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| author | Mark Rutland <mark.rutland@arm.com> | 2017-07-21 15:25:33 +0200 |
|---|---|---|
| committer | Mark Rutland <mark.rutland@arm.com> | 2017-08-15 19:36:04 +0200 |
| commit | e3067861ba6650a566a6273738c23c956ad55c02 (patch) | |
| tree | 95c523e8bbb75e883b02e659481fa9557f2e56e6 /arch/arm64/Kconfig | |
| parent | arm64: use an irq stack pointer (diff) | |
| download | linux-e3067861ba6650a566a6273738c23c956ad55c02.tar.xz linux-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>
Diffstat (limited to 'arch/arm64/Kconfig')
| -rw-r--r-- | arch/arm64/Kconfig | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index dfd908630631..d66f9db3e6db 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -75,6 +75,7 @@ config ARM64 select HAVE_ARCH_SECCOMP_FILTER select HAVE_ARCH_TRACEHOOK select HAVE_ARCH_TRANSPARENT_HUGEPAGE + select HAVE_ARCH_VMAP_STACK select HAVE_ARM_SMCCC select HAVE_EBPF_JIT select HAVE_C_RECORDMCOUNT |