mainlining shenanigans
95a3d4454b
The previous removal of the memblock dependency from kvmclock introduced a static data array sized 64bytes * CONFIG_NR_CPUS. That's wasteful on large systems when kvmclock is not used. Replace it with: - A static page sized array of pvclock data. It's page sized because the pvclock data of the boot cpu is mapped into the VDSO so otherwise random other data would be exposed to the vDSO - A PER_CPU variable of pvclock data pointers. This is used to access the pcvlock data storage on each CPU. The setup is done in two stages: - Early boot stores the pointer to the static page for the boot CPU in the per cpu data. - In the preparatory stage of CPU hotplug assign either an element of the static array (when the CPU number is in that range) or allocate memory and initialize the per cpu pointer. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Pavel Tatashin <pasha.tatashin@oracle.com> Acked-by: Paolo Bonzini <pbonzini@redhat.com> Cc: steven.sistare@oracle.com Cc: daniel.m.jordan@oracle.com Cc: linux@armlinux.org.uk Cc: schwidefsky@de.ibm.com Cc: heiko.carstens@de.ibm.com Cc: john.stultz@linaro.org Cc: sboyd@codeaurora.org Cc: hpa@zytor.com Cc: douly.fnst@cn.fujitsu.com Cc: peterz@infradead.org Cc: prarit@redhat.com Cc: feng.tang@intel.com Cc: pmladek@suse.com Cc: gnomes@lxorguk.ukuu.org.uk Cc: linux-s390@vger.kernel.org Cc: boris.ostrovsky@oracle.com Cc: jgross@suse.com Link: https://lkml.kernel.org/r/20180719205545.16512-8-pasha.tatashin@oracle.com |
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| arch | ||
| block | ||
| certs | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| firmware | ||
| fs | ||
| include | ||
| init | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .cocciconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| 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.
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.