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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Stat-Signature: nut3npcuucx1we48erscm4es8bz96ssj X-Rspam-User: X-Rspamd-Queue-Id: 4995B10000B X-Rspamd-Server: rspam01 X-HE-Tag: 1756193819-833958 X-HE-Meta: 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 8azPIcsA H7HwwjGaK3DFVC/KI9tLtB4XXMw/nDFTJu81fOS2aQRMB+681IXGpa5Erp9Ka+hJQxXgZJnRBQWf8lPPQLiaf0LirRIKMANm+YaGUvPUwryZAGPc7sfIveV1xKMwP4eSONphlPrsuhos+ZZy9jffr//MJoPLKY5CJpngGrJ1pzTZZJFlg3BjrAI9Zc1FyrvAfwHgNsIp89NPvsi4GN3KBrbiNZpdpyAvUzm07Jqs0uOgTaNMJ2fQfz55fXm5zVEP0t/sOH5MuN7D4t3+1hn69z5ON0vwmwdtqRhkmtjaXaNqsUxsXd8tinhPJ2f+c0kWhetkU+RuG8Qd/5AAi7FtEncRvTUSxcCIZMu+IkqLqWYpIJCKidvJlAfX/649TNF3ZrMD00rNA70I9Nv6bTs5VXi4FLjCoP8HhLgYBJng9qX/rICBcFzSsmPoXlrm8OuiZAxDr7oonD4Ez9nxT/kKy+wAZUeKDzF61kD1KFNMBEE3j5LQ= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 26.08.25 09:19, Mike Rapoport wrote: > From: "Mike Rapoport (Microsoft)" > > The kernel-doc description of MEMBLOCK_RSRV_NOINIT and > memblock_reserved_mark_noinit() do not accurately describe their > functionality. > > Expand their kernel doc to make it clear that the user of > MEMBLOCK_RSRV_NOINIT is responsible to properly initialize the struct pages > for such regions and add more details about effects of using this flag. > > Signed-off-by: Mike Rapoport (Microsoft) > --- > include/linux/memblock.h | 5 +++-- > mm/memblock.c | 15 +++++++++++---- > 2 files changed, 14 insertions(+), 6 deletions(-) > > diff --git a/include/linux/memblock.h b/include/linux/memblock.h > index b96746376e17..fcda8481de9a 100644 > --- a/include/linux/memblock.h > +++ b/include/linux/memblock.h > @@ -40,8 +40,9 @@ extern unsigned long long max_possible_pfn; > * via a driver, and never indicated in the firmware-provided memory map as > * system RAM. This corresponds to IORESOURCE_SYSRAM_DRIVER_MANAGED in the > * kernel resource tree. > - * @MEMBLOCK_RSRV_NOINIT: memory region for which struct pages are > - * not initialized (only for reserved regions). > + * @MEMBLOCK_RSRV_NOINIT: reserved memory region for which struct pages are not > + * fully initialized. Users of this flag are responsible to properly initialize > + * struct pages of this region > * @MEMBLOCK_RSRV_KERN: memory region that is reserved for kernel use, > * either explictitly with memblock_reserve_kern() or via memblock > * allocation APIs. All memblock allocations set this flag. > diff --git a/mm/memblock.c b/mm/memblock.c > index 154f1d73b61f..46b411fb3630 100644 > --- a/mm/memblock.c > +++ b/mm/memblock.c > @@ -1091,13 +1091,20 @@ int __init_memblock memblock_clear_nomap(phys_addr_t base, phys_addr_t size) > > /** > * memblock_reserved_mark_noinit - Mark a reserved memory region with flag > - * MEMBLOCK_RSRV_NOINIT which results in the struct pages not being initialized > - * for this region. > + * MEMBLOCK_RSRV_NOINIT > + * > * @base: the base phys addr of the region > * @size: the size of the region > * > - * struct pages will not be initialized for reserved memory regions marked with > - * %MEMBLOCK_RSRV_NOINIT. > + * The struct pages for the reserved regions marked %MEMBLOCK_RSRV_NOINIT will > + * not be fully initialized to allow the caller optimize their initialization. > + * > + * When %CONFIG_DEFERRED_STRUCT_PAGE_INIT is enabled, setting this flag > + * completely bypasses the initialization of struct pages for such region. > + * > + * When %CONFIG_DEFERRED_STRUCT_PAGE_INIT is disabled, struct pages in this > + * region will be initialized with default values but won't be marked as > + * reserved. > * > * Return: 0 on success, -errno on failure. > */ Reviewed-by: David Hildenbrand -- Cheers David / dhildenb