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3578baaed4
Instead of using a bitfield, use an odd little trick using typeof, __builtin_choose_expr, and sizeof. __builtin_choose_expr is explicitly defined to not convert its type (its argument is required to be a constant expression) so this should be well-defined. The code is still not 100% preturbation-free versus the baseline before 64-bit get_user(), but the differences seem to be very small, mostly related to padding and to gcc deciding when to spill registers. Cc: Jamie Lokier <jamie@shareable.org> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com> Cc: Borislav Petkov <bp@alien8.de> Cc: Russell King <linux@arm.linux.org.uk> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: H. J. Lu <hjl.tools@gmail.com> Link: http://lkml.kernel.org/r/511A8922.6050908@zytor.com Signed-off-by: H. Peter Anvin <hpa@linux.intel.com> |
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