[PATCH] crypto/arm64: aes-ce-cipher - move assembler code to .S file

[Herbert Xu]

On Tue, Nov 21, 2017 at 01:40:17PM +0000, Ard Biesheuvel wrote:
> Most crypto drivers involving kernel mode NEON take care to put the code
> that actually touches the NEON register file in a separate compilation
> unit, to prevent the compiler from reordering code that preserves or
> restores the NEON context with code that may corrupt it. This is
> necessary because we currently have no way to express the restrictions
> imposed upon use of the NEON in kernel mode in a way that the compiler
> understands.
> 
> However, in the case of aes-ce-cipher, it did not seem unreasonable to
> deviate from this rule, given how it does not seem possible for the
> compiler to reorder cross object function calls with asm blocks whose
> in- and output constraints reflect that it reads from and writes to
> memory.
> 
> Now that LTO is being proposed for the arm64 kernel, it is time to
> revisit this. The link time optimization may replace the function
> calls to kernel_neon_begin() and kernel_neon_end() with instantiations
> of the IR that make up its implementation, allowing further reordering
> with the asm block.
> 
> So let's clean this up, and move the asm() blocks into a separate .S
> file.
> 
> Signed-off-by: Ard Biesheuvel <ard.biesheuvel at linaro.org>

Patch applied.  Thanks.
-- 
Email: Herbert Xu <herbert at gondor.apana.org.au>
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