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a=rsa-sha256; c=relaxed/relaxed; d=suse.cz; s=susede2_rsa; t=1742996897; 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=CpgOCEZuVIUWNep2gTFj8ylP6/HyHac52qszIRih0MA=; b=ncox97gATOX1alCd8mq6tMQ+oN4cqL7jSUyXj457qSKzkZ0wwVDb6s22LmHLmdDrIbEv7m tj3S82ZSwDi6rr+7+VSppcricoX2dq5P1xkjwCeILRV/CCugFh0R8HvF244ewHqntUeqIi qL4FhvAbn/7+FK07EUFQosNn6jztpWs= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.cz; s=susede2_ed25519; t=1742996897; 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=CpgOCEZuVIUWNep2gTFj8ylP6/HyHac52qszIRih0MA=; b=K/zATkkHnM9kjBG8iYRQBG1YwQdnPko+sQoF0gFiV6R2inYPMAgxuA+dkiqlZ7RKLx7Nqa i9I2r+OSAeN/C6Dg== Date: Wed, 26 Mar 2025 14:48:17 +0100 (CET) From: Miroslav Benes To: Song Liu cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-toolchains@vger.kernel.org, live-patching@vger.kernel.org, indu.bhagat@oracle.com, puranjay@kernel.org, wnliu@google.com, irogers@google.com, joe.lawrence@redhat.com, jpoimboe@kernel.org, mark.rutland@arm.com, peterz@infradead.org, roman.gushchin@linux.dev, rostedt@goodmis.org, will@kernel.org, kernel-team@meta.com Subject: Re: [PATCH v3 1/2] arm64: Implement arch_stack_walk_reliable In-Reply-To: <20250320171559.3423224-2-song@kernel.org> Message-ID: References: <20250320171559.3423224-1-song@kernel.org> <20250320171559.3423224-2-song@kernel.org> User-Agent: Alpine 2.21 (LSU 202 2017-01-01) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII X-Spam-Level: X-Spamd-Result: default: False [-4.30 / 50.00]; BAYES_HAM(-3.00)[99.99%]; NEURAL_HAM_LONG(-1.00)[-1.000]; NEURAL_HAM_SHORT(-0.20)[-0.999]; MIME_GOOD(-0.10)[text/plain]; ARC_NA(0.00)[]; MIME_TRACE(0.00)[0:+]; RCPT_COUNT_TWELVE(0.00)[17]; RCVD_COUNT_ZERO(0.00)[0]; MID_RHS_MATCH_FROMTLD(0.00)[]; FROM_HAS_DN(0.00)[]; DKIM_SIGNED(0.00)[suse.cz:s=susede2_rsa,suse.cz:s=susede2_ed25519]; FROM_EQ_ENVFROM(0.00)[]; TO_DN_SOME(0.00)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; FUZZY_BLOCKED(0.00)[rspamd.com]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.cz:email] X-Spam-Score: -4.30 X-Spam-Flag: NO On Thu, 20 Mar 2025, Song Liu wrote: > With proper exception boundary detection, it is possible to implment > arch_stack_walk_reliable without sframe. > > Note that, arch_stack_walk_reliable does not guarantee getting reliable > stack in all scenarios. Instead, it can reliably detect when the stack > trace is not reliable, which is enough to provide reliable livepatching. > > Signed-off-by: Song Liu Looks good to me. Reviewed-by: Miroslav Benes M