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Subject[PATCH 0/4] Switch GHES ioremap_page_range() to use fixmap
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GHES is doing ioremap_page_range() in both NMI and irq context, neither
are safe as it may sleep to allocate intermediate levels of page table.

Replace the NMI/irq GHES_IOREMAP_PAGES to use a fixmap entry each.

After this nothing uses ghes_ioremap_area or arch_apei_flush_tlb_one(),
rip them out.

This hasn't been tested on a system with x86's NOTIFY_NMI. Any more
more testing would be welcome. These patches are (still) based on rc7.

Changes since RFC:
* Added #ifdefs around the entries in fixmap.h
* Added a paragraph about HAVE_ACPI_APEI to the commit message
* Merged the first three patches for improved history

I've tried to be clear with who-acked-what when merging the patches.
For reference, the arch-acks are here:
https://lkml.org/lkml/2017/11/2/254
https://lkml.org/lkml/2017/10/31/780


Thanks,

James Morse (4):
ACPI / APEI: Replace ioremap_page_range() with fixmap
ACPI / APEI: Remove ghes_ioremap_area
arm64: mm: Remove arch_apei_flush_tlb_one()
ACPI / APEI: Remove arch_apei_flush_tlb_one()

arch/arm64/include/asm/acpi.h | 12 ------
arch/arm64/include/asm/fixmap.h | 7 ++++
arch/arm64/mm/mmu.c | 4 ++
arch/x86/include/asm/fixmap.h | 6 +++
arch/x86/kernel/acpi/apei.c | 5 ---
drivers/acpi/apei/ghes.c | 84 +++++++++--------------------------------
include/acpi/apei.h | 1 -
7 files changed, 34 insertions(+), 85 deletions(-)

--
2.15.0.rc2

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