From: Andy Lutomirski <luto@kernel.org>
To: x86@kernel.org
Cc: linux-kernel@vger.kernel.org, Borislav Petkov <bp@alien8.de>,
Oleg Nesterov <oleg@redhat.com>,
Andrew Cooper <andrew.cooper3@citrix.com>,
Brian Gerst <brgerst@gmail.com>,
Andy Lutomirski <luto@kernel.org>
Subject: [PATCH v2 08/12] x86/entry: Only allocate space for SYSENTER_stack if needed
Date: Wed, 9 Mar 2016 19:00:31 -0800 [thread overview]
Message-ID: <9dbd18429f9ff61a76b6eda97a9ea20510b9f6ba.1457578375.git.luto@kernel.org> (raw)
In-Reply-To: <cover.1457578375.git.luto@kernel.org>
In-Reply-To: <cover.1457578375.git.luto@kernel.org>
The SYSENTER stack is only used on 32-bit kernels. Remove it in
64-bit kernels.
(We may end up using it down the road on 64-bit kernels. If so,
we'll re-enable it for CONFIG_IA32_EMULATION.)
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 ecb410310e70..7cd01b71b5bd 100644
--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h
@@ -297,10 +297,12 @@ struct tss_struct {
*/
unsigned long io_bitmap[IO_BITMAP_LONGS + 1];
+#ifdef CONFIG_X86_32
/*
* Space for the temporary SYSENTER stack:
*/
unsigned long SYSENTER_stack[64];
+#endif
} ____cacheline_aligned;
--
2.5.0
next prev parent reply other threads:[~2016-03-10 3:02 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-03-10 3:00 [PATCH v2 00/12] x86: Various SYSENTER/SYSEXIT/#DB fixes and cleanups Andy Lutomirski
2016-03-10 3:00 ` [PATCH v2 01/12] selftests/x86: In syscall_nt, test NT|TF as well Andy Lutomirski
2016-03-10 11:00 ` [tip:x86/asm] " tip-bot for Andy Lutomirski
2016-03-10 3:00 ` [PATCH v2 02/12] x86/entry/compat: In SYSENTER, sink AC clearing below the existing FLAGS test Andy Lutomirski
2016-03-10 11:01 ` [tip:x86/asm] " tip-bot for Andy Lutomirski
2016-03-10 3:00 ` [PATCH v2 03/12] x86/entry/32: Filter NT and speed up AC filtering in SYSENTER Andy Lutomirski
2016-03-10 11:01 ` [tip:x86/asm] " tip-bot for Andy Lutomirski
2016-03-10 3:00 ` [PATCH v2 04/12] x86/entry/32: Restore FLAGS on SYSEXIT Andy Lutomirski
2016-03-10 11:01 ` [tip:x86/asm] " tip-bot for Andy Lutomirski
2016-03-10 3:00 ` [PATCH v2 05/12] x86/traps: Clear TIF_BLOCKSTEP on all debug exceptions Andy Lutomirski
2016-03-10 11:02 ` [tip:x86/asm] x86/entry/traps: " tip-bot for Andy Lutomirski
2016-03-10 3:00 ` [PATCH v2 06/12] x86/traps: Clear DR6 early in do_debug and improve the comment Andy Lutomirski
2016-03-10 11:02 ` [tip:x86/asm] x86/entry/traps: Clear DR6 early in do_debug() " tip-bot for Andy Lutomirski
2016-03-10 3:00 ` [PATCH v2 07/12] x86/entry: Vastly simplify SYSENTER TF handling Andy Lutomirski
2016-03-10 11:03 ` [tip:x86/asm] x86/entry: Vastly simplify SYSENTER TF (single-step) handling tip-bot for Andy Lutomirski
2016-03-10 3:00 ` Andy Lutomirski [this message]
2016-03-10 11:03 ` [tip:x86/asm] x86/entry: Only allocate space for tss_struct::SYSENTER_stack if needed tip-bot for Andy Lutomirski
2016-03-10 3:00 ` [PATCH v2 09/12] x86/entry/32: Simplify and fix up the SYSENTER stack #DB/NMI fixup Andy Lutomirski
2016-03-10 11:03 ` [tip:x86/asm] " tip-bot for Andy Lutomirski
2016-03-10 3:00 ` [PATCH v2 10/12] x86/entry/32: Add and check a stack canary for the SYSENTER stack Andy Lutomirski
2016-03-10 11:04 ` [tip:x86/asm] " tip-bot for Andy Lutomirski
2016-03-10 3:00 ` [PATCH v2 11/12] x86/entry: Remove TIF_SINGLESTEP entry work Andy Lutomirski
2016-03-10 11:04 ` [tip:x86/asm] " tip-bot for Andy Lutomirski
2016-03-10 3:00 ` [PATCH v2 12/12] x86/entry: Improve system call entry comments Andy Lutomirski
2016-03-10 11:05 ` [tip:x86/asm] " tip-bot for Andy Lutomirski
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