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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@gmail.com>
AuthorDate: Fri, 13 Mar 2020 15:51:32 -04:00
Committer: Thomas Gleixner <tglx@linutronix.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@gmail.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.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 \
\
 
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