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b6fd9e2594
The semantics of pfn_valid() is to check presence of the memory map for a PFN and not whether a PFN is in RAM. The memory map may be present for a hole in the physical memory and if such hole corresponds to an MMIO range, __arm_ioremap_pfn_caller() will produce a WARN() and fail: Use memblock_is_map_memory() instead of pfn_valid() to check if a PFN is in RAM or not. -----BEGIN PGP SIGNATURE----- iQFHBAABCAAxFiEEeOVYVaWZL5900a/pOQOGJssO/ZEFAmDoctcTHHJwcHRAbGlu dXguaWJtLmNvbQAKCRA5A4Ymyw79kW1HCAC8lhm79EoktNw2+fumIfch15RjOGHC 8MfTSoPGJXLbwQXxBsTY8lGk8NRaLVRFDJ4OE8pMuwjCBbsgukg3oQUAbEt2n+zt DN4bCOV9vsunWs/w7S5xifFcNeeB3VqOjy2mFPaLpz3wj8fll+LtfghvHlXPyMSO xCO61F8AhsR4mUHeMmy5FRi0AG7fjYfaFrRYHqXQNAlnYqc3UgSSkfVViVEPeyOj TLefgjXkwCdrJ/84GRFkBqkXAz2vLNhic9BFt7YG2ZKbRDcAsQK5uqdmRR667edo Ca58NDOdsq3P2p+Qqum+JzWRc/F7/cGp+Twg+sA8sVvQ6Hr0TxmUNmsy =klV7 -----END PGP SIGNATURE----- Merge tag 'fixes-2021-07-09' of git://git.kernel.org/pub/scm/linux/kernel/git/rppt/memblock Pull memblock fix from Mike Rapoport: "This is a fix for the rework of ARM's pfn_valid() implementation merged during this merge window. Don't abuse pfn_valid() to check if pfn is in RAM The semantics of pfn_valid() is to check presence of the memory map for a PFN and not whether a PFN is in RAM. The memory map may be present for a hole in the physical memory and if such hole corresponds to an MMIO range, __arm_ioremap_pfn_caller() will produce a WARN() and fail. Use memblock_is_map_memory() instead of pfn_valid() to check if a PFN is in RAM or not" * tag 'fixes-2021-07-09' of git://git.kernel.org/pub/scm/linux/kernel/git/rppt/memblock: arm: ioremap: don't abuse pfn_valid() to check if pfn is in RAM |
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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 Restructured Text 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.