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client.hidden.invalid by smtp.web.de (mrweb006 [213.165.67.108]) with ESMTPSA (Nemesis) id 1Mvsln-1vDqKE2JAV-0134vi; Fri, 27 Mar 2026 20:54:33 +0100 Message-ID: <59508c77abe7605636cde616c8c3b3291c6acf54.camel@web.de> Subject: Re: Warning from free_reserved_area() in next-20260325+ From: Bert Karwatzki To: Mike Rapoport Cc: linux-kernel@vger.kernel.org, spasswolf@web.de, 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, 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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 t= he kernel): >=20 > Thanks for the report! >=20 > > [ 0.027118] [ T0] ------------[ cut here ]------------ > > [ 0.027118] [ T0] Cannot free reserved memory because of defer= red initialization of the memory map > > [ 0.027119] [ T0] WARNING: mm/memblock.c:904 at __free_reserve= d_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 tai= nted 7.0.0-rc5-next-20260326-master #385 PREEMPT_RT=20 > > [ 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 3= d 97 c2 c6 00 <67> 48 0f b9 3a 45 31 ed eb df 66 66 2e 0f 1f 84 00 00 00 0= 0 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:ffff9eeb21c05= 000(0000) knlGS:0000000000000000 > > [ 0.027130] [ T0] CS: 0010 DS: 0000 ES: 0000 CR0: 00000000800= 50033 > > [ 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 ]--- >=20 > Does this patch fix it for you? >=20 > 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 > =20 > + restart_nmi(); > + alternatives_patched =3D 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() =3D=3D 1) { > free_init_pages("SMP alternatives", > (unsigned long)__smp_locks, > (unsigned long)__smp_locks_end); > } > -#endif > =20 > - restart_nmi(); > - alternatives_patched =3D 1; > - > - alt_reloc_selftest(); > + return 0; > } > +arch_initcall(free_smp_locks); > +#endif > =20 > /** > * text_poke_early - Update instructions on a live kernel at boot time > =20 > > Bert Karwatzki Yes, your patch fixes the issue in next-20260326. Tested-By: Bert Karwatzki Bert Karwatzki