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kconfig: Rename CONFIG_FLOAT to CONFIG_FPU

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This commit renames the Kconfig `FLOAT` symbol to `FPU`, since this
symbol only indicates that the hardware Floating Point Unit (FPU) is
used and does not imply and/or indicate the general availability of
toolchain-level floating point support (i.e. this symbol is not
selected when building for an FPU-less platform that supports floating
point operations through the toolchain-provided software floating point
library).

Moreover, given that the symbol that indicates the availability of FPU
is named `CPU_HAS_FPU`, it only makes sense to use "FPU" in the name of
the symbol that enables the FPU.

Signed-off-by: Stephanos Ioannidis <root@stephanos.io>
This commit is contained in:
Stephanos Ioannidis 2020-04-23 17:27:24 +09:00 • committed by Carles Cufí
commit 0e6ede8929
56 changed files with 114 additions and 115 deletions
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8
arch/x86/core/Kconfig.ia32
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@ -80,7 +80,7 @@ depends on CPU_HAS_FPU
config SSE
bool "SSE registers"
depends on FLOAT
depends on FPU
help
This option enables the use of SSE registers by threads.
@ -100,7 +100,7 @@ config SSE_FP_MATH
config EAGER_FP_SHARING
bool
depends on FLOAT
depends on FPU
depends on USERSPACE
default y if !X86_NO_LAZY_FP
help
@ -110,12 +110,12 @@ config EAGER_FP_SHARING
Mitigates CVE-2018-3665, but incurs a performance hit.
For vulnerable systems that process sensitive information in the
FPU register set, should be used any time CONFIG_FLOAT is
FPU register set, should be used any time CONFIG_FPU is
enabled, regardless if the FPU is used by one thread or multiple.
config LAZY_FP_SHARING
bool
depends on FLOAT
depends on FPU
depends on !EAGER_FP_SHARING
depends on FP_SHARING
default y if X86_NO_LAZY_FP || !USERSPACE