[PATCH v2 5/7] x86/trivial: Fix 'old_rsp' undefined build failure when including asm/compat.h

[Srikar Dronamraju <srikar@linux.vnet.ibm.com>]

From: Srikar Dronamraju <srikar@linux.vnet.ibm.com>

Including asm/compat.h in arch/x86/kernel/signal.c and compiling on a i386
machine results in old_rsp undefined build errors.

old_rsp is defined under CONFIG_X86_64. Hence add a i386 specific
arch_compat_alloc_user_space that doesnt depend on old_rsp. Will be further
cleaned up when is_ia32_compat_task is introduced.

This is pure cleanup, no functional change intended.

Signed-off-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
---
 arch/x86/include/asm/compat.h |   10 ++++++++++
 1 files changed, 10 insertions(+), 0 deletions(-)

diff --git a/arch/x86/include/asm/compat.h b/arch/x86/include/asm/compat.h
index 355edc0..ba9e9dc 100644
--- a/arch/x86/include/asm/compat.h
+++ b/arch/x86/include/asm/compat.h
@@ -221,6 +221,7 @@ static inline compat_uptr_t ptr_to_compat(void __user *uptr)
 	return (u32)(unsigned long)uptr;
 }
 
+#ifdef CONFIG_x86_64
 static inline void __user *arch_compat_alloc_user_space(long len)
 {
 	compat_uptr_t sp;
@@ -234,6 +235,15 @@ static inline void __user *arch_compat_alloc_user_space(long len)
 
 	return (void __user *)round_down(sp - len, 16);
 }
+#else
+
+static inline void __user *arch_compat_alloc_user_space(long len)
+{
+	struct pt_regs *regs = task_pt_regs(current);
+		return (void __user *)regs->sp - len;
+}
+
+#endif
 
 static inline bool is_ia32_task(void)
 {


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