catalin Marinas <catalin.marinas at arm.com>