Re: [PATCH v5 3/6] x86/arch_prctl Add a new do_arch_prctl

Add a new do_arch_prctl to handle arch_prctls that are not specific to 64
bits. Call it from the syscall entry point, but not any of the other
callsites in the kernel, which all want one of the existing 64 bit only
arch_prctls.

Signed-off-by: Kyle Huey <khuey-OhBmq/TcCDJWk0Htik3J/w@public.gmane.org>
---
 arch/x86/include/asm/proto.h | 1 +
 arch/x86/kernel/process.c    | 5 +++++
 arch/x86/kernel/process_64.c | 8 +++++++-
 3 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/arch/x86/include/asm/proto.h b/arch/x86/include/asm/proto.h
index 95c3e51..94a57cc 100644
--- a/arch/x86/include/asm/proto.h
+++ b/arch/x86/include/asm/proto.h

@@ -30,6 +30,7 @@ void x86_report_nx(void);

 extern int reboot_force;

+long do_arch_prctl(struct task_struct *task, int code, unsigned long arg2);
 #ifdef CONFIG_X86_64
 long do_arch_prctl_64(struct task_struct *task, int code, unsigned long arg2);
 #endif

diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c
index 62c0b0e..97aa104 100644
--- a/arch/x86/kernel/process.c
+++ b/arch/x86/kernel/process.c

@@ -567,3 +567,8 @@ unsigned long get_wchan(struct task_struct *p)
        } while (count++ < 16 && p->state != TASK_RUNNING);
        return 0;
 }
+
+long do_arch_prctl(struct task_struct *task, int code, unsigned long arg2)
+{
+       return -EINVAL;
+}