x86, um: sanitize uml sigcontext.h uses

a) the only difference between sigcontext and sysdep/sigcontext
is that the former contains externs for two long-dead functions.
Removed, switched the only user to sysdep/sigcontext

b) asm/sigcontext.h is removable - that of underlying architecture
would get used.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>

arch/um/Makefile

@@ -19,7 +19,7 @@ core-y			+= $(ARCH_DIR)/kernel/		\
 			   $(ARCH_DIR)/os-$(OS)/
 
 # Have to precede the include because the included Makefiles reference them.
-SYMLINK_HEADERS := archparam.h system.h sigcontext.h processor.h ptrace.h \
+SYMLINK_HEADERS := archparam.h system.h processor.h ptrace.h \
 	module.h vm-flags.h elf.h host_ldt.h
 SYMLINK_HEADERS := $(foreach header,$(SYMLINK_HEADERS),$(ARCH_DIR)/include/asm/$(header))
 

arch/um/include/asm/sigcontext-generic.h

-#ifndef __UM_SIGCONTEXT_GENERIC_H
-#define __UM_SIGCONTEXT_GENERIC_H
-
-#include "asm/arch/sigcontext.h"
-
-#endif

arch/um/include/asm/sigcontext-i386.h

-#ifndef __UM_SIGCONTEXT_I386_H
-#define __UM_SIGCONTEXT_I386_H
-
-#include "asm/sigcontext-generic.h"
-
-#endif

arch/um/include/asm/sigcontext-ppc.h

-#ifndef __UM_SIGCONTEXT_PPC_H
-#define __UM_SIGCONTEXT_PPC_H
-
-#define pt_regs sys_pt_regs
-
-#include "asm/sigcontext-generic.h"
-
-#undef pt_regs
-
-#endif

arch/um/include/asm/sigcontext-x86_64.h

-/* Copyright 2003 PathScale, Inc.
- *
- * Licensed under the GPL
- */
-
-#ifndef __UM_SIGCONTEXT_X86_64_H
-#define __UM_SIGCONTEXT_X86_64_H
-
-#include "asm/sigcontext-generic.h"
-
-#endif
-
-/*
- * Overrides for Emacs so that we follow Linus's tabbing style.
- * Emacs will notice this stuff at the end of the file and automatically
- * adjust the settings for this buffer only.  This must remain at the end
- * of the file.
- * ---------------------------------------------------------------------------
- * Local variables:
- * c-file-style: "linux"
- * End:
- */

arch/um/include/shared/sigcontext.h

-/* 
- * Copyright (C) 2001, 2002 Jeff Dike (jdike@karaya.com)
- * Licensed under the GPL
- */
-
-#ifndef __UML_SIGCONTEXT_H__
-#define __UML_SIGCONTEXT_H__
-
-#include "sysdep/sigcontext.h"
-
-extern int sc_size(void *data);
-extern void sc_to_sc(void *to_ptr, void *from_ptr);
-
-#endif
-
-/*
- * Overrides for Emacs so that we follow Linus's tabbing style.
- * Emacs will notice this stuff at the end of the file and automatically
- * adjust the settings for this buffer only.  This must remain at the end
- * of the file.
- * ---------------------------------------------------------------------------
- * Local variables:
- * c-file-style: "linux"
- * End:
- */

arch/um/kernel/signal.c

@@ -11,7 +11,7 @@
 #include <asm/unistd.h>
 #include "frame_kern.h"
 #include "kern_util.h"
-#include "sigcontext.h"
+#include <sysdep/sigcontext.h>
 
 EXPORT_SYMBOL(block_signals);
 EXPORT_SYMBOL(unblock_signals);