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Differential D36966

linuxkpi: Add `cmpxchg64()` in <asm/atomic.h>
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Authored by dumbbell on Oct 12 2022, 7:23 PM.
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Subscribers
emaste
• hselasky
imp
linuxkpi

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Reviewers
manu
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linuxkpi
Commits
rGe279c1fcfafb: linuxkpi: Add `cmpxchg64()` in <asm/atomic.h>
rGe79a57d4ecb7: linuxkpi: Add `cmpxchg64()` in <asm/atomic.h>
Summary

I defined it as an alias to cmpxchg(), not sure it is correct...

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rG FreeBSD src repository
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Event Timeline

dumbbell created this revision.Oct 12 2022, 7:23 PM
Herald added subscribers: linuxkpi, emaste, imp. · View Herald TranscriptOct 12 2022, 7:23 PM
dumbbell requested review of this revision.Oct 12 2022, 7:23 PM
Harbormaster completed remote builds in B47814: Diff 111736.Oct 12 2022, 7:23 PM
dumbbell mentioned this in D36869: This patch contains [[ https://github.com/dumbbell/freebsd-src/tree/linuxkpi-changes-for-drm-from-5.11 | a series of commits to linuxkpi ]] in order to support an update of the DRM drivers to match Linux 5.11:.Oct 12 2022, 7:32 PM
dumbbell added a comment.Oct 12 2022, 7:36 PM

I'm not sure about making cmpxchg64() an alias of cmpxchg(). It will probably break on 32bit archs.

manu added a comment.Oct 14 2022, 8:35 AM
In D36966#839564, @dumbbell wrote:

I'm not sure about making cmpxchg64() an alias of cmpxchg(). It will probably break on 32bit archs.

I think so too.

manu added a reviewer: linuxkpi.Oct 14 2022, 8:35 AM
• hselasky added a subscriber: • hselasky.Oct 16 2022, 1:00 PM
• hselasky added inline comments.
sys/compat/linuxkpi/common/include/asm/atomic.h
221

It's only defined for selected platforms. And will compile time assert if not present!

Should be OK.

manu accepted this revision.Dec 1 2022, 1:26 PM
manu added inline comments.
sys/compat/linuxkpi/common/include/asm/atomic.h
221

Yes indeed.

This revision is now accepted and ready to land.Dec 1 2022, 1:26 PM
Closed by commit rGe79a57d4ecb7: linuxkpi: Add `cmpxchg64()` in <asm/atomic.h> (authored by dumbbell, committed by manu). · Explain WhyDec 1 2022, 2:05 PM
This revision was automatically updated to reflect the committed changes.
manu added a commit: rGe79a57d4ecb7: linuxkpi: Add `cmpxchg64()` in <asm/atomic.h>.
manu added a commit: rGe279c1fcfafb: linuxkpi: Add `cmpxchg64()` in <asm/atomic.h>.Jan 24 2023, 8:56 AM

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sys/
compat/
linuxkpi/
common/
include/
asm/
1 line

Diff 113745

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sys/compat/linuxkpi/common/include/asm/atomic.h

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