Subject: Re: linux-next: qemu boot log difference today

From: Nathan Lynch <[email-masked]>
Date: Mon, 13 Feb 2023 23:19:43 -0600

Stephen Rothwell <[email-masked]> writes:
>
> Today's qemu boot log shows 256k extra in reserved memory:
>
> - Memory: 2046080K/2097152K available (14720K kernel code, 2944K rwdata, 18048K rodata, 5184K init, 1431K bss, 51072K reserved, 0K cma-reserved)
> + Memory: 2045824K/2097152K available (14720K kernel code, 2944K rwdata, 18048K rodata, 5184K init, 1439K bss, 51328K reserved, 0K cma-reserved)
>
> I don't know what has caused this.

Assuming it's pseries, it's the RTAS work area allocator reserving the
memory.

43033bc62d34 powerpc/pseries: add RTAS work area allocator