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List:       linux-kernel
Subject:    [patch 14/14] x86/exceptions: Enable IST guard pages
From:       Thomas Gleixner <tglx () linutronix ! de>
Date:       2019-03-31 21:40:34
Message-ID: 20190331215136.039902969 () linutronix ! de
[Download RAW message or body]

All usage sites which expected that the exception stacks in the CPU entry
area are mapped linearly are fixed up. Enable guard pages between the
IST stacks.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
 arch/x86/include/asm/cpu_entry_area.h |    8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

--- a/arch/x86/include/asm/cpu_entry_area.h
+++ b/arch/x86/include/asm/cpu_entry_area.h
@@ -25,13 +25,9 @@ struct exception_stacks {
 	ESTACKS_MEMBERS(0)
 };
 
-/*
- * The effective cpu entry area mapping with guard pages. Guard size is
- * zero until the code which makes assumptions about linear mapping is
- * cleaned up.
- */
+/* The effective cpu_entry_area mapping with guard pages */
 struct cea_exception_stacks {
-	ESTACKS_MEMBERS(0)
+	ESTACKS_MEMBERS(PAGE_SIZE)
 };
 #endif
 


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