linux-kernel - Re: [PATCH-ugly] kmemtrace: casting a gfp_t requires _

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Message-Id: <1226087429.11596.53.camel@brick>
Date:	Fri, 07 Nov 2008 11:50:29 -0800
From:	Harvey Harrison <harvey.harrison@...il.com>
To:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
Cc:	Alexey Dobriyan <adobriyan@...il.com>,
	Eduard Munteanu <eduard.munteanu@...ux360.ro>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH-ugly] kmemtrace: casting a gfp_t requires __force

On Fri, 2008-11-07 at 14:38 -0500, Mathieu Desnoyers wrote:
> I think a cast
> 
> (__force unsigned) could be required for checker ?

No, that's not the way bitwise works.  Printk will treat it as an
unsigned it just fine.  bitwise will only warn if you treat the value
as anything other than a bitmask (| & ^) will be fine as long as it
is done with another gfp_t....all the arithmatic operators +-* etc
will warn.

The following looks like the correct way to fix this.

From: Harvey Harrison <harvey.harrison@...il.com>
Subject: [PATCH] kmemtrace: gfp_t is an unsigned int, not an unsigned long

Signed-off-by: Harvey Harrison <harvey.harrison@...il.com>
---
 include/linux/kmemtrace.h |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/linux/kmemtrace.h b/include/linux/kmemtrace.h
index 5bea8ea..80e9a7a 100644
--- a/include/linux/kmemtrace.h
+++ b/include/linux/kmemtrace.h
@@ -31,10 +31,10 @@ static inline void kmemtrace_mark_alloc_node(enum kmemtrace_type_id type_id,
 					     int node)
 {
 	trace_mark(kmemtrace_alloc, "type_id %d call_site %lu ptr %lu "
-		   "bytes_req %lu bytes_alloc %lu gfp_flags %lu node %d",
+		   "bytes_req %lu bytes_alloc %lu gfp_flags %u node %d",
 		   type_id, call_site, (unsigned long) ptr,
 		   (unsigned long) bytes_req, (unsigned long) bytes_alloc,
-		   (unsigned long) gfp_flags, node);
+		   gfp_flags, node);
 }
 
 static inline void kmemtrace_mark_free(enum kmemtrace_type_id type_id,
-- 
1.6.0.3.756.gb776d



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