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ec28bb9c9b
arm64 requires break-before-make. Originally, before
setting up new pmd/pud entry for huge mapping, in few
cases, the modifying pmd/pud entry was still valid
and pointing to next level page table as we only
clear off leaf PTE in unmap leg.
a) This was resulting into stale entry in TLBs (as few
TLBs also cache intermediate mapping for performance
reasons)
b) Also, modifying pmd/pud was the only reference to
next level page table and it was getting lost without
freeing it. So, page leaks were happening.
Implement pud_free_pmd_page() and pmd_free_pte_page() to
enforce BBM and also free the leaking page tables.
Implementation requires,
1) Clearing off the current pud/pmd entry
2) Invalidation of TLB
3) Freeing of the un-used next level page tables
Reviewed-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Chintan Pandya <cpandya@codeaurora.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
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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.
See Documentation/00-INDEX for a list of what is contained in each file.
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.