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# 6e799cb6 18-Nov-2020 Thomas Gleixner <[email protected]>

mm/highmem: Provide and use CONFIG_DEBUG_KMAP_LOCAL

CONFIG_KMAP_LOCAL can be enabled by x86/32bit even if CONFIG_HIGHMEM is not
enabled for temporary MMIO space mappings.

Provide it as a seperate c

mm/highmem: Provide and use CONFIG_DEBUG_KMAP_LOCAL

CONFIG_KMAP_LOCAL can be enabled by x86/32bit even if CONFIG_HIGHMEM is not
enabled for temporary MMIO space mappings.

Provide it as a seperate config option which depends on CONFIG_KMAP_LOCAL
and let CONFIG_DEBUG_HIGHMEM select it.

This won't increase the debug coverage of this significantly but it paves
the way to do so.

Signed-off-by: Thomas Gleixner <[email protected]>
Acked-by: Peter Zijlstra (Intel) <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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Revision tags: v5.10-rc4, v5.10-rc3
# 4f8b96cd 03-Nov-2020 Thomas Gleixner <[email protected]>

asm-generic: Provide kmap_size.h

kmap_types.h is a misnomer because the old atomic MAP based array does not
exist anymore and the whole indirection of architectures including
kmap_types.h is inconin

asm-generic: Provide kmap_size.h

kmap_types.h is a misnomer because the old atomic MAP based array does not
exist anymore and the whole indirection of architectures including
kmap_types.h is inconinstent and does not allow to provide guard page
debugging for this misfeature.

Add a common header file which defines the mapping stack size for all
architectures. Will be used when converting architectures over to a
generic kmap_local/atomic implementation.

The array size is chosen with the following constraints in mind:

- The deepest nest level in one context is 3 according to code
inspection.

- The worst case nesting for the upcoming reemptible version would be:

2 maps in task context and a fault inside
2 maps in the fault handler
3 maps in softirq
2 maps in interrupt

So a total of 16 is sufficient and probably overestimated.

Signed-off-by: Thomas Gleixner <[email protected]>
Acked-by: Arnd Bergmann <[email protected]>
Cc: Andrew Morton <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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