In message: [linux-yocto v5.10/standard/base] compile error: arch/arm64/kernel/entry.S: Error: immediate out of range at operand 3-- `and x2,x19,#(...|(1<<27))' on 12/01/2023 Li Wang wrote:
> > Hi Bruce, > > arch/arm64/kernel/entry.S: Error: immediate out of range at operand 3-- `and > x2,x19,#(...|(1<<27))' > the error only happen in arm64 preempt-rt. > > arch/arm64/include/asm/thread_info.h > #define _TIF_WORK_MASK > arch/arm64/kernel/entry.S > and x2, x19, #_TIF_WORK_MASK > > in yocto standard kernel _TIF_WORK_MASK is 8 bit, but in preempt kernel is > 9bit. > arm instructions of 'and' only includes 8 bit Immediate Data. > > in upstream standard kernel _TIF_WORK_MASK is 7 bit, preempt kernel is 8 bit. > upstream kernel removes TIF_FSCHECK flag: > https://lwn.net/ml/linux-arm-kernel/20201006144642.12195-1-mark.rutl...@arm.com/ > > so, back port the 17 patch for reduce _TIF_WORK_MASK length to match 'and' > arm instructions This did apply to v5.10/standard/base fine, but it does conflict with other merge decisions in v5.10/standard/preempt-rt/base. In particular _TIF_NEED_RESCHED_LAZY of the preempt-rt kernel is conflicting in the mask and definitions. I've manually dropped TIF_FSCHECK, and used the free slot for _TIF_NEED_RESCHED_LAZY and fixed up the masks. But it may not be correct, have a look at the v5.10/standard/preempt-rt/base merge, and send fixups as necessary. Bruce > > Thanks, > LiWang. >
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