linux-kernel - Re: [PATCH v3 1/5] tracing: add __print_flags

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Date:   Thu, 1 Dec 2016 11:53:46 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Ross Zwisler <ross.zwisler@...ux.intel.com>
Cc:     linux-kernel@...r.kernel.org,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Christoph Hellwig <hch@....de>,
        Dan Williams <dan.j.williams@...el.com>,
        Dave Chinner <david@...morbit.com>,
        Ingo Molnar <mingo@...hat.com>, Jan Kara <jack@...e.cz>,
        Matthew Wilcox <mawilcox@...rosoft.com>,
        linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
        linux-nvdimm@...ts.01.org
Subject: Re: [PATCH v3 1/5] tracing: add __print_flags_u64()

On Thu,  1 Dec 2016 09:37:47 -0700
Ross Zwisler <ross.zwisler@...ux.intel.com> wrote:

> Add __print_flags_u64() and the helper trace_print_flags_seq_u64() in the
> same spirit as __print_symbolic_u64() and trace_print_symbols_seq_u64().
> These functions allow us to print symbols associated with flags that are 64
> bits wide even on 32 bit machines.
> 
> These will be used by the DAX code so that we can print the flags set in a
> pfn_t such as PFN_SG_CHAIN, PFN_SG_LAST, PFN_DEV and PFN_MAP.
> 
> Without this new function I was getting errors like the following when
> compiling for i386:
> 
> ./include/linux/pfn_t.h:13:22: warning: large integer implicitly truncated
> to unsigned type [-Woverflow]
>  #define PFN_SG_CHAIN (1ULL << (BITS_PER_LONG_LONG - 1))
>   ^
> 
> Signed-off-by: Ross Zwisler <ross.zwisler@...ux.intel.com>

Reviewed-by: Steven Rostedt <rostedt@...dmis.org>

-- Steve