linux_dsm_epyc7002/arch/x86/purgatory
Thomas Gleixner 40c50c1fec kexec, x86/purgatory: Unbreak it and clean it up
The purgatory code defines global variables which are referenced via a
symbol lookup in the kexec code (core and arch).

A recent commit addressing sparse warnings made these static and thereby
broke kexec_file.

Why did this happen? Simply because the whole machinery is undocumented and
lacks any form of forward declarations. The variable names are unspecific
and lack a prefix, so adding forward declarations creates shadow variables
in the core code. Aside of that the code relies on magic constants and
duplicate struct definitions with no way to ensure that these things stay
in sync. The section placement of the purgatory variables happened by
chance and not by design.

Unbreak kexec and cleanup the mess:

 - Add proper forward declarations and document the usage
 - Use common struct definition
 - Use the proper common defines instead of magic constants
 - Add a purgatory_ prefix to have a proper name space
 - Use ARRAY_SIZE() instead of a homebrewn reimplementation
 - Add proper sections to the purgatory variables [ From Mike ]

Fixes: 72042a8c7b ("x86/purgatory: Make functions and variables static")
Reported-by: Mike Galbraith <<efault@gmx.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Nicholas Mc Guire <der.herr@hofr.at>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Vivek Goyal <vgoyal@redhat.com>
Cc: "Tobin C. Harding" <me@tobin.cc>
Link: http://lkml.kernel.org/r/alpine.DEB.2.20.1703101315140.3681@nanos
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2017-03-10 20:55:09 +01:00
..
entry64.S kexec: support for kexec on panic using new system call 2014-08-08 15:57:33 -07:00
Makefile x86/kexec: add -fno-PIE 2016-11-09 22:28:09 +01:00
purgatory.c kexec, x86/purgatory: Unbreak it and clean it up 2017-03-10 20:55:09 +01:00
setup-x86_64.S kexec, x86/purgatory: Unbreak it and clean it up 2017-03-10 20:55:09 +01:00
sha256.c purgatory/sha256: provide implementation of sha256 in purgaotory context 2014-08-08 15:57:32 -07:00
sha256.h kexec, x86/purgatory: Unbreak it and clean it up 2017-03-10 20:55:09 +01:00
stack.S x86: Fix misspellings in comments 2016-02-24 08:44:58 +01:00
string.c purgatory: core purgatory functionality 2014-08-08 15:57:32 -07:00