PSA for packagers and other ARM distros: Linux v6.9 added support for CONFIG_ARM64_PA_BITS_52 with 4K and 16K page sizes (LPA2). Do not enable this with 16K page size kernel builds, as this combination is completely broken upstream for machines without LPA2 support (you will get random oopses, even though that's supposed to work and fall back gracefully to 47-bit addresses).
Kind of silly that nobody upstream tested this code with 16K pages, as FEAT_LPA2 is all about 4K and 16K page systems specifically, but oh well. C'est la vie.
Hector Martin /
npub1qk…9azpx
2024-07-18 12:24:44
Author Public Key
npub1qk9x6yrvten3jqyvundn7exggm90fxf9yfarj5eaz25yd7aty8hqe9azpxPublished at
2024-07-18 12:24:44Event JSON
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"content": "PSA for packagers and other ARM distros: Linux v6.9 added support for CONFIG_ARM64_PA_BITS_52 with 4K and 16K page sizes (LPA2). Do not enable this with 16K page size kernel builds, as this combination is completely broken upstream for machines without LPA2 support (you will get random oopses, even though that's supposed to work and fall back gracefully to 47-bit addresses).\n\nKind of silly that nobody upstream tested this code with 16K pages, as FEAT_LPA2 is all about 4K and 16K page systems specifically, but oh well. C'est la vie.",
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