From: Andy Lutomirski <luto@kernel.org>
To: X86 ML <x86@kernel.org>, linux-kernel@vger.kernel.org
Cc: Steven Rostedt <rostedt@goodmis.org>, Willy Tarreau <w@1wt.eu>,
Borislav Petkov <bp@alien8.de>,
Thomas Gleixner <tglx@linutronix.de>,
Peter Zijlstra <peterz@infradead.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Andy Lutomirski <luto@kernel.org>
Subject: [PATCH 4/5] x86/entry: Only allocate space for SYSENTER_stack if needed
Date: Thu, 23 Jul 2015 08:31:42 -0700 [thread overview]
Message-ID: <a0ed6ee4bbf80b0b6cb093ea8bdc2598e0b800bd.1437665045.git.luto@kernel.org> (raw)
In-Reply-To: <cover.1437665045.git.luto@kernel.org>
In-Reply-To: <cover.1437665045.git.luto@kernel.org>
The SYSENTER stack is only used in configurations that support 32-bit
code and, hence, SYSENTER. Remove it in 64-bit non-compat configurations.
Signed-off-by: Andy Lutomirski <luto@kernel.org>
---
arch/x86/include/asm/processor.h | 2 ++
1 file changed, 2 insertions(+)
diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
index befc1341f110..786f50e4bd90 100644
--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h
@@ -298,10 +298,12 @@ struct tss_struct {
*/
unsigned long io_bitmap[IO_BITMAP_LONGS + 1];
+#if defined(CONFIG_X86_32) || defined(CONFIG_IA32_EMULATION)
/*
* Space for the temporary SYSENTER stack:
*/
unsigned long SYSENTER_stack[64];
+#endif
} ____cacheline_aligned;
--
2.4.3
next prev parent reply other threads:[~2015-07-23 15:32 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-23 15:31 [PATCH 0/5] x86: Unify SYSENTER setup and add a 64-bit SYSENTER stack Andy Lutomirski
2015-07-23 15:31 ` [PATCH 1/5] x86/entry/32: Clean up enable_sep_cpu to prepare for 64-bit merge Andy Lutomirski
2015-07-23 15:56 ` Steven Rostedt
2015-07-23 16:02 ` Andy Lutomirski
2015-07-23 17:27 ` Brian Gerst
2015-07-23 18:01 ` Andy Lutomirski
2015-07-23 18:33 ` Andy Lutomirski
2015-07-23 18:42 ` Andy Lutomirski
2015-07-23 18:50 ` Linus Torvalds
2015-07-23 15:31 ` [PATCH 2/5] x86/entry/64, entry: Set up a valid sysenter stack and prepare for 32-bit merge Andy Lutomirski
2015-07-23 16:01 ` Steven Rostedt
2015-07-23 16:04 ` Andy Lutomirski
2015-07-23 16:10 ` Steven Rostedt
2015-07-23 16:46 ` Andy Lutomirski
2015-07-23 16:59 ` Steven Rostedt
2015-07-23 15:31 ` [PATCH 3/5] x86/entry: Merge 32-bit and 64-bit sysenter setup code Andy Lutomirski
2015-07-23 16:06 ` Steven Rostedt
2015-07-23 16:45 ` Andy Lutomirski
2015-07-23 15:31 ` Andy Lutomirski [this message]
2015-07-23 15:31 ` [PATCH 5/5] x86/entry: Replace SWAPGS_UNSAFE_STACK with SWAPGS in entry_SYSENTER_compat Andy Lutomirski
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