Re: [patch v11 03/23] ARM64: allow late use of early_ioremap

[Catalin Marinas]

On Tue, Mar 24, 2015 at 10:02:36PM +0800, Hanjun Guo wrote:
> From: Mark Salter <msalter@xxxxxxxxxx>
> 
> Commit 0e63ea48b4d8 (arm64/efi: add missing call to early_ioremap_reset())
> added a missing call to early_ioremap_reset(). This triggers a BUG if code
> tries using early_ioremap() after the early_ioremap_reset(). This is a
> problem for some ACPI code which needs short-lived temporary mappings
> after paging_init() but before acpi_early_init() in start_kernel(). This
> patch adds definitions for the __late_set_fixmap() and __late_clear_fixmap()
> which avoids the BUG by allowing later use of early_ioremap().
> 
> CC: Leif Lindholm <leif.lindholm@xxxxxxxxxx>
> CC: Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx>
> Tested-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@xxxxxxx>
> Tested-by: Mark Langsdorf <mlangsdo@xxxxxxxxxx>
> Tested-by: Jon Masters <jcm@xxxxxxxxxx>
> Tested-by: Robert Richter <rrichter@xxxxxxxxxx>
> Tested-by: Timur Tabi <timur@xxxxxxxxxxxxxx>
> Acked-by: Robert Richter <rrichter@xxxxxxxxxx>
> Reviewed-by: Grant Likely <grant.likely@xxxxxxxxxx>
> Signed-off-by: Mark Salter <msalter@xxxxxxxxxx>
> Signed-off-by: Hanjun Guo <hanjun.guo@xxxxxxxxxx>

Acked-by: Catalin Marinas <catalin.marinas@xxxxxxx>

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