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592a1c6066
[ Upstream commit 989b5db215a2f22f89d730b607b071d964780f10 ] Add support for CMPXCHG loops on userspace addresses. Provide both an "unsafe" version for tight loops that do their own uaccess begin/end, as well as a "safe" version for use cases where the CMPXCHG is not buried in a loop, e.g. KVM will resume the guest instead of looping when emulation of a guest atomic accesses fails the CMPXCHG. Provide 8-byte versions for 32-bit kernels so that KVM can do CMPXCHG on guest PAE PTEs, which are accessed via userspace addresses. Guard the asm_volatile_goto() variation with CC_HAS_ASM_GOTO_TIED_OUTPUT, the "+m" constraint fails on some compilers that otherwise support CC_HAS_ASM_GOTO_OUTPUT. Cc: stable@vger.kernel.org Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Co-developed-by: Sean Christopherson <seanjc@google.com> Signed-off-by: Sean Christopherson <seanjc@google.com> Message-Id: <20220202004945.2540433-3-seanjc@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Sasha Levin <sashal@kernel.org> |
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| README | ||
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.