[tip:x86/debug] x86/Documentation: Remove STACKFAULT_STACK bulletpoint

tip-bot for Borislav Petkov
2015-05-27T14:18:21Z

Commit-ID: d724a9a52b0026ac6a05440c079c9a618acfd8cf
Gitweb: http://git.kernel.org/tip/d724a9a52b0026ac6a05440c079c9a618acfd8cf
Author: Borislav Petkov <bp@suse.de>
AuthorDate: Tue, 26 May 2015 10:28:19 +0200
Committer: Ingo Molnar <mingo@kernel.org>
CommitDate: Wed, 27 May 2015 14:39:46 +0200

x86/Documentation: Remove STACKFAULT_STACK bulletpoint

Update the documentation after

6f442be2fb22 ("x86_64, traps: Stop using IST for #SS").

Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Michal Marek <mmarek@suse.cz>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: live-patching@vger.kernel.org
Link: http://lkml.kernel.org/r/1432628901-18044-17-git-send-email-bp@alien8.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
Documentation/x86/kernel-stacks | 10 +++-------
1 file changed, 3 insertions(+), 7 deletions(-)

diff --git a/Documentation/x86/kernel-stacks b/Documentation/x86/kernel-stacks
index e3c8a49..c3c935b 100644
--- a/Documentation/x86/kernel-stacks
+++ b/Documentation/x86/kernel-stacks
@@ -1,3 +1,6 @@
+Kernel stacks on x86-64 bit
+---------------------------
+
Most of the text from Keith Owens, hacked by AK

x86_64 page size (PAGE_SIZE) is 4K.
@@ -56,13 +59,6 @@ If that assumption is ever broken then the stacks will become corrupt.

The currently assigned IST stacks are :-

-* STACKFAULT_STACK. EXCEPTION_STKSZ (PAGE_SIZE).
-
- Used for interrupt 12 - Stack Fault Exception (#SS).
-
- This allows the CPU to recover from invalid stack segments. Rarely
- happens.
-
* DOUBLEFAULT_STACK. EXCEPTION_STKSZ (PAGE_SIZE).

Used for interrupt 8 - Double Fault Exception (#DF).