linux-kernel - Re: [PATCH v5 06/10] Uprobes: Support SDT markers having reference count (semaphore)

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Message-ID: <20180703192634.GA32223@redhat.com>
Date:   Tue, 3 Jul 2018 21:26:35 +0200
From:   Oleg Nesterov <oleg@...hat.com>
To:     Ravi Bangoria <ravi.bangoria@...ux.ibm.com>
Cc:     Srikar Dronamraju <srikar@...ux.vnet.ibm.com>, rostedt@...dmis.org,
        mhiramat@...nel.org, peterz@...radead.org, mingo@...hat.com,
        acme@...nel.org, alexander.shishkin@...ux.intel.com,
        jolsa@...hat.com, namhyung@...nel.org,
        linux-kernel@...r.kernel.org, corbet@....net,
        linux-doc@...r.kernel.org, ananth@...ux.vnet.ibm.com,
        alexis.berlemont@...il.com, naveen.n.rao@...ux.vnet.ibm.com,
        linux-arm-kernel@...ts.infradead.org, linux-mips@...ux-mips.org,
        linux@...linux.org.uk, ralf@...ux-mips.org, paul.burton@...s.com
Subject: Re: [PATCH v5 06/10] Uprobes: Support SDT markers having reference
 count (semaphore)

On 07/03, Ravi Bangoria wrote:
>
> Now about adding ref_ctr_offset into uprobe_consumer. Actually, I
> didn't want to change the uprobe_consumer definition because it's
> already exported and tools like systemtap are using it.

So what? Yes, the out-of-tree modules should be updated, but this doesn't
mean we can add the new features.

And, speaking of systemtap, it already has to do build-time checks to verify
that uprobe_consumer->ret_handler member exists. So it will need another
STAPCONF_INODE_REFCNT and that is all.

Oleg.