[PATCH] m68k: correct setting of struct user.u_ar0

From: Geert Uytterhoeven
Date: Thu Feb 07 2008 - 17:10:49 EST


Commit 6e16d89bcd668a95eb22add24c02d80890232b66

Sanitize the type of struct user.u_ar0

struct user.u_ar0 is defined to contain a pointer offset on all
architectures in which it is defined (all architectures which define an
a.out format except SPARC.) However, it has a pointer type in the headers,
which is pointless -- <asm/user.h> is not exported to userspace, and it
just makes the code messy.

Redefine the field as "unsigned long" (which is the same size as a pointer
on all Linux architectures) and change the setting code to user offsetof()
instead of hand-coded arithmetic.

forgot to change the m68k setting code, causing the following compiler warning:

arch/m68k/kernel/process.c:338: warning: assignment makes integer from pointer without a cast

Signed-off-by: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
---
arch/m68k/kernel/process.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/m68k/kernel/process.c
+++ b/arch/m68k/kernel/process.c
@@ -335,7 +335,7 @@ void dump_thread(struct pt_regs * regs,
if (dump->start_stack < TASK_SIZE)
dump->u_ssize = ((unsigned long) (TASK_SIZE - dump->start_stack)) >> PAGE_SHIFT;

- dump->u_ar0 = (struct user_regs_struct *)((int)&dump->regs - (int)dump);
+ dump->u_ar0 = offsetof(struct user, regs);
sw = ((struct switch_stack *)regs) - 1;
dump->regs.d1 = regs->d1;
dump->regs.d2 = regs->d2;

Gr{oetje,eeting}s,

Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
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