[PATCH v2 0/2] arm64: don't call early_*map() post paging_init()

Will Deacon will.deacon at arm.com
Tue Jan 6 05:59:42 PST 2015

On Tue, Jan 06, 2015 at 01:41:11PM +0000, Leif Lindholm wrote:
> This (tiny) series resolves a fairly serious problem with
> early_ioremap/iounmap/memremap/memunmap on arm64. These functions
> cannot safely be called after paging_init(), but the sanity check
> was not triggering.
> As a result, a fixmap entry was incorrectly cleared during
> early_initcalls on arm64 UEFI systems.
> 1/2 reworks the arm64 UEFI support code to not attempt these calls
> and
> 2/2 enables the sanity check
> Changes since v1:
> - Rebased to v3.19-rc3
> - Added 'Fixes:' tags
> - Reworked 1/2 to restore call to efi_setup_idmap() to the original
>   location in the boot process.

Looks reasonable to me; do they need a CC stable, or is this not a problem
that matters in practice?


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