Differential D54840

sys: Use __is_aligned and __align_down for some kstack alignment operations
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Authored by jhb on Jan 23 2026, 6:45 PM.

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jhibbits
adrian
fuz
kib

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rG093fffa296d0: sys: Use __is_aligned and __align_down for some kstack alignment operations

Summary

Effort: CHERI upstreaming
Sponsored by: AFRL, DARPA

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rG FreeBSD src repository

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Event Timeline

jhb created this revision.Jan 23 2026, 6:45 PM

Herald added a subscriber: imp. · View Herald TranscriptJan 23 2026, 6:45 PM

jhb requested review of this revision.Jan 23 2026, 6:45 PM

Herald added a reviewer: cheri. · View Herald TranscriptJan 23 2026, 6:45 PM

Harbormaster completed remote builds in B70078: Diff 170283.Jan 23 2026, 6:45 PM

jhb added a parent revision: D54839: powerpc: Fix alignment of initial PCB on kstack.Jan 23 2026, 6:45 PM

jhb added a reviewer: kib.Jan 23 2026, 6:46 PM

kib accepted this revision.Jan 23 2026, 6:50 PM

This revision is now accepted and ready to land.Jan 23 2026, 6:50 PM

Note: you can test this for ppc64 by using power8/power9 VMs:

https://wiki.freebsd.org/powerpc/QEMU/Pseries8

https://wiki.freebsd.org/powerpc/QEMU/Pseries9

(I'm still working on fixing up what's broken for ppc970 (g5) and powerpc 32 bit on g3/g4 CPUs in QEMU)

jhibbits accepted this revision.Jan 25 2026, 3:07 AM

In D54840#1253684, @adrian wrote:

Note: you can test this for ppc64 by using power8/power9 VMs:

https://wiki.freebsd.org/powerpc/QEMU/Pseries8

https://wiki.freebsd.org/powerpc/QEMU/Pseries9

(I'm still working on fixing up what's broken for ppc970 (g5) and powerpc 32 bit on g3/g4 CPUs in QEMU)

I only really tested that this compiled for powerpc. These are some fixes I found while working on some larger tree-sweeps for CHERI that involve replacing vm_offset_t with void * in various APIs.

Closed by commit rG093fffa296d0: sys: Use __is_aligned and __align_down for some kstack alignment operations (authored by jhb). · Explain WhyJan 27 2026, 6:32 PM

This revision was automatically updated to reflect the committed changes.

jhb added a commit: rG093fffa296d0: sys: Use __is_aligned and __align_down for some kstack alignment operations.

Revision Contents
Changeset List

Path

Size

sys/

amd64/

amd64/

3 lines

i386/

i386/

3 lines

powerpc/

powerpc/

4 lines

5 lines

4 lines

Diff 170546

sys/amd64/amd64/vm_machdep.c

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sys/i386/i386/vm_machdep.c

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sys/powerpc/powerpc/exec_machdep.c

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sys/powerpc/powerpc/machdep.c

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sys/powerpc/powerpc/vm_machdep.c

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