[ARM] 3101/1: ARM EABI: slab memory must be 64-bit aligned
Patch from Nicolas Pitre Although ARM is still using 32-bit pointers, version 5 and later versions of the ARM architecture introduced the ldrd and strd instructions to move 64-bit data which must be 64-bit aligned in memory, and the EABI includes new constraints on structure data alignment to allow for the compiler to use those instructions. This means that any slab allocation must start on a 64-bit boundary which is not equivalent to BYTES_PER_WORD, especially on those architecture versions that implements the ldrd/strd instructions. Overriding the default alignment disables some slab debug features. If those debug features are really needed then the kernel will have to be compiled for version 4 of the ARM architecture. Signed-off-by: NNicolas Pitre <nico@cam.org> Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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