Re: [PATCH 5/5] lib: Add error string support to printks

[Joe Perches]

On Tue, 2013-09-17 at 18:08 -0500, danielfsantos@xxxxxxx wrote:
> This adds an extension for the integral format specifier suffix of 'e',
> so that the format %[duxXo]e will result in printing an number (as
> before) in addition to a name and descrption for an error code, if such
> support is enabled and a name and descrption is found.
> 
> My initial thought was to use the glibc extension of '%m', but this
> format specifier uses the value of libc's errno and adding a value
> breaks gcc's printf parsing.  I'm not convinced that the 'e' extension
> is optimal, although there are only four instances of this pattern in
> the kernel that would need to be changed.
> 
>     git grep -E '".*%[#0\ +\-]*[0-9]*[hljzt]*[idoxXu]e'
> 
> Alternatively, 'E' was another thought for a suffix as well.

I'd much rather see another %p extension used instead
of generating odd output given normal printf formats.

%pE might work


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