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2e1f8e55f9
While using a plain (constant) address works, its use needlessly invokes a SIB addressing mode, making every call site one byte larger than necessary: ff 14 25 98 89 42 82 call *0xffffffff82428998 Instead of using an "i" constraint with address-of operator and a 'c' operand modifier, simply use an ordinary "m" constraint, which the 64-bit compiler will translate to %rip-relative addressing: ff 15 62 fb d2 00 call *0xd2fb62(%rip) # ffffffff82428998 <pv_ops+0x18> This way the compiler is also told the truth about operand usage - the memory location gets actually read, after all. 32-bit code generation is unaffected by the change. [ bp: Remove "we", add examples. ] Signed-off-by: Jan Beulich <jbeulich@suse.com> Signed-off-by: Borislav Petkov <bp@suse.de> Reviewed-by: Juergen Gross <jgross@suse.com> Link: https://lore.kernel.org/r/b8192e8a-13ef-6ac6-6364-8ba58992cd1d@suse.com |
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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.