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Qq98MGYCklSQp+IljLthvOFGwX+WXeP1Y1AOCYDnu/kxEcyEk2Fhb/IOWI1TFb8tEO86Ar9zAMp99rw5bDmesjTb7SL0MLxOxocGEyiGInErzQoRajZQnHPhOaUBzCOkjN9lDFnWOPS9O3rBpo8kxFf7acH0Z2nRDcGuaHh87MgwWCKidvSPxZxw909CCA9U5uEyuQJADJTVbU5SE9+neMH3G5SqHXT3ujcW/TR4eGUDDrnaLEMUZre9cDRdTXninhXQ9Iekh7imIvMQcNFCNBdpTzUW5yTXaZLMmd780qw+YKBGsvxZNRxXa8Pkjl6OS1AoSRUvXfy5pfVdUbf6Uk5D5i0Rfb/VAhn/23LiVCF0zEwBF43V0f/SL3CLlBhLvTvnk 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: On 8/22/23 04:20, Matthew Wilcox (Oracle) wrote: > Eliminate a use of page->mapping by using vmalloc_to_folio() instead. > > Signed-off-by: Matthew Wilcox (Oracle) > --- > include/linux/mm.h | 5 +++++ > kernel/events/ring_buffer.c | 4 ++-- > 2 files changed, 7 insertions(+), 2 deletions(-) > > diff --git a/include/linux/mm.h b/include/linux/mm.h > index 840bae5f23b6..7d84a2843193 100644 > --- a/include/linux/mm.h > +++ b/include/linux/mm.h > @@ -1134,6 +1134,11 @@ int region_intersects(resource_size_t offset, size_t size, unsigned long flags, > struct page *vmalloc_to_page(const void *addr); > unsigned long vmalloc_to_pfn(const void *addr); > > +static inline struct folio *vmalloc_to_folio(const void *addr) > +{ > + return page_folio(vmalloc_to_page(addr)); I am wondering whether we should check the return value of vmalloc_to_page()? > +} > + > /* > * Determine if an address is within the vmalloc range > * > diff --git a/kernel/events/ring_buffer.c b/kernel/events/ring_buffer.c > index c73add132618..56939dc3bf33 100644 > --- a/kernel/events/ring_buffer.c > +++ b/kernel/events/ring_buffer.c > @@ -873,9 +873,9 @@ __perf_mmap_to_page(struct perf_buffer *rb, unsigned long pgoff) > > static void perf_mmap_unmark_page(void *addr) > { > - struct page *page = vmalloc_to_page(addr); > + struct folio *folio = vmalloc_to_folio(addr); > > - page->mapping = NULL; > + folio->mapping = NULL; > } > > static void rb_free_work(struct work_struct *work)