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b=CBBUkAdNPfmmIltuHE6pZ6GpwC9m1K+SXX9SsGPrXIW3gJCsavgLlBBFhllhQ8YOV tt4v86XDdlFoZfXDWWeQB/kZRnJsC72/2SzZfO03eHu3zwjOw/NRJZJdfe7tPOsj/H xZPsKYg2lEOyHQVDuzvBc3T+oW5ge/Ms1dc/coAeYjdDtxnlJCj3sgd0nOmr6HhLlb ryVmy9CH86EKbBkS5gNJ82lQSGvFhRoc7XumwqORtvLuF6ft5AuU9wHZOeQVY8tmIJ ikfw0WPIJMlejTpAQz8wOen8RRrBNWQTRHTEyw9/Q1dMm1o4NegwxmZRKfaj1AEbCW zcL0eU61oIoEA== Date: Fri, 27 Mar 2026 20:12:14 +0300 From: Mike Rapoport To: Bert Karwatzki Cc: linux-kernel@vger.kernel.org, Liam.Howlett@oracle.com, akpm@linux-foundation.org, andreas@gaisler.com, ardb@kernel.org, bp@alien8.de, brauner@kernel.org, catalin.marinas@arm.com, chleroy@kernel.org, dave.hansen@linux.intel.com, davem@davemloft.net, david@kernel.org, devicetree@vger.kernel.org, dvyukov@google.com, elver@google.com, glider@google.com, hannes@cmpxchg.org, hpa@zytor.com, ilias.apalodimas@linaro.org, iommu@lists.linux.dev, jack@suse.cz, jackmanb@google.com, kasan-dev@googlegroups.com, linux-arm-kernel@lists.infradead.org, linux-efi@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-trace-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, lorenzo.stoakes@oracle.com, m.szyprowski@samsung.com, maddy@linux.ibm.com, mhiramat@kernel.org, mhocko@suse.com, mingo@redhat.com, mpe@ellerman.id.au, npiggin@gmail.com, robh@kernel.org, robin.murphy@arm.com, saravanak@kernel.org, sparclinux@vger.kernel.org, surenb@google.com, tglx@kernel.org, vbabka@kernel.org, viro@zeniv.linux.org.uk, will@kernel.org, x86@kernel.org, ziy@nvidia.com Subject: Re: Warning from free_reserved_area() in next-20260325+ Message-ID: References: <20260323074836.3653702-10-rppt@kernel.org> <20260327140109.7561-1-spasswolf@web.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260327140109.7561-1-spasswolf@web.de> X-Rspamd-Queue-Id: 8512180018 X-Stat-Signature: onznn1rgqz5hoyjj6hjyrioqarj7nawc X-Rspam-User: X-Rspamd-Server: rspam08 X-HE-Tag: 1774631552-647370 X-HE-Meta: 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 eRmrzUAy OVlQM Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Hi Bert, On Fri, Mar 27, 2026 at 03:01:08PM +0100, Bert Karwatzki wrote: > Starting with linux next-20260325 I see the following warning early in the > boot process of a machine running debian stable (trixie) (except for the kernel): Thanks for the report! > [ 0.027118] [ T0] ------------[ cut here ]------------ > [ 0.027118] [ T0] Cannot free reserved memory because of deferred initialization of the memory map > [ 0.027119] [ T0] WARNING: mm/memblock.c:904 at __free_reserved_area+0xa9/0xc0, CPU#0: swapper/0/0 > [ 0.027122] [ T0] Modules linked in: > [ 0.027123] [ T0] CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted 7.0.0-rc5-next-20260326-master #385 PREEMPT_RT > [ 0.027125] [ T0] Hardware name: ASUS System Product Name/ROG STRIX B850-F GAMING WIFI, BIOS 1627 02/05/2026 > [ 0.027125] [ T0] RIP: 0010:__free_reserved_area+0xa9/0xc0 > [ 0.027126] [ T0] Code: 48 89 df 48 89 ee e8 06 fe ff ff 48 89 c3 48 39 e8 72 a0 5b 4c 89 e8 5d 41 5c 41 5d 41 5e c3 cc cc cc cc 48 8d 3d 97 c2 c6 00 <67> 48 0f b9 3a 45 31 ed eb df 66 66 2e 0f 1f 84 00 00 00 00 00 66 > [ 0.027127] [ T0] RSP: 0000:ffffffff9b203e98 EFLAGS: 00010202 > [ 0.027128] [ T0] RAX: 0000000e91c00001 RBX: ffffffff9b100c0f RCX: 0000000080000001 > [ 0.027128] [ T0] RDX: 00000000000000cc RSI: 0000000e2d42d000 RDI: ffffffff9b32ef60 > [ 0.027128] [ T0] RBP: ffff9eeafdd6fbc0 R08: 0000000000000000 R09: 0000000000000001 > [ 0.027129] [ T0] R10: 0000000000001000 R11: 8000000000000163 R12: 000000000000006f > [ 0.027129] [ T0] R13: 0000000000000000 R14: 0000000000000045 R15: 000000005c8a1000 > [ 0.027129] [ T0] FS: 0000000000000000(0000) GS:ffff9eeb21c05000(0000) knlGS:0000000000000000 > [ 0.027130] [ T0] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > [ 0.027130] [ T0] CR2: ffff9ee8ad801000 CR3: 0000000e2ce1e000 CR4: 0000000000f50ef0 > [ 0.027131] [ T0] PKRU: 55555554 > [ 0.027131] [ T0] Call Trace: > [ 0.027132] [ T0] > [ 0.027132] [ T0] free_reserved_area+0x89/0xd0 > [ 0.027133] [ T0] alternative_instructions+0xee/0x110 > [ 0.027136] [ T0] arch_cpu_finalize_init+0x10f/0x160 > [ 0.027138] [ T0] start_kernel+0x686/0x710 > [ 0.027140] [ T0] x86_64_start_reservations+0x24/0x30 > [ 0.027141] [ T0] x86_64_start_kernel+0xd4/0xe0 > [ 0.027142] [ T0] common_startup_64+0x13e/0x141 > [ 0.027143] [ T0] > [ 0.027144] [ T0] ---[ end trace 0000000000000000 ]--- Does this patch fix it for you? diff --git a/arch/x86/kernel/alternative.c b/arch/x86/kernel/alternative.c index e87da25d1236..62936a3bde19 100644 --- a/arch/x86/kernel/alternative.c +++ b/arch/x86/kernel/alternative.c @@ -2448,19 +2448,31 @@ void __init alternative_instructions(void) __smp_locks, __smp_locks_end, _text, _etext); } +#endif + restart_nmi(); + alternatives_patched = 1; + + alt_reloc_selftest(); +} + +#ifdef CONFIG_SMP +/* + * With CONFIG_DEFERRED_STRUCT_PAGE_INIT enabled we can free_init_pages() only + * after the deferred initialization of the memory map is complete. + */ +static int __init free_smp_locks(void) +{ if (!uniproc_patched || num_possible_cpus() == 1) { free_init_pages("SMP alternatives", (unsigned long)__smp_locks, (unsigned long)__smp_locks_end); } -#endif - restart_nmi(); - alternatives_patched = 1; - - alt_reloc_selftest(); + return 0; } +arch_initcall(free_smp_locks); +#endif /** * text_poke_early - Update instructions on a live kernel at boot time > Bert Karwatzki -- Sincerely yours, Mike.