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LKMM updates for v6.7
This update adds paragraphs to the portions of memory-barriers.txt that have been marked historical due to changes in the way that the Linux kernel handles DEC Alpha. These paragraphs includes information on where to find the corresponding up-to-date information. -----BEGIN PGP SIGNATURE----- iQJHBAABCgAxFiEEbK7UrM+RBIrCoViJnr8S83LZ+4wFAmU9pYITHHBhdWxtY2tA a2VybmVsLm9yZwAKCRCevxLzctn7jEa4EACQbgAb4ZJhto4yS/P51uRuLNddSBYq aXpOJweTv5eajG/3k/e6zBIhLgjD62tCMSw57Zi7C1zZapTvILuk+AxWRWpGyV/5 IpVnSpyS3NXUi9eTdPgJ6OlZDV0xJPwEFPVcX+OBzuYtTm13+RpWxIhLtxObbUwO eERZj1el625z4xBCEvD85a68MY0pTiKrEVtlYNS2g+x44z6C9paFw/si7BXeWEDq EE2DFGptZ+CxwmGb2+9fvGR0o4SKUjTYqR5XxhYrtb9lZcn7t20MctEmXJWG+EXD ig1C7vYo7yq/i9zzvtdt/RKydPI5Fpp99G7g59se1UfOXxknUl+4ivZN1cy9gtDe +TtnHKzOExa5jI8FGdtoOLL6BBvgyQMq/IP5MIh2SV36Og+dh8aB8ejM97SQ9YhB e/ndG+Jq5oqQrqjXkIKHXt8EMjITscDIM/5ndKj4oiLGYImky/Z3yHfPisUzi+8J I3Nn8uj/VgrRA9+2Sz4a/ewuO21iqCR/RlkpEDSWgkXkeu2BHKQQrBSzIQ3RO9Tz OC4X1lgS61jxaZ/yhK5EUK5cTYSBRl+e5jGTvp1frpsw1yrx9bWcoNBQjNquEh6j ULT8EChRbhLSZiyPvd1R6EBvMozml/arzr/FdT4cMgp7ifxz+Al3YaaRPid3JXzI UZgTnS02WZ7tZA== =IGyy -----END PGP SIGNATURE----- Merge tag 'lkmm.2023.10.28a' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu Pull Linux Kernel Memory Model updates from Paul McKenney: "This update adds paragraphs to the portions of memory-barriers.txt that have been marked historical due to changes in the way that the Linux kernel handles DEC Alpha. These paragraphs includes information on where to find the corresponding up-to-date information" * tag 'lkmm.2023.10.28a' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu: docs: memory-barriers: Add note on compiler transformation and address deps
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@ -396,6 +396,10 @@ Memory barriers come in four basic varieties:
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(2) Address-dependency barriers (historical).
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[!] This section is marked as HISTORICAL: For more up-to-date
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information, including how compiler transformations related to pointer
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comparisons can sometimes cause problems, see
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Documentation/RCU/rcu_dereference.rst.
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An address-dependency barrier is a weaker form of read barrier. In the
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case where two loads are performed such that the second depends on the
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@ -556,6 +560,9 @@ There are certain things that the Linux kernel memory barriers do not guarantee:
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ADDRESS-DEPENDENCY BARRIERS (HISTORICAL)
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----------------------------------------
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[!] This section is marked as HISTORICAL: For more up-to-date information,
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including how compiler transformations related to pointer comparisons can
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sometimes cause problems, see Documentation/RCU/rcu_dereference.rst.
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As of v4.15 of the Linux kernel, an smp_mb() was added to READ_ONCE() for
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DEC Alpha, which means that about the only people who need to pay attention
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