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authorMark Rutland <mark.rutland@arm.com>2017-07-21 14:25:33 +0100
committerMark Rutland <mark.rutland@arm.com>2017-08-15 18:36:04 +0100
commite3067861ba6650a566a6273738c23c956ad55c02 (patch)
tree95c523e8bbb75e883b02e659481fa9557f2e56e6 /arch/arm64/include/asm/stacktrace.h
parentarm64: use an irq stack pointer (diff)
downloadlinux-dev-e3067861ba6650a566a6273738c23c956ad55c02.tar.xz
linux-dev-e3067861ba6650a566a6273738c23c956ad55c02.zip
arm64: add basic VMAP_STACK support
This patch enables arm64 to be built with vmap'd task and IRQ stacks. As vmap'd stacks are mapped at page granularity, stacks must be a multiple of PAGE_SIZE. This means that a 64K page kernel must use stacks of at least 64K in size. To minimize the increase in Image size, IRQ stacks are dynamically allocated at boot time, rather than embedding the boot CPU's IRQ stack in the kernel image. This patch was co-authored by Ard Biesheuvel and Mark Rutland. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Mark Rutland <mark.rutland@arm.com> Reviewed-by: Will Deacon <will.deacon@arm.com> Tested-by: Laura Abbott <labbott@redhat.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: James Morse <james.morse@arm.com>
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