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MIPS: Allow FP support to be disabled
Allow the user to configure the kernel to omit support for floating point, by setting CONFIG_MIPS_FP_SUPPORT=n. In an attempt to avoid problems for users who don't understand the impact of this, only expose the option when CONFIG_EXPERT=y. When CONFIG_MIPS_FP_SUPPORT=n all support for FPU hardware, FPU emulation & FP context will be removed from the kernel. If a userland program attempts to execute a floating point instruction it will receive a SIGILL. Setting CONFIG_MIPS_FP_SUPPORT=n shaves around 112KB from a 64r6el_defconfig build using GCC 8.1.0. This also helps prepare us for supporting the nanoMIPS ISA, for which floating point support has not been finalized. Signed-off-by: Paul Burton <paul.burton@mips.com> Patchwork: https://patchwork.linux-mips.org/patch/21014/ Cc: linux-mips@linux-mips.org
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@ -2256,7 +2256,19 @@ config CPU_GENERIC_DUMP_TLB
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default y if !(CPU_R3000 || CPU_R8000 || CPU_TX39XX)
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config MIPS_FP_SUPPORT
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def_bool y
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bool "Floating Point support" if EXPERT
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default y
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help
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Select y to include support for floating point in the kernel
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including initialization of FPU hardware, FP context save & restore
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and emulation of an FPU where necessary. Without this support any
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userland program attempting to use floating point instructions will
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receive a SIGILL.
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If you know that your userland will not attempt to use floating point
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instructions then you can say n here to shrink the kernel a little.
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If unsure, say y.
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config CPU_R2300_FPU
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bool
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