linux-kernel - Re: [PATCH v4 28/39] unwind_user/deferred: Add deferred unwinding interface

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Message-ID: <30483278-c065-4851-b709-8d1dcfa1fe5e@linux.ibm.com>
Date: Fri, 24 Jan 2025 17:35:37 +0100
From: Jens Remus <jremus@...ux.ibm.com>
To: Josh Poimboeuf <jpoimboe@...nel.org>, x86@...nel.org
Cc: Peter Zijlstra <peterz@...radead.org>,
        Steven Rostedt <rostedt@...dmis.org>, Ingo Molnar <mingo@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        linux-kernel@...r.kernel.org, Indu Bhagat <indu.bhagat@...cle.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>, Namhyung Kim <namhyung@...nel.org>,
        Ian Rogers <irogers@...gle.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        linux-perf-users@...r.kernel.org, Mark Brown <broonie@...nel.org>,
        linux-toolchains@...r.kernel.org, Jordan Rome <jordalgo@...a.com>,
        Sam James <sam@...too.org>, linux-trace-kernel@...r.kernel.org,
        Andrii Nakryiko <andrii.nakryiko@...il.com>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Florian Weimer <fweimer@...hat.com>, Andy Lutomirski <luto@...nel.org>,
        Masami Hiramatsu <mhiramat@...nel.org>, Weinan Liu <wnliu@...gle.com>,
        Heiko Carstens <hca@...ux.ibm.com>, Vasily Gorbik <gor@...ux.ibm.com>
Subject: Re: [PATCH v4 28/39] unwind_user/deferred: Add deferred unwinding
 interface

On 22.01.2025 03:31, Josh Poimboeuf wrote:

> diff --git a/include/linux/unwind_deferred.h b/include/linux/unwind_deferred.h

> +#ifdef CONFIG_UNWIND_USER
> +
> +void unwind_task_init(struct task_struct *task);
> +void unwind_task_free(struct task_struct *task);
> +
> +void unwind_deferred_init(struct unwind_work *work, unwind_callback_t func);
> +int unwind_deferred_request(struct unwind_work *work, u64 *cookie);
> +bool unwind_deferred_cancel(struct task_struct *task, struct unwind_work *work);
> +
> +static __always_inline void unwind_enter_from_user_mode(void)
> +{
> +	current->unwind_info.cookie = 0;
> +}
> +
> +#else /* !CONFIG_UNWIND_USER */
> +
> +static inline void unwind_task_init(struct task_struct *task) {}
> +static inline void unwind_task_free(struct task_struct *task) {}
> +
> +static inline void unwind_deferred_init(struct unwind_work *work, unwind_callback_t func) {}
> +static inline int unwind_deferred_request(struct task_struct *task, struct unwind_work *work, u64 *cookie) { return -ENOSYS; }

static inline int unwind_deferred_request(struct unwind_work *work, u64 *cookie) { return -ENOSYS; }

Otherwise this does not compile on architectures that do not enable
UNWIND_USER.

> +static inline bool unwind_deferred_cancel(struct task_struct *task, struct unwind_work *work) { return false; }
> +
> +static inline void unwind_enter_from_user_mode(void) {}
> +
> +#endif /* !CONFIG_UNWIND_USER */

Regards,
Jens
-- 
Jens Remus
Linux on Z Development (D3303)
+49-7031-16-1128 Office
jremus@...ibm.com

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