llext: Fix ARMv8-M MPU memory region alignment #98811
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ARMv8-M and newer ARC MPUs use base/limit addressing with 32-byte granularity and do not require power-of-two sizing. Only ARMv7-M and older ARC MPUs have this restriction. Check CONFIG_MPU_REQUIRES_POWER_OF_TWO_ALIGNMENT (set for ARMv7-M, older ARC) instead of CONFIG_ARM_MPU to avoid wasting memory on ARMv8-M systems. Signed-off-by: Ibrahim Abdalkader <i.abdalkader@gmail.com>
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pillo79 reviewed Nov 4, 2025
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Thanks, really didn't know such a flag existed. Huge improvement over the current situation 🥳
LGTM, but I have no ARC experience. @laurenmurphyx64, any feedback? Thanks!
laurenmurphyx64 approved these changes Nov 4, 2025
teburd approved these changes Nov 4, 2025
| Please add a reference to a bug report, so that this can be accepted to 4.3. I've also updated the milestone (if I'm wrong and this should wait for 4.4, please update the milestone accordingly) |
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ARMv8-M and newer ARC MPUs use base/limit addressing with 32-byte granularity and do not require power-of-two sizing. Only ARMv7-M and older ARC MPUs have this restriction.
Check
CONFIG_MPU_REQUIRES_POWER_OF_TWO_ALIGNMENT(set for ARMv7-M, older ARC) instead ofCONFIG_ARM_MPUto avoid wasting memory on ARMv8-M systems.This is something I noticed while looking at the llext code. If you don’t want to modify that critical code, feel free to close it.