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Peter Anvin" , Peter Zijlstra , Pratyush Yadav , Rob Herring , Rob Herring , Saravana Kannan , Stanislav Kinsburskii , Steven Rostedt , Thomas Gleixner , Tom Lendacky , Usama Arif , Will Deacon , devicetree@vger.kernel.org, kexec@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-doc@vger.kernel.org, linux-mm@kvack.org, x86@kernel.org Subject: Re: [PATCH v4 13/14] memblock: Add KHO support for reserve_mem Message-ID: <20250217040448.56xejbvsr2a73h4c@master> References: <20250206132754.2596694-1-rppt@kernel.org> <20250206132754.2596694-14-rppt@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20250206132754.2596694-14-rppt@kernel.org> User-Agent: NeoMutt/20170113 (1.7.2) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250216_200453_255009_223863AD X-CRM114-Status: GOOD ( 18.76 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: Wei Yang Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Thu, Feb 06, 2025 at 03:27:53PM +0200, Mike Rapoport wrote: >From: Alexander Graf > >Linux has recently gained support for "reserve_mem": A mechanism to >allocate a region of memory early enough in boot that we can cross our >fingers and hope it stays at the same location during most boots, so we >can store for example ftrace buffers into it. > >Thanks to KASLR, we can never be really sure that "reserve_mem" >allocations are static across kexec. Let's teach it KHO awareness so >that it serializes its reservations on kexec exit and deserializes them >again on boot, preserving the exact same mapping across kexec. > >This is an example user for KHO in the KHO patch set to ensure we have >at least one (not very controversial) user in the tree before extending >KHO's use to more subsystems. > >Signed-off-by: Alexander Graf >Co-developed-by: Mike Rapoport (Microsoft) >Signed-off-by: Mike Rapoport (Microsoft) >--- > mm/memblock.c | 131 ++++++++++++++++++++++++++++++++++++++++++++++++++ > 1 file changed, 131 insertions(+) > >diff --git a/mm/memblock.c b/mm/memblock.c >index 84df96efca62..fdb08b60efc1 100644 >--- a/mm/memblock.c >+++ b/mm/memblock.c >@@ -16,6 +16,9 @@ > #include > #include > #include >+#include Looks this one breaks the memblock test in tools/testing/memblock. memblock.c:19:10: fatal error: linux/kexec_handover.h: No such file or directory 19 | #include | ^~~~~~~~~~~~~~~~~~~~~~~~ >+#include >+#include > -- Wei Yang Help you, Help me