b7b205c3a0
Because hypercall_page is page-aligned, the assembler inexplicably adds an unreachable jump from after the end of the previous code to the beginning of hypercall_page. That confuses objtool, understandably. It also creates significant text fragmentation. As a result, much of the object file is wasted text (nops). Move hypercall_page to the beginning of the file to both prevent the text fragmentation and avoid the dead jump instruction. $ size /tmp/head_64.before.o /tmp/head_64.after.o text data bss dec hex filename 10924 307252 4096 322272 4eae0 /tmp/head_64.before.o 6823 307252 4096 318171 4dadb /tmp/head_64.after.o Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: Juergen Gross <jgross@suse.com> Link: https://lkml.kernel.org/r/20210820193107.omvshmsqbpxufzkc@treble |
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| LICENSES | ||
| arch | ||
| block | ||
| certs | ||
| crypto | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| ipc | ||
| kernel | ||
| lib | ||
| 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 | ||
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.