From: Nicholas Piggin <npiggin@gmail.com>
To: "Naveen N. Rao" <naveen.n.rao@linux.vnet.ibm.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>,
Ananth N Mavinakayanahalli <ananth@linux.vnet.ibm.com>,
Masami Hiramatsu <mhiramat@kernel.org>,
linuxppc-dev@lists.ozlabs.org
Subject: Re: [PATCH v3 3/6] powerpc/64s: Blacklist system_call() and system_call_common() from kprobes
Date: Thu, 22 Jun 2017 13:36:40 +1000 [thread overview]
Message-ID: <20170622133640.66861cda@roar.ozlabs.ibm.com> (raw)
In-Reply-To: <e602b626323ee22ac39de305b62385a2a0210018.1498069502.git.naveen.n.rao@linux.vnet.ibm.com>
On Thu, 22 Jun 2017 00:08:39 +0530
"Naveen N. Rao" <naveen.n.rao@linux.vnet.ibm.com> wrote:
> Convert some of the symbols into private symbols and blacklist
> system_call_common() and system_call() from kprobes. We can't take a
> trap at parts of these functions as either MSR_RI is unset or the kernel
> stack pointer is not yet setup.
>
> Reviewed-by: Masami Hiramatsu <mhiramat@kernel.org>
> Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
I don't have a problem with this bunch of system call labels
going private. They've never added much for me in profiles.
Reviewed-by: Nicholas Piggin <npiggin@gmail.com>
Semi-related question, why is system_call: where it is? Should we
move it up to right after the mtmsrd / wrteei instruction?
(obviously for another patch). It's pretty common to get PMU
interrupts coming in right after mtmsr and this makes profiles split
the syscall into two which is annoying.
Thanks,
Nick
next prev parent reply other threads:[~2017-06-22 3:36 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-06-21 18:38 [PATCH v3 0/6] powerpc: build out kprobes blacklist -- series 3 Naveen N. Rao
2017-06-21 18:38 ` [PATCH v3 1/6] powerpc64/elfv1: Validate function pointer address in the function descriptor Naveen N. Rao
2017-06-22 3:22 ` Nicholas Piggin
2017-06-22 10:59 ` Michael Ellerman
2017-06-22 13:06 ` Nicholas Piggin
2017-06-22 14:01 ` Naveen N. Rao
2017-06-21 18:38 ` [PATCH v3 2/6] powerpc/64s: Convert .L__replay_interrupt_return to a local label Naveen N. Rao
2017-06-22 3:23 ` Nicholas Piggin
2017-06-21 18:38 ` [PATCH v3 3/6] powerpc/64s: Blacklist system_call() and system_call_common() from kprobes Naveen N. Rao
2017-06-22 3:36 ` Nicholas Piggin [this message]
2017-06-22 11:07 ` Michael Ellerman
2017-06-22 13:08 ` Nicholas Piggin
2017-06-22 14:34 ` Naveen N. Rao
2017-06-21 18:38 ` [PATCH v3 4/6] powerpc/64s: Un-blacklist system_call() " Naveen N. Rao
2017-06-22 3:41 ` Nicholas Piggin
2017-06-22 11:14 ` Michael Ellerman
2017-06-22 13:14 ` Nicholas Piggin
2017-06-22 15:43 ` Naveen N. Rao
2017-06-21 18:38 ` [PATCH v3 5/6] powerpc/64s: Blacklist functions invoked on a trap Naveen N. Rao
2017-06-22 3:44 ` Nicholas Piggin
2017-06-22 11:12 ` Michael Ellerman
2017-06-21 18:38 ` [PATCH v3 6/6] powerpc/64s: Blacklist rtas entry/exit from kprobes Naveen N. Rao
2017-06-22 3:48 ` Nicholas Piggin
2017-06-22 16:52 ` Naveen N. Rao
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