Re: [Xen-devel] [RFC PATCH 4/8] gcov: add new interface and 3.4 and 4.7 format support

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Fri, Oct 07, 2016 at 12:10:25PM +0100, Wei Liu wrote:
> On Fri, Oct 07, 2016 at 05:06:42AM -0600, Jan Beulich wrote:
> > >>> On 06.10.16 at 16:37, <wei.liu2@xxxxxxxxxx> wrote:
> > > A new sysctl interface for passing gcov data back to userspace. The new
> > > interface uses a customised record file format. The new sysctl reuses
> > > original sysctl number but renames the op to gcov_op.
> > > 
> > > Both gcc 3.4 and 4.7 format are supported. The code is rewritten so that
> > > a new format can be easily added in the future.  Version specific code
> > > is grouped into different files. The format one needs to use can be
> > > picked via Kconfig. The default format is 4.7 format.
> > > 
> > > Userspace programs to handle extracted data will come in a later patch.
> > > 
> > > Signed-off-by: Wei Liu <wei.liu2@xxxxxxxxxx>
> > 
> > Looks reasonable, but wants some cosmetics done: Constification
> > seems to b possible in a number of places, labels should be
> > indented by at least one blank, and pointless initializers would be
> > nice to see eliminated. Also, unless at least the removal patch is
> > still meant to go in for 4.8, you'll need to bump
> > XEN_SYSCTL_INTERFACE_VERSION in the patch here.
> > 
> 
> Regarding cosmetic issues, I will try to fix as many as possible.
> 
> The removal patch won't go in 4.8 because though the implementation has
> a lot of limitations it might still be useful to some people. I will
> bump XEN_SYSCTL_INTERFACE_VERSION here in this patch.
> 

I go through most (if not all) initialisers, actually they are necessary:

1. those accumulative counters need to be initialised to 0.
2. gcov_info_next expects NULL for first invocation.

Wei.

> Wei.
> 
> > Jan
> > 

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