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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: 1F5F714000A X-Stat-Signature: bgrerf1mo9ip57p3yyhf19rzd6gr7gw4 X-Rspam-User: X-HE-Tag: 1756139035-424060 X-HE-Meta: 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 EO9Il7o/ aJOkHKa3gH2fH+jM3dwmCO5LLIltg1OcyP2OsRI3tY92Tsl8YoxP24pF8rK4z2Wmywq0N/UYqgVVHG40qhMbRXnjTtQ== 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: > >> We should do something like: >> >> diff --git a/mm/memblock.c b/mm/memblock.c >> index 154f1d73b61f2..ed4c563d72c32 100644 >> --- a/mm/memblock.c >> +++ b/mm/memblock.c >> @@ -1091,13 +1091,16 @@ 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 which allows for the "struct pages" corresponding >> + * to this region not getting initialized, because the caller will take >> + * care of it. >> * @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. >> + * "struct pages" will not be initialized for reserved memory regions marked >> + * with %MEMBLOCK_RSRV_NOINIT if this function is called before initialization >> + * code runs. Without CONFIG_DEFERRED_STRUCT_PAGE_INIT, it is more likely >> + * that this function is not effective. >> * >> * Return: 0 on success, -errno on failure. >> */ > > I have a different version :) > > diff --git a/include/linux/memblock.h b/include/linux/memblock.h > index b96746376e17..d20d091c6343 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: memory region for which struct pages don't have > + * PG_Reserved set and are completely not initialized when > + * %CONFIG_DEFERRED_STRUCT_PAGE_INIT is enabled (only for reserved regions). > * @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..02de5ffb085b 100644 > --- a/mm/memblock.c > +++ b/mm/memblock.c > @@ -1091,13 +1091,15 @@ 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 have %PG_Reserved flag set. > + * When %CONFIG_DEFERRED_STRUCT_PAGE_INIT is enabled, setting this flags also > + * completly bypasses the initialization of struct pages for this region. s/completly/completely. I don't quite understand the interaction with PG_Reserved and why anybody using this function should care. So maybe you can rephrase in a way that is easier to digest, and rather focuses on what callers of this function are supposed to do vs. have the liberty of not doing? -- Cheers David / dhildenb