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a=rsa-sha256; c=relaxed/relaxed; d=suse.cz; s=susede2_rsa; t=1775729313; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=/4YHUZBuBWUA7o0h5dWVSLlyfPkU18QmDDLBi+t5/uU=; b=LhBo2qrXJqcmczNFHHWVdGcsLQsVIL1yREAVlsVVK0OjK80a1uZffAT+f5r+nLAGij6iNQ bZNLoskMZTXkpKlsBVWFo09oiK0oBHgGgLynsmW8/c2r8RxYV7aE+0ogdhlRmHLT6OP67x BKSkw9RHeeIM7qmC3attuKB0ztgRhHE= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.cz; s=susede2_ed25519; t=1775729313; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=/4YHUZBuBWUA7o0h5dWVSLlyfPkU18QmDDLBi+t5/uU=; b=QJIDTV/XnUqaZWaQIHo/n4/fcGYqQPkaFAEdqeFfHYj85pC3LyfGdeQKmWuLPjbcNHB2uN x4oRvJbBw7LeIWCA== Date: Thu, 9 Apr 2026 12:08:33 +0200 (CEST) From: Miroslav Benes To: Yafang Shao cc: Song Liu , jpoimboe@kernel.org, jikos@kernel.org, pmladek@suse.com, joe.lawrence@redhat.com, rostedt@goodmis.org, mhiramat@kernel.org, mathieu.desnoyers@efficios.com, kpsingh@kernel.org, mattbobrowski@google.com, jolsa@kernel.org, ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org, martin.lau@linux.dev, eddyz87@gmail.com, memxor@gmail.com, yonghong.song@linux.dev, live-patching@vger.kernel.org, linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, bpf@vger.kernel.org Subject: Re: [RFC PATCH 0/4] trace, livepatch: Allow kprobe return overriding for livepatched functions In-Reply-To: Message-ID: References: <20260402092607.96430-1-laoar.shao@gmail.com> User-Agent: Alpine 2.21 (LSU 202 2017-01-01) Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII X-Spam-Score: -2.80 X-Spam-Level: X-Spamd-Result: default: False [-2.80 / 50.00]; BAYES_HAM(-3.00)[99.99%]; SUSPICIOUS_RECIPS(1.50)[]; NEURAL_HAM_LONG(-1.00)[-1.000]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; RCVD_COUNT_ZERO(0.00)[0]; TAGGED_RCPT(0.00)[]; ARC_NA(0.00)[]; MIME_TRACE(0.00)[0:+]; FUZZY_RATELIMITED(0.00)[rspamd.com]; FREEMAIL_TO(0.00)[gmail.com]; FREEMAIL_ENVRCPT(0.00)[gmail.com]; RCPT_COUNT_TWELVE(0.00)[23]; FROM_HAS_DN(0.00)[]; FREEMAIL_CC(0.00)[kernel.org,suse.com,redhat.com,goodmis.org,efficios.com,google.com,iogearbox.net,linux.dev,gmail.com,vger.kernel.org]; MID_RHS_MATCH_FROMTLD(0.00)[]; FROM_EQ_ENVFROM(0.00)[]; DKIM_SIGNED(0.00)[suse.cz:s=susede2_rsa,suse.cz:s=susede2_ed25519]; TO_MATCH_ENVRCPT_ALL(0.00)[]; TO_DN_SOME(0.00)[] X-Spam-Flag: NO > Can we add something like ALLOW_LIVEPATCH_ERROR_INJECTION() to allow > error injection on functions defined inside a livepatch? No. I am sorry but you always seem to find band aids to your set up and how you deal with live patches internally. While I can see that something like a hybrid mode might be useful to people if done right (and we are not there yet), the combination of it with bpf overrides or anything like that is not something I would like to see in upstream. Miroslav