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

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Message-ID: <20081107192029.GA4001@x200.localdomain>
Date:	Fri, 7 Nov 2008 22:20:29 +0300
From:	Alexey Dobriyan <adobriyan@...il.com>
To:	Harvey Harrison <harvey.harrison@...il.com>
Cc:	Eduard Munteanu <eduard.munteanu@...ux360.ro>,
	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH-ugly] kmemtrace: casting a gfp_t requires __force

On Fri, Nov 07, 2008 at 10:58:41AM -0800, Harvey Harrison wrote:
> --- a/include/linux/kmemtrace.h
> +++ b/include/linux/kmemtrace.h
> @@ -34,7 +34,7 @@ static inline void kmemtrace_mark_alloc_node(enum kmemtrace_type_id type_id,
>  		   "bytes_req %lu bytes_alloc %lu gfp_flags %lu node %d",
>  		   type_id, call_site, (unsigned long) ptr,
>  		   (unsigned long) bytes_req, (unsigned long) bytes_alloc,
> -		   (unsigned long) gfp_flags, node);
> +		   (__force unsigned long)gfp_flags, node);

gfp_t is "unsigned int" actually. These casts are bogus.

Subject: How do I printk <type> correctly?

If variable is of Type	use	printk format specifier.
---------------------------------------------------------
		int			%d or %x
		unsigned int		%u or %x
		long			%ld ot %lx
		unsigned long		%lu or %lx
		long long		%lld or %llx
		unsigned long long	%llu or %llx
		size_t			%zu or %zx
		ssize_t			%zd or %zx

Raw pointer value SHOULD be printed with %p.

u64 SHOULD be printed with %llu/%llx, (unsigned long long):

	printk("%llu", (unsigned long long)u64_var);

s64 SHOULD be printed with %lld/%llx, (long long):

	printk("%lld", (long long)s64_var);

If type is dependent on config option (sector_t), use format specifier
of biggest type and explicitly cast to it.

Reminder: sizeof() result is of type size_t.

Thank you for your cooperation.

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