[amd64] clean PRSTATUS_SIZE/SET_PR_FPVALID up properly

To get rid of hardcoded size/offset in those macros we need to have
a definition of i386 variant of struct elf_prstatus.  However, we can't
do that in asm/compat.h - the types needed for that are not there and
adding an include of asm/user32.h into asm/compat.h would cause a lot
of mess.

That could be conveniently done in elfcore-compat.h, but currently there
is nowhere to put arch-dependent parts of it - no asm/elfcore-compat.h.
So we introduce a new file (asm/elfcore-compat.h, present on architectures
that have CONFIG_ARCH_HAS_ELFCORE_COMPAT set, currently only on x86),
have it pulled by linux/elfcore-compat.h and move the definitions there.

As a side benefit, we don't need to worry about accidental inclusion of
that file into binfmt_elf.c itself, so we don't need the dance with
COMPAT_PRSTATUS_SIZE, etc. - only fs/compat_binfmt_elf.c will see
that header.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 11 insertions, 7 deletions

diff --git a/include/linux/elfcore-compat.h b/include/linux/elfcore-compat.h
index 4aeda5f1f038..e272c3d452ce 100644
--- a/include/linux/elfcore-compat.h
+++ b/include/linux/elfcore-compat.h
@@ -33,13 +33,6 @@ struct compat_elf_prstatus_common
 	struct old_timeval32		pr_cstime;
 };
 
-struct compat_elf_prstatus
-{
-	struct compat_elf_prstatus_common	common;
-	compat_elf_gregset_t		pr_reg;
-	compat_int_t			pr_fpvalid;
-};
-
 struct compat_elf_prpsinfo
 {
 	char				pr_state;
@@ -54,4 +47,15 @@ struct compat_elf_prpsinfo
 	char				pr_psargs[ELF_PRARGSZ];
 };
 
+#ifdef CONFIG_ARCH_HAS_ELFCORE_COMPAT
+#include <asm/elfcore-compat.h>
+#endif
+
+struct compat_elf_prstatus
+{
+	struct compat_elf_prstatus_common	common;
+	compat_elf_gregset_t		pr_reg;
+	compat_int_t			pr_fpvalid;
+};
+
 #endif /* _LINUX_ELFCORE_COMPAT_H */