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Tsirkin" , "Theodore Ts'o" , Albert Ou , Alexander Duyck , Alexander Gordeev , Alexander Viro , Alexandra Winter , Andreas Dilger , Andrew Lunn , Anna Schumaker , Anton Yakovlev , Arnaldo Carvalho de Melo , Aswin Karuvally , Borislav Petkov , Carlos Maiolino , Catalin Marinas , Chao Yu , Christian Borntraeger , Christian Brauner , Claudio Imbrenda , Dave Hansen , David Airlie , Dominique Martinet , Dongsheng Yang , Eric Dumazet , Eric Van Hensbergen , Heiko Carstens , Herbert Xu , Ingo Molnar , Jaegeuk Kim , Jakub Kicinski , Jani Nikula , Janosch Frank , Jaroslav Kysela , Jens Axboe , Joonas Lahtinen , Latchesar Ionkov , Linus Walleij , Madhavan Srinivasan , Mark Brown , Michael Ellerman , Miklos Szeredi , Namhyung Kim , Palmer Dabbelt , Paolo Abeni , Paolo Bonzini , Paul Walmsley , Peter Zijlstra , Rodrigo Vivi , Sean Christopherson , Simona Vetter , Takashi Iwai , Thomas Gleixner , Trond Myklebust , Tvrtko Ursulin , Vasily Gorbik , Will Deacon , Yury Norov , Zheng Gu Cc: Yury Norov , linux-kernel@vger.kernel.org, x86@kernel.org, linux-arm-kernel@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, kvm@vger.kernel.org, linux-s390@vger.kernel.org, linux-block@vger.kernel.org, intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, dm-devel@lists.linux.dev, netdev@vger.kernel.org, linux-spi@vger.kernel.org, linux-ext4@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net, linux-fsdevel@vger.kernel.org, linux-xfs@vger.kernel.org, linux-nfs@vger.kernel.org, linux-crypto@vger.kernel.org, linux-mm@kvack.org, linux-perf-users@vger.kernel.org, v9fs@lists.linux.dev, virtualization@lists.linux.dev, linux-sound@vger.kernel.org Subject: [PATCH 4/8] core: use rest_of_page() macro where appropriate Date: Tue, 3 Mar 2026 20:27:12 -0500 Message-ID: <20260304012717.201797-5-ynorov@nvidia.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260304012717.201797-1-ynorov@nvidia.com> References: <20260304012717.201797-1-ynorov@nvidia.com> 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Switch core and library code to using the macro. No functional changes intended. Signed-off-by: Yury Norov --- include/crypto/scatterwalk.h | 2 +- include/linux/highmem.h | 24 ++++++++++-------------- include/linux/iomap.h | 2 +- include/linux/iov_iter.h | 3 +-- kernel/events/ring_buffer.c | 2 +- lib/bitmap-str.c | 2 +- lib/iov_iter.c | 5 ++--- 7 files changed, 17 insertions(+), 23 deletions(-) diff --git a/include/crypto/scatterwalk.h b/include/crypto/scatterwalk.h index 624fab589c2c..c671d5383c12 100644 --- a/include/crypto/scatterwalk.h +++ b/include/crypto/scatterwalk.h @@ -73,7 +73,7 @@ static inline unsigned int scatterwalk_clamp(struct scatter_walk *walk, * page due to the data not being aligned to the algorithm's alignmask. */ if (IS_ENABLED(CONFIG_HIGHMEM)) - limit = PAGE_SIZE - offset_in_page(walk->offset); + limit = rest_of_page(walk->offset); else limit = PAGE_SIZE; diff --git a/include/linux/highmem.h b/include/linux/highmem.h index af03db851a1d..05528ba886fb 100644 --- a/include/linux/highmem.h +++ b/include/linux/highmem.h @@ -507,12 +507,10 @@ static inline void memcpy_folio(struct folio *dst_folio, size_t dst_off, const char *src = kmap_local_folio(src_folio, src_off); size_t chunk = len; - if (folio_test_highmem(dst_folio) && - chunk > PAGE_SIZE - offset_in_page(dst_off)) - chunk = PAGE_SIZE - offset_in_page(dst_off); - if (folio_test_highmem(src_folio) && - chunk > PAGE_SIZE - offset_in_page(src_off)) - chunk = PAGE_SIZE - offset_in_page(src_off); + if (folio_test_highmem(dst_folio) && chunk > rest_of_page(dst_off)) + chunk = rest_of_page(dst_off); + if (folio_test_highmem(src_folio) && chunk > rest_of_page(src_off)) + chunk = rest_of_page(src_off); memcpy(dst, src, chunk); kunmap_local(src); kunmap_local(dst); @@ -580,9 +578,8 @@ static inline void memcpy_from_folio(char *to, struct folio *folio, const char *from = kmap_local_folio(folio, offset); size_t chunk = len; - if (folio_test_partial_kmap(folio) && - chunk > PAGE_SIZE - offset_in_page(offset)) - chunk = PAGE_SIZE - offset_in_page(offset); + if (folio_test_partial_kmap(folio) && chunk > rest_of_page(offset)) + chunk = rest_of_page(offset); memcpy(to, from, chunk); kunmap_local(from); @@ -608,9 +605,8 @@ static inline void memcpy_to_folio(struct folio *folio, size_t offset, char *to = kmap_local_folio(folio, offset); size_t chunk = len; - if (folio_test_partial_kmap(folio) && - chunk > PAGE_SIZE - offset_in_page(offset)) - chunk = PAGE_SIZE - offset_in_page(offset); + if (folio_test_partial_kmap(folio) && chunk > rest_of_page(offset)) + chunk = rest_of_page(offset); memcpy(to, from, chunk); kunmap_local(to); @@ -642,7 +638,7 @@ static inline __must_check void *folio_zero_tail(struct folio *folio, size_t len = folio_size(folio) - offset; if (folio_test_partial_kmap(folio)) { - size_t max = PAGE_SIZE - offset_in_page(offset); + size_t max = rest_of_page(offset); while (len > max) { memset(kaddr, 0, max); @@ -680,7 +676,7 @@ static inline void folio_fill_tail(struct folio *folio, size_t offset, VM_BUG_ON(offset + len > folio_size(folio)); if (folio_test_partial_kmap(folio)) { - size_t max = PAGE_SIZE - offset_in_page(offset); + size_t max = rest_of_page(offset); while (len > max) { memcpy(to, from, max); diff --git a/include/linux/iomap.h b/include/linux/iomap.h index 99b7209dabd7..6ae549192adb 100644 --- a/include/linux/iomap.h +++ b/include/linux/iomap.h @@ -142,7 +142,7 @@ static inline void *iomap_inline_data(const struct iomap *iomap, loff_t pos) */ static inline bool iomap_inline_data_valid(const struct iomap *iomap) { - return iomap->length <= PAGE_SIZE - offset_in_page(iomap->inline_data); + return iomap->length <= rest_of_page(iomap->inline_data); } /* diff --git a/include/linux/iov_iter.h b/include/linux/iov_iter.h index f9a17fbbd398..13a9ee653ef8 100644 --- a/include/linux/iov_iter.h +++ b/include/linux/iov_iter.h @@ -227,8 +227,7 @@ size_t iterate_xarray(struct iov_iter *iter, size_t len, void *priv, void *priv2 while (flen) { void *base = kmap_local_folio(folio, offset); - part = min_t(size_t, flen, - PAGE_SIZE - offset_in_page(offset)); + part = min_t(size_t, flen, rest_of_page(offset)); remain = step(base, progress, part, priv, priv2); kunmap_local(base); diff --git a/kernel/events/ring_buffer.c b/kernel/events/ring_buffer.c index 3e7de2661417..1db2868b90c9 100644 --- a/kernel/events/ring_buffer.c +++ b/kernel/events/ring_buffer.c @@ -590,7 +590,7 @@ long perf_output_copy_aux(struct perf_output_handle *aux_handle, to &= (rb->aux_nr_pages << PAGE_SHIFT) - 1; do { - tocopy = PAGE_SIZE - offset_in_page(from); + tocopy = rest_of_page(from); if (to > from) tocopy = min(tocopy, to - from); if (!tocopy) diff --git a/lib/bitmap-str.c b/lib/bitmap-str.c index be745209507a..a357342d5d6c 100644 --- a/lib/bitmap-str.c +++ b/lib/bitmap-str.c @@ -58,7 +58,7 @@ EXPORT_SYMBOL(bitmap_parse_user); int bitmap_print_to_pagebuf(bool list, char *buf, const unsigned long *maskp, int nmaskbits) { - ptrdiff_t len = PAGE_SIZE - offset_in_page(buf); + ptrdiff_t len = rest_of_page(buf); return list ? scnprintf(buf, len, "%*pbl\n", nmaskbits, maskp) : scnprintf(buf, len, "%*pb\n", nmaskbits, maskp); diff --git a/lib/iov_iter.c b/lib/iov_iter.c index 0a63c7fba313..c7e812349ca2 100644 --- a/lib/iov_iter.c +++ b/lib/iov_iter.c @@ -483,9 +483,8 @@ size_t copy_folio_from_iter_atomic(struct folio *folio, size_t offset, char *to = kmap_local_folio(folio, offset); n = bytes - copied; - if (folio_test_partial_kmap(folio) && - n > PAGE_SIZE - offset_in_page(offset)) - n = PAGE_SIZE - offset_in_page(offset); + if (folio_test_partial_kmap(folio) && n > rest_of_page(offset)) + n = rest_of_page(offset); pagefault_disable(); n = __copy_from_iter(to, n, i); -- 2.43.0