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a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1775215486; bh=n2kIfPcxv9fpCDmESjetmPVIXXSHk10QB/niw+4zBdk=; h=From:To:Cc:Subject:In-Reply-To:References:Date:From; b=MPnN5DluGKOUu49y7lrQ31VECTcn+7zuVK939IQ5sR/OYJUUpHW5cHhN86TpjW4ZO GWAnpWC9hE3EaJmqVEmgKjv3EI7JPlNNtKzt9viRA+HTBDfMkDoih68tiF8CTXXb/d y+M3nDSw/J1tEGuM6JqsqQgdoSNuw1ddWxE6tUE6FZyqtuonPwaE0L8RIUHlnjkB0a g3UBF2uo+2owZ0fVzaZAnY5b2wDOxiwaRcF+79st1pSStTkWc+3CIDSh17AFfji0+/ IKrp5d0S0voXE2VTuh4ICx0KqwvSLDAqAshzULkTs16KdZEm15RW4ltzMWiPQBaEBl Q47Y4/9dxpbTw== From: Pratyush Yadav To: Breno Leitao Cc: Alexander Graf , Mike Rapoport , Pasha Tatashin , Pratyush Yadav , linux-kernel@vger.kernel.org, kexec@lists.infradead.org, linux-mm@kvack.org, usama.arif@linux.dev, SeongJae Park , kernel-team@meta.com Subject: Re: [PATCH v9 3/6] kho: persist blob size in KHO FDT In-Reply-To: <20260316-kho-v9-3-ed6dcd951988@debian.org> (Breno Leitao's message of "Mon, 16 Mar 2026 04:54:33 -0700") References: <20260316-kho-v9-0-ed6dcd951988@debian.org> <20260316-kho-v9-3-ed6dcd951988@debian.org> Date: Fri, 03 Apr 2026 11:24:42 +0000 Message-ID: <2vxztstscmmd.fsf@kernel.org> User-Agent: Gnus/5.13 (Gnus v5.13) MIME-Version: 1.0 Content-Type: text/plain X-Stat-Signature: o1nj3rentkqhxntj5rryxw5skzfdf6ju X-Rspamd-Queue-Id: BEC7D20009 X-Rspam-User: X-Rspamd-Server: rspam03 X-HE-Tag: 1775215487-483079 X-HE-Meta: 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Mon, Mar 16 2026, Breno Leitao wrote: > kho_add_subtree() accepts a size parameter but only forwards it to > debugfs. The size is not persisted in the KHO FDT, so it is lost across > kexec. This makes it impossible for the incoming kernel to determine the > blob size without understanding the blob format. > > Store the blob size as a "blob-size" property in the KHO FDT alongside > the "preserved-data" physical address. This allows the receiving kernel > to recover the size for any blob regardless of format. > > Also extend kho_retrieve_subtree() with an optional size output > parameter so callers can learn the blob size without needing to > understand the blob format. Update all callers to pass NULL for the > new parameter. > > Reviewed-by: Mike Rapoport (Microsoft) > Signed-off-by: Breno Leitao Reviewed-by: Pratyush Yadav [...] -- Regards, Pratyush Yadav