On Fri, 2012-12-07 at 19:02 +0000, Will Deacon wrote: > For ARMv7, there are small subsets of instructions for ARM and Thumb which > are guaranteed to be atomic wrt concurrent modification and execution of > the instruction stream between different processors: > > Thumb: The 16-bit encodings of the B, NOP, BKPT, and SVC instructions. > ARM: The B, BL, NOP, BKPT, SVC, HVC, and SMC instructions. >
So this means for things like kprobes which can modify arbitrary kernel code we are going to need to continue to always use some form of stop_the_whole_system() function? Also, kprobes currently uses patch_text() which only uses stop_machine for Thumb2 instructions which straddle a word boundary, so this needs changing? -- Tixy -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
