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

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Message-ID: <878rh0aknk.fsf@linux.ibm.com>
Date:   Mon, 13 Feb 2023 23:19:43 -0600
From:   Nathan Lynch <nathanl@...ux.ibm.com>
To:     Stephen Rothwell <sfr@...b.auug.org.au>,
        Michael Ellerman <mpe@...erman.id.au>
Cc:     Linux Next Mailing List <linux-next@...r.kernel.org>,
        PowerPC <linuxppc-dev@...ts.ozlabs.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: linux-next: qemu boot log difference today

Stephen Rothwell <sfr@...b.auug.org.au> 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