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authorMike Rapoport <rppt@linux.vnet.ibm.com>2018-10-04 07:55:18 +1000
committerStephen Rothwell <sfr@canb.auug.org.au>2018-10-05 15:57:18 +1000
commit29e4303f8b23726cd967806fe836b2736c470a88 (patch)
treeba09ab678c3899ad326a5b0db57c09c2257b8a53
parentb1b5728d644254db8df7d995ab172990456ab6c6 (diff)
download96b-common-29e4303f8b23726cd967806fe836b2736c470a88.tar.gz
docs/boot-time-mm: remove bootmem documentation
Link: http://lkml.kernel.org/r/1536927045-23536-31-git-send-email-rppt@linux.vnet.ibm.com Signed-off-by: Mike Rapoport <rppt@linux.vnet.ibm.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Chris Zankel <chris@zankel.net> Cc: "David S. Miller" <davem@davemloft.net> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Greentime Hu <green.hu@gmail.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Guan Xuetao <gxt@pku.edu.cn> Cc: Ingo Molnar <mingo@redhat.com> Cc: "James E.J. Bottomley" <jejb@parisc-linux.org> Cc: Jonas Bonn <jonas@southpole.se> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Ley Foon Tan <lftan@altera.com> Cc: Mark Salter <msalter@redhat.com> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Matt Turner <mattst88@gmail.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Michal Hocko <mhocko@suse.com> Cc: Michal Simek <monstr@monstr.eu> Cc: Palmer Dabbelt <palmer@sifive.com> Cc: Paul Burton <paul.burton@mips.com> Cc: Richard Kuo <rkuo@codeaurora.org> Cc: Richard Weinberger <richard@nod.at> Cc: Rich Felker <dalias@libc.org> Cc: Russell King <linux@armlinux.org.uk> Cc: Serge Semin <fancer.lancer@gmail.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Tony Luck <tony.luck@intel.com> Cc: Vineet Gupta <vgupta@synopsys.com> Cc: Yoshinori Sato <ysato@users.sourceforge.jp> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
-rw-r--r--Documentation/core-api/boot-time-mm.rst69
1 files changed, 9 insertions, 60 deletions
diff --git a/Documentation/core-api/boot-time-mm.rst b/Documentation/core-api/boot-time-mm.rst
index 6e12e89a03e0..e5ec9f1a563d 100644
--- a/Documentation/core-api/boot-time-mm.rst
+++ b/Documentation/core-api/boot-time-mm.rst
@@ -5,54 +5,23 @@ Boot time memory management
Early system initialization cannot use "normal" memory management
simply because it is not set up yet. But there is still need to
allocate memory for various data structures, for instance for the
-physical page allocator. To address this, a specialized allocator
-called the :ref:`Boot Memory Allocator <bootmem>`, or bootmem, was
-introduced. Several years later PowerPC developers added a "Logical
-Memory Blocks" allocator, which was later adopted by other
-architectures and renamed to :ref:`memblock <memblock>`. There is also
-a compatibility layer called `nobootmem` that translates bootmem
-allocation interfaces to memblock calls.
+physical page allocator.
-The selection of the early allocator is done using
-``CONFIG_NO_BOOTMEM`` and ``CONFIG_HAVE_MEMBLOCK`` kernel
-configuration options. These options are enabled or disabled
-statically by the architectures' Kconfig files.
-
-* Architectures that rely only on bootmem select
- ``CONFIG_NO_BOOTMEM=n && CONFIG_HAVE_MEMBLOCK=n``.
-* The users of memblock with the nobootmem compatibility layer set
- ``CONFIG_NO_BOOTMEM=y && CONFIG_HAVE_MEMBLOCK=y``.
-* And for those that use both memblock and bootmem the configuration
- includes ``CONFIG_NO_BOOTMEM=n && CONFIG_HAVE_MEMBLOCK=y``.
-
-Whichever allocator is used, it is the responsibility of the
-architecture specific initialization to set it up in
-:c:func:`setup_arch` and tear it down in :c:func:`mem_init` functions.
+A specialized allocator called ``memblock`` performs the
+boot time memory management. The architecture specific initialization
+must set it up in :c:func:`setup_arch` and tear it down in
+:c:func:`mem_init` functions.
Once the early memory management is available it offers a variety of
functions and macros for memory allocations. The allocation request
may be directed to the first (and probably the only) node or to a
particular node in a NUMA system. There are API variants that panic
-when an allocation fails and those that don't. And more recent and
-advanced memblock even allows controlling its own behaviour.
-
-.. _bootmem:
-
-Bootmem
-=======
+when an allocation fails and those that don't.
-(mostly stolen from Mel Gorman's "Understanding the Linux Virtual
-Memory Manager" `book`_)
+Memblock also offers a variety of APIs that control its own behaviour.
-.. _book: https://www.kernel.org/doc/gorman/
-
-.. kernel-doc:: mm/bootmem.c
- :doc: bootmem overview
-
-.. _memblock:
-
-Memblock
-========
+Memblock Overview
+=================
.. kernel-doc:: mm/memblock.c
:doc: memblock overview
@@ -61,26 +30,6 @@ Memblock
Functions and structures
========================
-Common API
-----------
-
-The functions that are described in this section are available
-regardless of what early memory manager is enabled.
-
-.. kernel-doc:: mm/nobootmem.c
-
-Bootmem specific API
---------------------
-
-These interfaces available only with bootmem, i.e when ``CONFIG_NO_BOOTMEM=n``
-
-.. kernel-doc:: include/linux/bootmem.h
-.. kernel-doc:: mm/bootmem.c
- :functions:
-
-Memblock specific API
----------------------
-
Here is the description of memblock data structures, functions and
macros. Some of them are actually internal, but since they are
documented it would be silly to omit them. Besides, reading the