Thomas Gleixner
4f8b96cd47
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 <tglx@linutronix.de>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Cc: Andrew Morton <akpm@linux-foundation.org>
Link: https://lore.kernel.org/r/20201103095857.078043987@linutronix.de
65 lines
1.6 KiB
Makefile
65 lines
1.6 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0
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#
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# asm headers that all architectures except um should have
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# (This file is not included when SRCARCH=um since UML borrows several
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# asm headers from the host architecutre.)
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mandatory-y += atomic.h
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mandatory-y += barrier.h
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mandatory-y += bitops.h
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mandatory-y += bug.h
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mandatory-y += bugs.h
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mandatory-y += cacheflush.h
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mandatory-y += checksum.h
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mandatory-y += compat.h
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mandatory-y += current.h
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mandatory-y += delay.h
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mandatory-y += device.h
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mandatory-y += div64.h
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mandatory-y += dma-mapping.h
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mandatory-y += dma.h
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mandatory-y += emergency-restart.h
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mandatory-y += exec.h
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mandatory-y += fb.h
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mandatory-y += ftrace.h
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mandatory-y += futex.h
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mandatory-y += hardirq.h
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mandatory-y += hw_irq.h
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mandatory-y += io.h
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mandatory-y += irq.h
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mandatory-y += irq_regs.h
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mandatory-y += irq_work.h
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mandatory-y += kdebug.h
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mandatory-y += kmap_types.h
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mandatory-y += kmap_size.h
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mandatory-y += kprobes.h
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mandatory-y += linkage.h
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mandatory-y += local.h
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mandatory-y += mm-arch-hooks.h
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mandatory-y += mmiowb.h
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mandatory-y += mmu.h
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mandatory-y += mmu_context.h
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mandatory-y += module.h
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mandatory-y += module.lds.h
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mandatory-y += msi.h
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mandatory-y += pci.h
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mandatory-y += percpu.h
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mandatory-y += pgalloc.h
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mandatory-y += preempt.h
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mandatory-y += rwonce.h
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mandatory-y += sections.h
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mandatory-y += serial.h
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mandatory-y += shmparam.h
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mandatory-y += simd.h
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mandatory-y += switch_to.h
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mandatory-y += timex.h
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mandatory-y += tlbflush.h
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mandatory-y += topology.h
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mandatory-y += trace_clock.h
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mandatory-y += uaccess.h
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mandatory-y += unaligned.h
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mandatory-y += vermagic.h
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mandatory-y += vga.h
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mandatory-y += word-at-a-time.h
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mandatory-y += xor.h
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