linux-kernel - Re: [PATCH 04/14] x86, ACPI: make acpi override finding work with 32bit flat mode

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Date:	Thu, 7 Mar 2013 23:16:11 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	Tejun Heo <tj@...nel.org>, "Yu, Fenghua" <fenghua.yu@...el.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	Thomas Renninger <trenn@...e.de>,
	Tang Chen <tangchen@...fujitsu.com>,
	linux-kernel@...r.kernel.org, Pekka Enberg <penberg@...nel.org>,
	Jacob Shin <jacob.shin@....com>,
	"Rafael J. Wysocki" <rjw@...k.pl>, linux-acpi@...r.kernel.org
Subject: Re: [PATCH 04/14] x86, ACPI: make acpi override finding work with
 32bit flat mode

On Thu, 7 Mar 2013 22:57:21 -0800 Yinghai Lu <yinghai@...nel.org> wrote:

> >
> >> @@ -552,38 +552,47 @@ u8 __init acpi_table_checksum(u8 *buffer, u32 length)
> >>       return sum;
> >>  }
> >>
> >> -/* All but ACPI_SIG_RSDP and ACPI_SIG_FACS: */
> >> -static const char * const table_sigs[] = {
> >> -     ACPI_SIG_BERT, ACPI_SIG_CPEP, ACPI_SIG_ECDT, ACPI_SIG_EINJ,
> >> -     ACPI_SIG_ERST, ACPI_SIG_HEST, ACPI_SIG_MADT, ACPI_SIG_MSCT,
> >> -     ACPI_SIG_SBST, ACPI_SIG_SLIT, ACPI_SIG_SRAT, ACPI_SIG_ASF,
> >> -     ACPI_SIG_BOOT, ACPI_SIG_DBGP, ACPI_SIG_DMAR, ACPI_SIG_HPET,
> >> -     ACPI_SIG_IBFT, ACPI_SIG_IVRS, ACPI_SIG_MCFG, ACPI_SIG_MCHI,
> >> -     ACPI_SIG_SLIC, ACPI_SIG_SPCR, ACPI_SIG_SPMI, ACPI_SIG_TCPA,
> >> -     ACPI_SIG_UEFI, ACPI_SIG_WAET, ACPI_SIG_WDAT, ACPI_SIG_WDDT,
> >> -     ACPI_SIG_WDRT, ACPI_SIG_DSDT, ACPI_SIG_FADT, ACPI_SIG_PSDT,
> >> -     ACPI_SIG_RSDT, ACPI_SIG_XSDT, ACPI_SIG_SSDT, NULL };
> >
> > Why is this table made a stack variable?  What's the benefit of doing
> > that?
> 
> so I do need to switch global variables to phys and access it.

What Tejun means is that it should be marked "static" within
acpi_initrd_override(), so we don't have to build a copy on the stack
at runtime each time acpi_initrd_override() is called.

While we're there, it should be __initdata also.
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