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Under certain circumstances, the io-pgtable code may end up issuing two TLB sync operations without any intervening invalidations. This goes badly for the M4U hardware, since it means the second sync ends up polling for a non-existent operation to finish, and as a result times out and warns. The io_pgtable_tlb_* helpers implement a high-level optimisation to avoid issuing the second sync at all in such cases, but in order to work correctly that requires all pagetable operations to be serialised under a lock, thus is no longer applicable to all io-pgtable users. Since we're the only user actually relying on this flag for correctness, let's reimplement it locally to avoid the headache of trying to make the high-level version concurrency-safe for other users. CC: Yong Wu <yong.wu@mediatek.com> CC: Matthias Brugger <matthias.bgg@gmail.com> Tested-by: Yong Wu <yong.wu@mediatek.com> Signed-off-by: Robin Murphy <robin.murphy@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com> |
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arch | ||
block | ||
certs | ||
crypto | ||
Documentation | ||
drivers | ||
firmware | ||
fs | ||
include | ||
init | ||
ipc | ||
kernel | ||
lib | ||
mm | ||
net | ||
samples | ||
scripts | ||
security | ||
sound | ||
tools | ||
usr | ||
virt | ||
.cocciconfig | ||
.get_maintainer.ignore | ||
.gitattributes | ||
.gitignore | ||
.mailmap | ||
COPYING | ||
CREDITS | ||
Kbuild | ||
Kconfig | ||
MAINTAINERS | ||
Makefile | ||
README |
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. 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.