Merge branch 'mm-hotfixes-stable' into mm-stable

.mailmap

@@ -29,6 +29,7 @@ Alexandre Belloni <alexandre.belloni@bootlin.com> <alexandre.belloni@free-electr
 Alexei Starovoitov <ast@kernel.org> <alexei.starovoitov@gmail.com>
 Alexei Starovoitov <ast@kernel.org> <ast@fb.com>
 Alexei Starovoitov <ast@kernel.org> <ast@plumgrid.com>
+Alex Hung <alexhung@gmail.com> <alex.hung@canonical.com>
 Alex Shi <alexs@kernel.org> <alex.shi@intel.com>
 Alex Shi <alexs@kernel.org> <alex.shi@linaro.org>
 Alex Shi <alexs@kernel.org> <alex.shi@linux.alibaba.com>
@@ -382,6 +383,7 @@ Santosh Shilimkar <santosh.shilimkar@oracle.org>
 Santosh Shilimkar <ssantosh@kernel.org>
 Sarangdhar Joshi <spjoshi@codeaurora.org>
 Sascha Hauer <s.hauer@pengutronix.de>
+Satya Priya <quic_c_skakit@quicinc.com> <skakit@codeaurora.org>
 S.Çağlar Onur <caglar@pardus.org.tr>
 Sean Christopherson <seanjc@google.com> <sean.j.christopherson@intel.com>
 Sean Nyekjaer <sean@geanix.com> <sean.nyekjaer@prevas.dk>

Documentation/dev-tools/kmsan.rst

@@ -67,6 +67,7 @@ uninitialized in the local variable, as well as the stack where the value was
 copied to another memory location before use.
 
 A use of uninitialized value ``v`` is reported by KMSAN in the following cases:
+
  - in a condition, e.g. ``if (v) { ... }``;
  - in an indexing or pointer dereferencing, e.g. ``array[v]`` or ``*v``;
  - when it is copied to userspace or hardware, e.g. ``copy_to_user(..., &v, ...)``;

MAINTAINERS

@@ -10288,7 +10288,7 @@ T:	git https://github.com/intel/gvt-linux.git
 F:	drivers/gpu/drm/i915/gvt/
 
 INTEL HID EVENT DRIVER
-M:	Alex Hung <alex.hung@canonical.com>
+M:	Alex Hung <alexhung@gmail.com>
 L:	platform-driver-x86@vger.kernel.org
 S:	Maintained
 F:	drivers/platform/x86/intel/hid.c

arch/loongarch/include/asm/pgtable.h

@@ -480,6 +480,7 @@ static inline pmd_t pmd_mkdirty(pmd_t pmd)
 	return pmd;
 }
 
+#define pmd_young pmd_young
 static inline int pmd_young(pmd_t pmd)
 {
 	return !!(pmd_val(pmd) & _PAGE_ACCESSED);

arch/mips/include/asm/pgtable.h

@@ -620,6 +620,7 @@ static inline pmd_t pmd_mkdirty(pmd_t pmd)
 	return pmd;
 }
 
+#define pmd_young pmd_young
 static inline int pmd_young(pmd_t pmd)
 {
 	return !!(pmd_val(pmd) & _PAGE_ACCESSED);

arch/riscv/include/asm/pgtable.h

@@ -600,6 +600,7 @@ static inline int pmd_dirty(pmd_t pmd)
 	return pte_dirty(pmd_pte(pmd));
 }
 
+#define pmd_young pmd_young
 static inline int pmd_young(pmd_t pmd)
 {
 	return pte_young(pmd_pte(pmd));

arch/s390/include/asm/pgtable.h

@@ -763,6 +763,7 @@ static inline int pmd_dirty(pmd_t pmd)
 	return (pmd_val(pmd) & _SEGMENT_ENTRY_DIRTY) != 0;
 }
 
+#define pmd_young pmd_young
 static inline int pmd_young(pmd_t pmd)
 {
 	return (pmd_val(pmd) & _SEGMENT_ENTRY_YOUNG) != 0;

arch/sparc/include/asm/pgtable_64.h

@@ -693,6 +693,7 @@ static inline unsigned long pmd_dirty(pmd_t pmd)
 	return pte_dirty(pte);
 }
 
+#define pmd_young pmd_young
 static inline unsigned long pmd_young(pmd_t pmd)
 {
 	pte_t pte = __pte(pmd_val(pmd));

arch/x86/include/asm/pgtable.h

@@ -139,6 +139,7 @@ static inline int pmd_dirty(pmd_t pmd)
 	return pmd_flags(pmd) & _PAGE_DIRTY;
 }
 
+#define pmd_young pmd_young
 static inline int pmd_young(pmd_t pmd)
 {
 	return pmd_flags(pmd) & _PAGE_ACCESSED;
@@ -1438,6 +1439,14 @@ static inline bool arch_has_hw_pte_young(void)
 	return true;
 }
 
+#ifdef CONFIG_XEN_PV
+#define arch_has_hw_nonleaf_pmd_young arch_has_hw_nonleaf_pmd_young
+static inline bool arch_has_hw_nonleaf_pmd_young(void)
+{
+	return !cpu_feature_enabled(X86_FEATURE_XENPV);
+}
+#endif
+
 #ifdef CONFIG_PAGE_TABLE_CHECK
 static inline bool pte_user_accessible_page(pte_t pte)
 {

arch/x86/kernel/traps.c

@@ -15,6 +15,7 @@
 #include <linux/context_tracking.h>
 #include <linux/interrupt.h>
 #include <linux/kallsyms.h>
+#include <linux/kmsan.h>
 #include <linux/spinlock.h>
 #include <linux/kprobes.h>
 #include <linux/uaccess.h>
@@ -301,6 +302,12 @@ static noinstr bool handle_bug(struct pt_regs *regs)
 {
 	bool handled = false;
 
+	/*
+	 * Normally @regs are unpoisoned by irqentry_enter(), but handle_bug()
+	 * is a rare case that uses @regs without passing them to
+	 * irqentry_enter().
+	 */
+	kmsan_unpoison_entry_regs(regs);
 	if (!is_valid_bugaddr(regs->ip))
 		return handled;
 

arch/x86/lib/usercopy.c

@@ -6,6 +6,7 @@
 
 #include <linux/uaccess.h>
 #include <linux/export.h>
+#include <linux/instrumented.h>
 
 #include <asm/tlbflush.h>
 
@@ -44,7 +45,9 @@ copy_from_user_nmi(void *to, const void __user *from, unsigned long n)
 	 * called from other contexts.
 	 */
 	pagefault_disable();
+	instrument_copy_from_user_before(to, from, n);
 	ret = raw_copy_from_user(to, from, n);
+	instrument_copy_from_user_after(to, from, n, ret);
 	pagefault_enable();
 
 	return ret;

arch/x86/mm/hugetlbpage.c

@@ -37,8 +37,12 @@ int pmd_huge(pmd_t pmd)
  */
 int pud_huge(pud_t pud)
 {
+#if CONFIG_PGTABLE_LEVELS > 2
 	return !pud_none(pud) &&
 		(pud_val(pud) & (_PAGE_PRESENT|_PAGE_PSE)) != _PAGE_PRESENT;
+#else
+	return 0;
+#endif
 }
 
 #ifdef CONFIG_HUGETLB_PAGE

drivers/gpu/drm/amd/display/Kconfig

@@ -5,6 +5,7 @@ menu "Display Engine Configuration"
 config DRM_AMD_DC
 	bool "AMD DC - Enable new display engine"
 	default y
+	depends on BROKEN || !CC_IS_CLANG || X86_64 || SPARC64 || ARM64
 	select SND_HDA_COMPONENT if SND_HDA_CORE
 	select DRM_AMD_DC_DCN if (X86 || PPC_LONG_DOUBLE_128)
 	help
@@ -12,6 +13,12 @@ config DRM_AMD_DC
 	  support for AMDGPU. This adds required support for Vega and
 	  Raven ASICs.
 
+	  calculate_bandwidth() is presently broken on all !(X86_64 || SPARC64 || ARM64)
+	  architectures built with Clang (all released versions), whereby the stack
+	  frame gets blown up to well over 5k.  This would cause an immediate kernel
+	  panic on most architectures.  We'll revert this when the following bug report
+	  has been resolved: https://github.com/llvm/llvm-project/issues/41896.
+
 config DRM_AMD_DC_DCN
 	def_bool n
 	help

fs/btrfs/compression.c

@@ -512,7 +512,7 @@ static u64 bio_end_offset(struct bio *bio)
 static noinline int add_ra_bio_pages(struct inode *inode,
 				     u64 compressed_end,
 				     struct compressed_bio *cb,
-				     unsigned long *pflags)
+				     int *memstall, unsigned long *pflags)
 {
 	struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
 	unsigned long end_index;
@@ -581,8 +581,10 @@ static noinline int add_ra_bio_pages(struct inode *inode,
 			continue;
 		}
 
-		if (PageWorkingset(page))
+		if (!*memstall && PageWorkingset(page)) {
 			psi_memstall_enter(pflags);
+			*memstall = 1;
+		}
 
 		ret = set_page_extent_mapped(page);
 		if (ret < 0) {
@@ -670,8 +672,8 @@ void btrfs_submit_compressed_read(struct inode *inode, struct bio *bio,
 	u64 em_len;
 	u64 em_start;
 	struct extent_map *em;
-	/* Initialize to 1 to make skip psi_memstall_leave unless needed */
-	unsigned long pflags = 1;
+	unsigned long pflags;
+	int memstall = 0;
 	blk_status_t ret;
 	int ret2;
 	int i;
@@ -727,7 +729,7 @@ void btrfs_submit_compressed_read(struct inode *inode, struct bio *bio,
 		goto fail;
 	}
 
-	add_ra_bio_pages(inode, em_start + em_len, cb, &pflags);
+	add_ra_bio_pages(inode, em_start + em_len, cb, &memstall, &pflags);
 
 	/* include any pages we added in add_ra-bio_pages */
 	cb->len = bio->bi_iter.bi_size;
@@ -807,7 +809,7 @@ void btrfs_submit_compressed_read(struct inode *inode, struct bio *bio,
 		}
 	}
 
-	if (!pflags)
+	if (memstall)
 		psi_memstall_leave(&pflags);
 
 	if (refcount_dec_and_test(&cb->pending_ios))

fs/erofs/zdata.c

@@ -1412,8 +1412,8 @@ static void z_erofs_submit_queue(struct z_erofs_decompress_frontend *f,
 	struct block_device *last_bdev;
 	unsigned int nr_bios = 0;
 	struct bio *bio = NULL;
-	/* initialize to 1 to make skip psi_memstall_leave unless needed */
-	unsigned long pflags = 1;
+	unsigned long pflags;
+	int memstall = 0;
 
 	bi_private = jobqueueset_init(sb, q, fgq, force_fg);
 	qtail[JQ_BYPASS] = &q[JQ_BYPASS]->head;
@@ -1463,14 +1463,18 @@ static void z_erofs_submit_queue(struct z_erofs_decompress_frontend *f,
 			if (bio && (cur != last_index + 1 ||
 				    last_bdev != mdev.m_bdev)) {
 submit_bio_retry:
-				if (!pflags)
-					psi_memstall_leave(&pflags);
 				submit_bio(bio);
+				if (memstall) {
+					psi_memstall_leave(&pflags);
+					memstall = 0;
+				}
 				bio = NULL;
 			}
 
-			if (unlikely(PageWorkingset(page)))
+			if (unlikely(PageWorkingset(page)) && !memstall) {
 				psi_memstall_enter(&pflags);
+				memstall = 1;
+			}
 
 			if (!bio) {
 				bio = bio_alloc(mdev.m_bdev, BIO_MAX_VECS,
@@ -1500,9 +1504,9 @@ submit_bio_retry:
 	} while (owned_head != Z_EROFS_PCLUSTER_TAIL);
 
 	if (bio) {
-		if (!pflags)
-			psi_memstall_leave(&pflags);
 		submit_bio(bio);
+		if (memstall)
+			psi_memstall_leave(&pflags);
 	}
 
 	/*

fs/hugetlbfs/inode.c

@@ -328,6 +328,12 @@ static ssize_t hugetlbfs_read_iter(struct kiocb *iocb, struct iov_iter *to)
 		} else {
 			unlock_page(page);
 
+			if (PageHWPoison(page)) {
+				put_page(page);
+				retval = -EIO;
+				break;
+			}
+
 			/*
 			 * We have the page, copy it to user space buffer.
 			 */
@@ -1111,13 +1117,6 @@ static int hugetlbfs_migrate_folio(struct address_space *mapping,
 static int hugetlbfs_error_remove_page(struct address_space *mapping,
 				struct page *page)
 {
-	struct inode *inode = mapping->host;
-	pgoff_t index = page->index;
-
-	hugetlb_delete_from_page_cache(page);
-	if (unlikely(hugetlb_unreserve_pages(inode, index, index + 1, 1)))
-		hugetlb_fix_reserve_counts(inode);
-
 	return 0;
 }
 

fs/nilfs2/dat.c

@@ -111,6 +111,13 @@ static void nilfs_dat_commit_free(struct inode *dat,
 	kunmap_atomic(kaddr);
 
 	nilfs_dat_commit_entry(dat, req);
+
+	if (unlikely(req->pr_desc_bh == NULL || req->pr_bitmap_bh == NULL)) {
+		nilfs_error(dat->i_sb,
+			    "state inconsistency probably due to duplicate use of vblocknr = %llu",
+			    (unsigned long long)req->pr_entry_nr);
+		return;
+	}
 	nilfs_palloc_commit_free_entry(dat, req);
 }
 

fs/nilfs2/segment.c

@@ -317,7 +317,7 @@ void nilfs_relax_pressure_in_lock(struct super_block *sb)
 	struct the_nilfs *nilfs = sb->s_fs_info;
 	struct nilfs_sc_info *sci = nilfs->ns_writer;
 
-	if (!sci || !sci->sc_flush_request)
+	if (sb_rdonly(sb) || unlikely(!sci) || !sci->sc_flush_request)
 		return;
 
 	set_bit(NILFS_SC_PRIOR_FLUSH, &sci->sc_flags);
@@ -2242,7 +2242,7 @@ int nilfs_construct_segment(struct super_block *sb)
 	struct nilfs_sc_info *sci = nilfs->ns_writer;
 	struct nilfs_transaction_info *ti;
 
-	if (!sci)
+	if (sb_rdonly(sb) || unlikely(!sci))
 		return -EROFS;
 
 	/* A call inside transactions causes a deadlock. */
@@ -2280,7 +2280,7 @@ int nilfs_construct_dsync_segment(struct super_block *sb, struct inode *inode,
 	struct nilfs_transaction_info ti;
 	int err = 0;
 
-	if (!sci)
+	if (sb_rdonly(sb) || unlikely(!sci))
 		return -EROFS;
 
 	nilfs_transaction_lock(sb, &ti, 0);
@@ -2776,11 +2776,12 @@ int nilfs_attach_log_writer(struct super_block *sb, struct nilfs_root *root)
 
 	if (nilfs->ns_writer) {
 		/*
-		 * This happens if the filesystem was remounted
-		 * read/write after nilfs_error degenerated it into a
-		 * read-only mount.
+		 * This happens if the filesystem is made read-only by
+		 * __nilfs_error or nilfs_remount and then remounted
+		 * read/write.  In these cases, reuse the existing
+		 * writer.
 		 */
-		nilfs_detach_log_writer(sb);
+		return 0;
 	}
 
 	nilfs->ns_writer = nilfs_segctor_new(sb, root);

fs/nilfs2/sufile.c

@@ -495,14 +495,22 @@ void nilfs_sufile_do_free(struct inode *sufile, __u64 segnum,
 int nilfs_sufile_mark_dirty(struct inode *sufile, __u64 segnum)
 {
 	struct buffer_head *bh;
+	void *kaddr;
+	struct nilfs_segment_usage *su;
 	int ret;
 
+	down_write(&NILFS_MDT(sufile)->mi_sem);
 	ret = nilfs_sufile_get_segment_usage_block(sufile, segnum, 0, &bh);
 	if (!ret) {
 		mark_buffer_dirty(bh);
 		nilfs_mdt_mark_dirty(sufile);
+		kaddr = kmap_atomic(bh->b_page);
+		su = nilfs_sufile_block_get_segment_usage(sufile, segnum, bh, kaddr);
+		nilfs_segment_usage_set_dirty(su);
+		kunmap_atomic(kaddr);
 		brelse(bh);
 	}
+	up_write(&NILFS_MDT(sufile)->mi_sem);
 	return ret;
 }
 

fs/nilfs2/super.c

@@ -1133,8 +1133,6 @@ static int nilfs_remount(struct super_block *sb, int *flags, char *data)
 	if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb))
 		goto out;
 	if (*flags & SB_RDONLY) {
-		/* Shutting down log writer */
-		nilfs_detach_log_writer(sb);
 		sb->s_flags |= SB_RDONLY;
 
 		/*