diff options
| author |   Will Deacon <will@kernel.org> | 2022-06-09 13:12:21 +0100 |
|---|---|---|
| committer |   Marc Zyngier <maz@kernel.org> | 2022-06-09 13:24:02 +0100 |
| commit | 112f3bab41113dc53b4f35e9034b2208245bc002 (patch) | |
| tree | 7bbdd3565698eed5fe07bd5fee2a7ea0975d4f96 /arch/arm64 | |
| parent | KVM: arm64: Ignore 'kvm-arm.mode=protected' when using VHE (diff) | |
| download | linux-dev-112f3bab41113dc53b4f35e9034b2208245bc002.tar.xz linux-dev-112f3bab41113dc53b4f35e9034b2208245bc002.zip | |
KVM: arm64: Extend comment in has_vhe()
has_vhe() expands to a compile-time constant when evaluated from the VHE
or nVHE code, alternatively checking a static key when called from
elsewhere in the kernel. On face value, this looks like a case of
premature optimization, but in fact this allows symbol references on
VHE-specific code paths to be dropped from the nVHE object.
Expand the comment in has_vhe() to make this clearer, hopefully
discouraging anybody from simplifying the code.
Cc: David Brazdil <dbrazdil@google.com>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20220609121223.2551-5-will@kernel.org
Diffstat (limited to 'arch/arm64')
| -rw-r--r-- | arch/arm64/include/asm/virt.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/virt.h b/arch/arm64/include/asm/virt.h index 3c8af033a997..0e80db4327b6 100644 --- a/arch/arm64/include/asm/virt.h +++ b/arch/arm64/include/asm/virt.h @@ -113,6 +113,9 @@ static __always_inline bool has_vhe(void) /* * Code only run in VHE/NVHE hyp context can assume VHE is present or * absent. Otherwise fall back to caps. + * This allows the compiler to discard VHE-specific code from the + * nVHE object, reducing the number of external symbol references + * needed to link. */ if (is_vhe_hyp_code()) return true; |