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aef7457540
- fix arch_memremap_can_ram_remap() which incorrectly passed a PFN to memblock_is_map_memory rather than the actual address. - "Disallow kernel mode NEON when IRQs are disabled" - this needs a better explanation. "To avoid having to preserve/restore kernel mode NEON state when such a softirq is taken softirqs are now disabled when using the NEON from task context." should explain that it's nested kernel mode. In other words, softirqs from user mode are fine, because the context will be preserved. softirqs from kernel mode may be from a context that has already saved the user NEON state, and thus we would need to preserve the NEON state for the parent kernel mode context, and this we don't allow. The problem occurs when the kernel context disables hard IRQs, and then uses NEON. When it's finished, and restores the userspace NEON state, we call local_bh_enable() with hard IRQs disabled, which causes a warning. This commit addresses that by disallowing the use of NEON with hard IRQs disabled. https://lore.kernel.org/all/20250516231858.27899-4-ebiggers@kernel.org/T/#m104841b6e9346b1814c8b0fb9f2340551b0cd3e8 has some further context. -----BEGIN PGP SIGNATURE----- iQIzBAABCgAdFiEEuNNh8scc2k/wOAE+9OeQG+StrGQFAmg9k5MACgkQ9OeQG+St rGTsIg//R8AysyZIHWCzO+j7UFZPQ+jUZ0Qf0NMA3Ss/Bh724BtDWIMRo30/ADtX nwJhGnFVenr9jdGuUBmE8R25QyfZIz2U45hGVqUgSL9W96A8PPsuaR7oXhvezq68 Wj+UUTzem4l1bgK416qEROPgY/dtYCL5AbPA+SdH+LSMvS9phkhT6PkGJRC14tZ9 kLNR4PyA9/DC6N6wIU8v9pWezSoOBn/ISBpb67BB0OzZPlmgoJJOXbSNzIHaJc4C YjjJCHRmZL2w/U4HyEc8qXyHMPggEKtDas6mwrpxV/fjoReC/vk3tvuRxy1Mt1Ny BIIOA/Hauz8O9+aqfdqABK92tMiLx7NA9bWQDndIisfD/nRFyrpFDUbw1+d4EemU qzDmKSNWK9nsC28kE8F5M4XLacHu4AQN10Ktjr5LXGoMmPfDz0xssd2uDJkbL4Zq wHVea4HPX8Ykrv6yg+iRZp54z25+ckD+kf93zhutabaa/zVdAHAU9Lk/Uqm2G1R2 5huER0vvLJF3+mYu9mRjodssOUsEVwPbBuGiwJ7DY2a6faexuJv/sU5ZyHhwHb/B TjaYbektcllYWly+KN33XzZXuVVpY9DbRq/2MCFbxMYjHxGjj7QiytTm8tI6VX26 yi8CQ+8/0SXoBPaDjb2y4n6qIxcjiBcdQ8DxDbA9Od0glzJQUhE= =V4ew -----END PGP SIGNATURE----- Merge tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rmk/linux Pull ARM fixes from Russell King: - Fix arch_memremap_can_ram_remap() which incorrectly passed a PFN to memblock_is_map_memory rather than the actual address. - Disallow kernel mode NEON when IRQs are disabled Explanation: "To avoid having to preserve/restore kernel mode NEON state when such a softirq is taken softirqs are now disabled when using the NEON from task context." should explain that it's nested kernel mode. In other words, softirqs from user mode are fine, because the context will be preserved. softirqs from kernel mode may be from a context that has already saved the user NEON state, and thus we would need to preserve the NEON state for the parent kernel mode context, and this we don't allow. The problem occurs when the kernel context disables hard IRQs, and then uses NEON. When it's finished, and restores the userspace NEON state, we call local_bh_enable() with hard IRQs disabled, which causes a warning. This commit addresses that by disallowing the use of NEON with hard IRQs disabled. https://lore.kernel.org/all/20250516231858.27899-4-ebiggers@kernel.org/T/#m104841b6e9346b1814c8b0fb9f2340551b0cd3e8 has some further context * tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rmk/linux: ARM: 9446/1: Disallow kernel mode NEON when IRQs are disabled ARM: 9447/1: arm/memremap: fix arch_memremap_can_ram_remap() |
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.