diff options
author | Ard Biesheuvel <ard.biesheuvel@linaro.org> | 2013-05-16 11:41:48 +0200 |
---|---|---|
committer | Ard Biesheuvel <ard.biesheuvel@linaro.org> | 2013-07-08 22:08:51 +0100 |
commit | 73c132c15da504789b924871e2491479a18e4f6a (patch) | |
tree | e5aab4cb0d9263419677a4aa9aea392ffad76053 /fs/cifs/smb2file.c | |
parent | ab3da15643469ab2d206dee3d9cfa4194ba77f25 (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>
Diffstat (limited to 'fs/cifs/smb2file.c')
0 files changed, 0 insertions, 0 deletions