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authorArd Biesheuvel <ard.biesheuvel@linaro.org>2013-05-16 11:41:48 +0200
committerArd Biesheuvel <ard.biesheuvel@linaro.org>2013-07-08 22:08:51 +0100
commit73c132c15da504789b924871e2491479a18e4f6a (patch)
treee5aab4cb0d9263419677a4aa9aea392ffad76053 /fs/cifs/smb2file.c
parentab3da15643469ab2d206dee3d9cfa4194ba77f25 (diff)
ARM: add support for kernel mode NEON
In order to safely support the use of NEON instructions in kernel mode, some precautions need to be taken: - the userland context that may be present in the registers (even if the NEON/VFP is currently disabled) must be stored under the correct task (which may not be 'current' in the UP case), - to avoid having to keep track of additional vfpstates for the kernel side, disallow the use of NEON in interrupt context and run with preemption disabled, - after use, re-enable preemption and re-enable the lazy restore machinery by disabling the NEON/VFP unit. This patch adds the functions kernel_neon_begin() and kernel_neon_end() which take care of the above. It also adds the Kconfig symbol KERNEL_MODE_NEON to enable it. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Acked-by: Nicolas Pitre <nico@linaro.org>
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