From: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Date: Wed, 21 Sep 2005 16:40:29 +0000 (+0200)
Subject: [PATCH] uml: comment about cast build fix
X-Git-Tag: upstream/snapshot3+hdmi~45697
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=a46c9047642d70f5619e4a14129d74dd1f6ea74f;p=platform%2Fadaptation%2Frenesas_rcar%2Frenesas_kernel.git

[PATCH] uml: comment about cast build fix

Explain why the casting we do to silence this warning is indeed safe.

It is because the field we're casting from, though being 64-bit wide, was filled
with a pointer in first place by ourselves.

Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

diff --git a/arch/um/os-Linux/aio.c b/arch/um/os-Linux/aio.c
index 298d563..f6e6402 100644
--- a/arch/um/os-Linux/aio.c
+++ b/arch/um/os-Linux/aio.c
@@ -144,6 +144,7 @@ static int aio_thread(void *arg)
                                "errno = %d\n", errno);
                 }
                 else {
+			/* This is safe as we've just a pointer here. */
 			aio = (struct aio_context *) (long) event.data;
 			if(update_aio(aio, event.res)){
 				do_aio(ctx, aio);