From: Peter Zijlstra <peterz@infradead.org>
To: linux-kernel@vger.kernel.org
Cc: Dave Hansen <dave.hansen@linux.intel.com>,
Andy Lutomirski <luto@kernel.org>, Ingo Molnar <mingo@kernel.org>,
Borislav Petkov <bp@alien8.de>, Brian Gerst <brgerst@gmail.com>,
Denys Vlasenko <dvlasenk@redhat.com>,
"H. Peter Anvin" <hpa@zytor.com>,
Josh Poimboeuf <jpoimboe@redhat.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
Peter Zijlstra <peterz@infradead.org>,
Rik van Riel <riel@redhat.com>,
daniel.gruss@iaik.tugraz.at, hughd@google.com,
keescook@google.com, linux-mm@kvack.org,
michael.schwarz@iaik.tugraz.at, moritz.lipp@iaik.tugraz.at,
richard.fellner@student.tugraz.at
Subject: [PATCH 3/5] x86/mm/kaiser: Revert ("Map the entry stack variables")
Date: Mon, 27 Nov 2017 23:31:13 +0100 [thread overview]
Message-ID: <20171127223405.280205398@infradead.org> (raw)
In-Reply-To: 20171127223110.479550152@infradead.org
[-- Attachment #1: peterz-kaiser-revert-syscall-entry-vars.patch --]
[-- Type: text/plain, Size: 1175 bytes --]
Because its not needed. The entry_SYSCALL_64 code isn't ran when
KAISER is enabled, we use entry_SYSCALL_64_trampoline instead.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
---
arch/x86/kernel/cpu/common.c | 2 +-
arch/x86/kernel/process_64.c | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -1515,7 +1515,7 @@ EXPORT_PER_CPU_SYMBOL(__preempt_count);
* the top of the kernel stack. Use an extra percpu variable to track the
* top of the kernel stack directly.
*/
-DEFINE_PER_CPU_USER_MAPPED(unsigned long, cpu_current_top_of_stack) =
+DEFINE_PER_CPU(unsigned long, cpu_current_top_of_stack) =
(unsigned long)&init_thread_union + THREAD_SIZE;
EXPORT_PER_CPU_SYMBOL(cpu_current_top_of_stack);
--- a/arch/x86/kernel/process_64.c
+++ b/arch/x86/kernel/process_64.c
@@ -59,7 +59,7 @@
#include <asm/unistd_32_ia32.h>
#endif
-__visible DEFINE_PER_CPU_USER_MAPPED(unsigned long, rsp_scratch);
+__visible DEFINE_PER_CPU(unsigned long, rsp_scratch);
/* Prints also some state that isn't saved in the pt_regs */
void __show_regs(struct pt_regs *regs, int all)
next prev parent reply other threads:[~2017-11-27 22:36 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-11-27 22:31 [PATCH 0/5] KAISER fixlets Peter Zijlstra
2017-11-27 22:31 ` [PATCH 1/5] x86/mm/kaiser: Alternative ESPFIX Peter Zijlstra
2017-11-27 22:39 ` Peter Zijlstra
2017-11-27 22:41 ` Dave Hansen
2017-11-27 22:31 ` [PATCH 2/5] x86/mm/kaiser: Add a banner Peter Zijlstra
2017-11-28 3:36 ` Andy Lutomirski
2017-11-28 5:03 ` Josh Poimboeuf
2017-11-28 5:23 ` Andy Lutomirski
2017-11-28 12:54 ` Borislav Petkov
2017-11-27 22:31 ` Peter Zijlstra [this message]
2017-11-27 22:31 ` [PATCH 4/5] x86/mm/kaiser: Remove superfluous SWITCH_TO_KERNEL Peter Zijlstra
2017-11-27 22:47 ` Dave Hansen
2017-11-27 22:53 ` Peter Zijlstra
2017-11-27 22:31 ` [PATCH 5/5] x86/mm/kaiser: Disable the SYSCALL-64 trampoline along with KAISER Peter Zijlstra
2017-11-27 22:53 ` Dave Hansen
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