From: Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>
To: Michael Ellerman <mpe@ellerman.id.au>
Cc: Maninder Singh <maninder1.s@samsung.com>,
bcain@quicinc.com, npiggin@gmail.com,
christophe.leroy@csgroup.eu, keescook@chromium.org,
nathanl@linux.ibm.com, ustavoars@kernel.org,
alex.gaynor@gmail.com, gary@garyguo.net, ojeda@kernel.org,
pmladek@suse.com, wedsonaf@google.com,
linux-hexagon@vger.kernel.org, linux-kernel@vger.kernel.org,
linuxppc-dev@lists.ozlabs.org,
Onkarnath <onkarnath.1@samsung.com>
Subject: Re: [PATCH 2/2] powerpc/xmon: use KSYM_NAME_LEN in array size
Date: Thu, 1 Jun 2023 12:27:30 +0200 [thread overview]
Message-ID: <CANiq72nf-MC36hHzv0ZpR+qUyaf3mhF+rfqpMcVbw0AheuRBpA@mail.gmail.com> (raw)
In-Reply-To: <87ilc8ym6v.fsf@mail.lhotse>
On Thu, Jun 1, 2023 at 4:02 AM Michael Ellerman <mpe@ellerman.id.au> wrote:
>
> > Side-note: in `get_function_bounds()`, I see `kallsyms_lookup()` being
> > used, but the name seems discarded? Can
> > `kallsyms_lookup_size_offset()` be used instead, thus avoiding the
> > usage of the buffer there to begin with?
>
> A few lines below it uses the modname, and AFAICS there's no (easy) way
> to lookup the modname without also looking up the name.
Hmm... I think you are looking at the `xmon_print_symbol()` one? I was
referring to the `get_function_bounds()` one, where the `modname`
parameter is `NULL` (and the `name` contents are not used, only
whether it was found or not).
> > Side-note 2: in `scanhex()`, I see a loop `i<63` using `tmpstr` which
> > then is used to do a `kallsyms_lookup_name()`, so I guess symbols
> > larger than 64 couldn't be found. I have no idea about what are the
> > external constraints here, but perhaps it is possible to increase the
> > `line` buffer etc. to then allow for bigger symbols to be found.
>
> Yeah that looks wrong. I don't see any symbols that long in current
> kernels, but we should fix it.
>
> Thanks for looking.
My pleasure!
Cheers,
Miguel
WARNING: multiple messages have this Message-ID (diff)
From: Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>
To: Michael Ellerman <mpe@ellerman.id.au>
Cc: nathanl@linux.ibm.com, bcain@quicinc.com, keescook@chromium.org,
gary@garyguo.net, pmladek@suse.com,
linux-hexagon@vger.kernel.org, ustavoars@kernel.org,
linux-kernel@vger.kernel.org, ojeda@kernel.org,
wedsonaf@google.com, npiggin@gmail.com, alex.gaynor@gmail.com,
Maninder Singh <maninder1.s@samsung.com>,
Onkarnath <onkarnath.1@samsung.com>,
linuxppc-dev@lists.ozlabs.org
Subject: Re: [PATCH 2/2] powerpc/xmon: use KSYM_NAME_LEN in array size
Date: Thu, 1 Jun 2023 12:27:30 +0200 [thread overview]
Message-ID: <CANiq72nf-MC36hHzv0ZpR+qUyaf3mhF+rfqpMcVbw0AheuRBpA@mail.gmail.com> (raw)
In-Reply-To: <87ilc8ym6v.fsf@mail.lhotse>
On Thu, Jun 1, 2023 at 4:02 AM Michael Ellerman <mpe@ellerman.id.au> wrote:
>
> > Side-note: in `get_function_bounds()`, I see `kallsyms_lookup()` being
> > used, but the name seems discarded? Can
> > `kallsyms_lookup_size_offset()` be used instead, thus avoiding the
> > usage of the buffer there to begin with?
>
> A few lines below it uses the modname, and AFAICS there's no (easy) way
> to lookup the modname without also looking up the name.
Hmm... I think you are looking at the `xmon_print_symbol()` one? I was
referring to the `get_function_bounds()` one, where the `modname`
parameter is `NULL` (and the `name` contents are not used, only
whether it was found or not).
> > Side-note 2: in `scanhex()`, I see a loop `i<63` using `tmpstr` which
> > then is used to do a `kallsyms_lookup_name()`, so I guess symbols
> > larger than 64 couldn't be found. I have no idea about what are the
> > external constraints here, but perhaps it is possible to increase the
> > `line` buffer etc. to then allow for bigger symbols to be found.
>
> Yeah that looks wrong. I don't see any symbols that long in current
> kernels, but we should fix it.
>
> Thanks for looking.
My pleasure!
Cheers,
Miguel
WARNING: multiple messages have this Message-ID (diff)
From: Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>
To: Michael Ellerman <mpe@ellerman.id.au>
Cc: nathanl@linux.ibm.com, bcain@quicinc.com, keescook@chromium.org,
gary@garyguo.net, pmladek@suse.com,
linux-hexagon@vger.kernel.org, ustavoars@kernel.org,
linux-kernel@vger.kernel.org, ojeda@kernel.org,
wedsonaf@google.com, npiggin@gmail.com, alex.gaynor@gmail.com,
Maninder Singh <maninder1.s@samsung.com>,
Onkarnath <onkarnath.1@samsung.com>,
linuxppc-dev@lists.ozlabs.org
Subject: Re: [PATCH 2/2] powerpc/xmon: use KSYM_NAME_LEN in array size
Date: Thu, 1 Jun 2023 12:27:30 +0200 [thread overview]
Message-ID: <CANiq72nf-MC36hHzv0ZpR+qUyaf3mhF+rfqpMcVbw0AheuRBpA@mail.gmail.com> (raw)
In-Reply-To: <87ilc8ym6v.fsf@mail.lhotse>
On Thu, Jun 1, 2023 at 4:02 AM Michael Ellerman <mpe@ellerman.id.au> wrote:
>
> > Side-note: in `get_function_bounds()`, I see `kallsyms_lookup()` being
> > used, but the name seems discarded? Can
> > `kallsyms_lookup_size_offset()` be used instead, thus avoiding the
> > usage of the buffer there to begin with?
>
> A few lines below it uses the modname, and AFAICS there's no (easy) way
> to lookup the modname without also looking up the name.
Hmm... I think you are looking at the `xmon_print_symbol()` one? I was
referring to the `get_function_bounds()` one, where the `modname`
parameter is `NULL` (and the `name` contents are not used, only
whether it was found or not).
> > Side-note 2: in `scanhex()`, I see a loop `i<63` using `tmpstr` which
> > then is used to do a `kallsyms_lookup_name()`, so I guess symbols
> > larger than 64 couldn't be found. I have no idea about what are the
> > external constraints here, but perhaps it is possible to increase the
> > `line` buffer etc. to then allow for bigger symbols to be found.
>
> Yeah that looks wrong. I don't see any symbols that long in current
> kernels, but we should fix it.
>
> Thanks for looking.
My pleasure!
Cheers,
Miguel
next prev parent reply other threads:[~2023-06-01 10:28 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CGME20230529111350epcas5p46a1fa16ffb2a39008c26d03c5c63f109@epcas5p4.samsung.com>
2023-05-29 11:13 ` [PATCH 1/2] hexagon/traps.c: use KSYM_NAME_LEN in array size Maninder Singh
2023-05-29 11:13 ` Maninder Singh
[not found] ` <CGME20230529111404epcas5p2d540d726dcf3e21aae2a6a0958e2eea5@epcas5p2.samsung.com>
2023-05-29 11:13 ` [PATCH 2/2] powerpc/xmon: " Maninder Singh
2023-05-29 11:13 ` Maninder Singh
2023-05-30 6:45 ` Michael Ellerman
2023-05-30 6:45 ` Michael Ellerman
2023-05-30 12:54 ` Miguel Ojeda
2023-05-30 12:54 ` Miguel Ojeda
2023-05-30 12:54 ` Miguel Ojeda
2023-06-01 2:02 ` Michael Ellerman
2023-06-01 2:02 ` Michael Ellerman
2023-06-01 2:02 ` Michael Ellerman
2023-06-01 10:27 ` Miguel Ojeda [this message]
2023-06-01 10:27 ` Miguel Ojeda
2023-06-01 10:27 ` Miguel Ojeda
2023-06-01 12:54 ` Michael Ellerman
2023-06-01 12:54 ` Michael Ellerman
2023-06-01 12:54 ` Michael Ellerman
2023-08-03 5:46 ` Benjamin Gray
2023-08-03 5:46 ` Benjamin Gray
2023-05-30 8:59 ` [PATCH 1/2] hexagon/traps.c: " Petr Mladek
2023-05-30 8:59 ` Petr Mladek
2023-05-30 12:59 ` Miguel Ojeda
2023-05-30 12:59 ` Miguel Ojeda
2023-05-30 12:59 ` Miguel Ojeda
2023-05-30 13:42 ` David Laight
2023-05-30 13:42 ` David Laight
2023-07-03 4:02 ` Michael Ellerman
2023-07-03 4:02 ` Michael Ellerman
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