linux-kernel - [tip: x86/entry] x86/entry/64: Move sys_ni

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Message-ID: <158480463674.28353.6214614962833183223.tip-bot2@tip-bot2>
Date:   Sat, 21 Mar 2020 15:30:36 -0000
From:   "tip-bot2 for Brian Gerst" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Brian Gerst <brgerst@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>, x86 <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: [tip: x86/entry] x86/entry/64: Move sys_ni_syscall stub to common.c

The following commit has been merged into the x86/entry branch of tip:

Commit-ID:     cc42c045af1ff4dee875196f8fe7d6ed1f29ea64
Gitweb:        https://git.kernel.org/tip/cc42c045af1ff4dee875196f8fe7d6ed1f29ea64
Author:        Brian Gerst <brgerst@...il.com>
AuthorDate:    Fri, 13 Mar 2020 15:51:32 -04:00
Committer:     Thomas Gleixner <tglx@...utronix.de>
CommitterDate: Sat, 21 Mar 2020 16:03:20 +01:00

x86/entry/64: Move sys_ni_syscall stub to common.c

so it can be available to multiple syscall tables.  Also directly return
-ENOSYS instead of bouncing to the generic sys_ni_syscall().

Signed-off-by: Brian Gerst <brgerst@...il.com>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Link: https://lkml.kernel.org/r/20200313195144.164260-7-brgerst@gmail.com

---
 arch/x86/entry/common.c                | 7 +++++++
 arch/x86/entry/syscall_64.c            | 7 -------
 arch/x86/include/asm/syscall_wrapper.h | 3 +++
 3 files changed, 10 insertions(+), 7 deletions(-)

diff --git a/arch/x86/entry/common.c b/arch/x86/entry/common.c
index 9747876..149bf54 100644
--- a/arch/x86/entry/common.c
+++ b/arch/x86/entry/common.c
@@ -438,3 +438,10 @@ __visible long do_fast_syscall_32(struct pt_regs *regs)
 #endif
 }
 #endif
+
+#ifdef CONFIG_X86_64
+SYSCALL_DEFINE0(ni_syscall)
+{
+	return -ENOSYS;
+}
+#endif
diff --git a/arch/x86/entry/syscall_64.c b/arch/x86/entry/syscall_64.c
index adf619a..058dc1b 100644
--- a/arch/x86/entry/syscall_64.c
+++ b/arch/x86/entry/syscall_64.c
@@ -8,13 +8,6 @@
 #include <asm/asm-offsets.h>
 #include <asm/syscall.h>
 
-extern asmlinkage long sys_ni_syscall(void);
-
-SYSCALL_DEFINE0(ni_syscall)
-{
-	return sys_ni_syscall();
-}
-
 #define __SYSCALL_64(nr, sym, qual) extern asmlinkage long sym(const struct pt_regs *);
 #define __SYSCALL_X32(nr, sym, qual) __SYSCALL_64(nr, sym, qual)
 #include <asm/syscalls_64.h>
diff --git a/arch/x86/include/asm/syscall_wrapper.h b/arch/x86/include/asm/syscall_wrapper.h
index 1d96cce..0f126e4 100644
--- a/arch/x86/include/asm/syscall_wrapper.h
+++ b/arch/x86/include/asm/syscall_wrapper.h
@@ -8,6 +8,9 @@
 
 struct pt_regs;
 
+extern asmlinkage long __x64_sys_ni_syscall(const struct pt_regs *regs);
+extern asmlinkage long __ia32_sys_ni_syscall(const struct pt_regs *regs);
+
 /* Mapping of registers to parameters for syscalls on x86-64 and x32 */
 #define SC_X86_64_REGS_TO_ARGS(x, ...)					\
 	__MAP(x,__SC_ARGS						\