From: Lai Jiangshan <laijs@linux.alibaba.com>
To: linux-kernel@vger.kernel.org
Cc: Lai Jiangshan <laijs@linux.alibaba.com>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
x86@kernel.org, "H. Peter Anvin" <hpa@zytor.com>,
Andy Lutomirski <luto@kernel.org>,
Alexandre Chartre <alexandre.chartre@oracle.com>,
Peter Zijlstra <peterz@infradead.org>,
Zhenzhong Duan <zhenzhong.duan@oracle.com>,
"Eric W. Biederman" <ebiederm@xmission.com>,
Jann Horn <jannh@google.com>,
Dave Hansen <dave.hansen@linux.intel.com>
Subject: [PATCH 4/5] x86/entry: remove unused sync_regs()
Date: Wed, 27 May 2020 07:31:06 +0000 [thread overview]
Message-ID: <20200527073107.2127-5-laijs@linux.alibaba.com> (raw)
In-Reply-To: <20200527073107.2127-1-laijs@linux.alibaba.com>
No more users.
Signed-off-by: Lai Jiangshan <laijs@linux.alibaba.com>
---
arch/x86/include/asm/traps.h | 1 -
arch/x86/kernel/traps.c | 13 -------------
2 files changed, 14 deletions(-)
diff --git a/arch/x86/include/asm/traps.h b/arch/x86/include/asm/traps.h
index f5a2e438a878..20b9db7a1d49 100644
--- a/arch/x86/include/asm/traps.h
+++ b/arch/x86/include/asm/traps.h
@@ -21,7 +21,6 @@ asmlinkage void xen_page_fault(void);
dotraplinkage void do_page_fault(struct pt_regs *regs, unsigned long error_code, unsigned long address);
#ifdef CONFIG_X86_64
-asmlinkage __visible notrace struct pt_regs *sync_regs(struct pt_regs *eregs);
asmlinkage __visible notrace
struct bad_iret_stack *fixup_bad_iret(struct bad_iret_stack *s);
void __init trap_init(void);
diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c
index 3bef95934644..8291f84933ff 100644
--- a/arch/x86/kernel/traps.c
+++ b/arch/x86/kernel/traps.c
@@ -642,19 +642,6 @@ DEFINE_IDTENTRY_RAW(exc_int3)
}
#ifdef CONFIG_X86_64
-/*
- * Help handler running on a per-cpu (IST or entry trampoline) stack
- * to switch to the normal thread stack if the interrupted code was in
- * user mode. The actual stack switch is done in entry_64.S
- */
-asmlinkage __visible noinstr struct pt_regs *sync_regs(struct pt_regs *eregs)
-{
- struct pt_regs *regs = (struct pt_regs *)this_cpu_read(cpu_current_top_of_stack) - 1;
- if (regs != eregs)
- *regs = *eregs;
- return regs;
-}
-
struct bad_iret_stack {
void *error_entry_ret;
struct pt_regs regs;
--
2.20.1
next prev parent reply other threads:[~2020-05-27 7:31 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-27 7:31 [PATCH 0/5] x86/entry: simply stack switching when exception on userspace Lai Jiangshan
2020-05-27 7:31 ` [PATCH 1/5] x86/entry: introduce macro idtentry_swapgs_and_switch_to_kernel_stack Lai Jiangshan
2020-05-28 19:12 ` Thomas Gleixner
2020-05-29 8:26 ` [PATCH V2 0/4] x86/entry: simply stack switching when exception on userspace Lai Jiangshan
2020-05-29 8:26 ` [PATCH V2 1/4] x86/entry: avoid calling into sync_regs() when entering from userspace Lai Jiangshan
2020-05-29 8:26 ` [PATCH V2 2/4] x86/entry: directly switch to kernel stack when .Lerror_bad_iret Lai Jiangshan
2020-05-29 8:26 ` [PATCH V2 3/4] x86/entry: remove unused sync_regs() Lai Jiangshan
2020-05-29 8:26 ` [PATCH V2 4/4] x86/entry: don't copy to tmp in fixup_bad_iret Lai Jiangshan
2020-05-29 18:32 ` [PATCH V2 0/4] x86/entry: simply stack switching when exception on userspace Andy Lutomirski
2020-06-16 1:56 ` Lai Jiangshan
2020-06-18 13:52 ` Lai Jiangshan
2020-06-18 14:10 ` Thomas Gleixner
2020-06-27 21:03 ` Andy Lutomirski
[not found] ` <20200817062355.2884-1-jiangshanlai@gmail.com>
2020-08-17 5:31 ` [PATCH V3 0/3] " Lai Jiangshan
2020-09-10 10:12 ` Lai Jiangshan
2020-08-17 6:23 ` [PATCH V3 1/3] x86/entry: avoid calling into sync_regs() when entering from userspace Lai Jiangshan
2020-09-11 21:24 ` Jann Horn
2020-09-15 7:55 ` Lai Jiangshan
2020-08-17 6:23 ` [PATCH V3 2/3] x86/entry: directly switch to kernel stack when .Lerror_bad_iret Lai Jiangshan
2020-08-17 6:23 ` [PATCH V3 3/3] x86/entry: remove unused sync_regs() Lai Jiangshan
2020-05-27 7:31 ` [PATCH 2/5] x86/entry: avoid calling into sync_regs() when entering from userspace Lai Jiangshan
2020-05-27 7:31 ` [PATCH 3/5] x86/entry: directly switch to kernel stack when .Lerror_bad_iret Lai Jiangshan
2020-05-27 7:31 ` Lai Jiangshan [this message]
2020-05-27 7:31 ` [PATCH 5/5] x86/entry: don't copy to tmp in fixup_bad_iret Lai Jiangshan
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