linux-kernel - Re: [PATCH 6/7] uprobes: Allow the use of uprobe

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Message-ID: <20250319145057.GA10753@redhat.com>
Date: Wed, 19 Mar 2025 15:51:13 +0100
From: Oleg Nesterov <oleg@...hat.com>
To: Jeremy Linton <jeremy.linton@....com>
Cc: linux-trace-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
	mhiramat@...nel.org, peterz@...radead.org, acme@...nel.org,
	namhyung@...nel.org, mark.rutland@....com,
	alexander.shishkin@...ux.intel.com, jolsa@...nel.org,
	irogers@...gle.com, adrian.hunter@...el.com,
	kan.liang@...ux.intel.com, thiago.bauermann@...aro.org,
	broonie@...nel.org, yury.khrustalev@....com,
	kristina.martsenko@....com, liaochang1@...wei.com,
	catalin.marinas@....com, will@...nel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 6/7] uprobes: Allow the use of uprobe_warn() in arch code

On 03/18, Jeremy Linton wrote:
>
> --- a/include/linux/uprobes.h
> +++ b/include/linux/uprobes.h
> @@ -185,6 +185,7 @@ struct uprobes_state {
>  };
>  
>  extern void __init uprobes_init(void);
> +extern void uprobe_warn(struct task_struct *t, const char *msg);
>  extern int set_swbp(struct arch_uprobe *aup, struct mm_struct *mm, unsigned long vaddr);
>  extern int set_orig_insn(struct arch_uprobe *aup, struct mm_struct *mm, unsigned long vaddr);
>  extern bool is_swbp_insn(uprobe_opcode_t *insn);
> diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
> index b4ca8898fe17..613c1c76f227 100644
> --- a/kernel/events/uprobes.c
> +++ b/kernel/events/uprobes.c
> @@ -118,7 +118,7 @@ struct xol_area {
>  	unsigned long 			vaddr;		/* Page(s) of instruction slots */
>  };
>  
> -static void uprobe_warn(struct task_struct *t, const char *msg)
> +void uprobe_warn(struct task_struct *t, const char *msg)
>  {
>  	pr_warn("uprobe: %s:%d failed to %s\n", current->comm, current->pid, msg);
>  }

Oh, no, please don't.

uprobe_warn() is ugly and needs changes. If nothing else it doesn't even use
its "t" argument.

Oleg.