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[Abhinav Jain]

Sir,

Proceeding further with the memory protection project, I have read about
the IBM POWER architectures. I read about how memory management works
within the POWER architecture along with Linux kernel. I specifically, read
about POWER 8 and POWER  9 architecture and tried to understand the working
and integration with the kernel. I read about how a 78-bit address is
created in POWER 8 and also about the various sizes of page table support.
Along with this, I read about syncing process between the hardware page
table and the Linux kernel page table. I also read a little about the
Hypervisor. In POWER 9, I read about two translation modes namely,  hash
page table structure and radix page table structure. I found the working
very interesting and motivating.
I request you to please guide me, should I proceed with reading about more
architectures and MMU support in different operating systems or should I
change my approach?

Thanks and Regards
Abhinav Jain

On Tue, Feb 20, 2018 at 8:25 PM, Abhinav Jain <jainab.2009 at gmail.com> wrote:

> Sir,
>
> I have gone through the code and tried to trace out where the error is
> occurring. I also read about the git status command and the problem which I
> was able to figure out from this was with the git status command only.
> I discussed this with Chris sir and he suggested me to make a different
> function to check the presence of the .git file and in place of checking
> the validity of path everywhere, this function is to be called as this
> provides a surety that the git status is not reflecting the status of a
> parent directory.
>
> Thanks and Regards
> Abhinav Jain
>
> On Tue, Feb 20, 2018 at 7:22 PM, Gedare Bloom <gedare at rtems.org> wrote:
>
>> On Sun, Feb 18, 2018 at 3:19 AM, Abhinav Jain <jainab.2009 at gmail.com>
>> wrote:
>> > Sir,
>> >
>> > I have gone through the code concerning the issue raised. I also read
>> about
>> > the working of git status command and the problem that I am able to
>> figure
>> > out is that although the existing code is able to check whether the
>> current
>> > path exists or not but since it is relying on git status to check
>> whether
>> > the .git file is available or not, a problem is there. The git status
>> checks
>> > the current directory for the .git file but in case the current
>> directory
>> > doesn't have the .git file, it will look for it in the parent directory
>> and
>> > if found there it will return True, which voids the purpose.
>> > So, I think, if a second check is given to validate whether the current
>> > directory contains .git file or not will solve the issue.
>> > So the code may be:
>> > def valid(self):
>> >         if path.exists(self.path):
>> > if path.exists(path.join(self.path, ".git")):
>> >             ec, output = self._run(['status'])
>> >             return ec == 0
>> >         return False
>> > I request you to please guide me whether I proceeded in a right way or
>> not.
>> >
>> That appears to be the code from the patch on the Trac, with Chris'
>> comment to replace os.path.join with path.join. But, have you been
>> able to (1) reproduce the problem, and (2) confirm this fixes it?
>>
>> >
>> > Thanks and Regards
>> > Abhinav Jain
>> >
>> > On Tue, Feb 13, 2018 at 10:50 AM, Abhinav Jain <jainab.2009 at gmail.com>
>> > wrote:
>> >>
>> >> Sir,
>> >>
>> >> Thanks for the guidance. I will study the code available and will try
>> to
>> >> resolve the issue as soon as possible.
>> >>
>> >> Thanks and Regards
>> >> Abhinav Jain
>> >>
>> >> On Tue, Feb 13, 2018 at 4:47 AM, Chris Johns <chrisj at rtems.org> wrote:
>> >>>
>> >>> On 13/02/2018 06:05, Gedare Bloom wrote:
>> >>> > Abhinav,
>> >>> >
>> >>> > Attempt to reproduce the reported problem, try out the patch and see
>> >>> > if it works. I see this was reported for 4.10. See if the problem
>> also
>> >>> > affects 4.11, master, and if the fix works for them too.
>> >>>
>> >>> I suspect it is common to all branches.
>> >>>
>> >>> >
>> >>> > On Mon, Feb 12, 2018 at 11:55 AM, Abhinav Jain <
>> jainab.2009 at gmail.com>
>> >>> > wrote:
>> >>> >> Sir,
>> >>> >>
>> >>> >> I have gone through the projects available in the link provided by
>> you
>> >>> >> and I
>> >>> >> am interested in an issue (RSB can sometimes change the wrong local
>> >>> >> git
>> >>> >> repository (includes a fix).) listed there.
>> >>> >> Link: https://devel.rtems.org/ticket/2522#no1
>> >>> >> I request you to please provide some more information regarding
>> this
>> >>> >> so that
>> >>> >> I can proceed with the coding part.
>> >>> >>
>> >>>
>> >>> As Gedare suggests take a look at the master and 4.11 branches and if
>> >>> present
>> >>> work I suggest you work on the master branch and then we can take
>> git.py
>> >>> and
>> >>> back port to 4.11 and 4.10 by simply coping git.py to those branches.
>> >>>
>> >>> Chris
>> >>
>> >>
>> >
>>
>
>
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