Merge branch 'akpm' (patches from Andrew)

Merge misc fixes from Andrew Morton:
"Five fixes.

Subsystems affected by this patch series: MAINTAINERS, mm/pagemap,
mm/swap, and mm/hugetlb"

* emailed patches from Andrew Morton <[e-mail]>:
mm: khugepaged: recalculate min_free_kbytes after memory hotplug as expected by khugepaged
mm: validate inode in mapping_set_error()
mm: mmap: Fix general protection fault in unlink_file_vma()
MAINTAINERS: Antoine Tenart's email address
MAINTAINERS: change hardening mailing list

.mailmap

···
 Andrew Vasquez <[e-mail]>
 Andrey Ryabinin <[e-mail]> <[e-mail]>
 Andy Adamson <[e-mail]>
-Antoine Tenart <[e-mail]>
+Antoine Tenart <[e-mail]> <[e-mail]>
+Antoine Tenart <[e-mail]> <[e-mail]>
 Antonio Ospite <[e-mail]> <[e-mail]>
 Archit Taneja <[e-mail]>
 Ard Biesheuvel <[e-mail]> <[e-mail]>
···
 Linas Vepstas <[e-mail]>
 Linus Lüssing <[e-mail]> <[e-mail]>
 Linus Lüssing <[e-mail]> <[e-mail]>
+<[e-mail]> <[e-mail]>
 Li Yang <[e-mail]> <[e-mail]>
 Li Yang <[e-mail]> <[e-mail]>
 Lukasz Luba <[e-mail]> <[e-mail]>

MAINTAINERS

···
 
 ARM/Annapurna Labs ALPINE ARCHITECTURE
 M:	Tsahee Zidenberg <[e-mail]>
-M:	Antoine Tenart <[e-mail]>
+M:	Antoine Tenart <[e-mail]>
 L:	[e-mail] (moderated for non-subscribers)
 S:	Maintained
 F:	arch/arm/boot/dts/alpine*
···
 GCC PLUGINS
 M:	Kees Cook <[e-mail]>
 R:	Emese Revfy <[e-mail]>
-L:	[e-mail]
+L:	[e-mail]
 S:	Maintained
 F:	Documentation/kbuild/gcc-plugins.rst
 F:	scripts/Makefile.gcc-plugins
···
 K:	\b(ABS|SYN)_MT_
 
 INSIDE SECURE CRYPTO DRIVER
-M:	Antoine Tenart <[e-mail]>
+M:	Antoine Tenart <[e-mail]>
 L:	[e-mail]
 S:	Maintained
 F:	drivers/crypto/inside-secure/
···
 LEAKING_ADDRESSES
 M:	Tobin C. Harding <[e-mail]>
 M:	Tycho Andersen <[e-mail]>
-L:	[e-mail]
+L:	[e-mail]
 S:	Maintained
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/tobin/leaks.git
 F:	scripts/leaking_addresses.pl

include/linux/khugepaged.h

···
 extern void __khugepaged_exit(struct mm_struct *mm);
 extern int khugepaged_enter_vma_merge(struct vm_area_struct *vma,
 				      unsigned long vm_flags);
+extern void khugepaged_min_free_kbytes_update(void);
 #ifdef CONFIG_SHMEM
 extern void collapse_pte_mapped_thp(struct mm_struct *mm, unsigned long addr);
 #else
···
 }
 static inline void collapse_pte_mapped_thp(struct mm_struct *mm,
 					   unsigned long addr)
+{
+}
+
+static inline void khugepaged_min_free_kbytes_update(void)
 {
 }
 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */

include/linux/pagemap.h

···
 	__filemap_set_wb_err(mapping, error);
 
 	/* Record it in superblock */
-	errseq_set(&mapping->host->i_sb->s_wb_err, error);
+	if (mapping->host)
+		errseq_set(&mapping->host->i_sb->s_wb_err, error);
 
 	/* Record it in flags for now, for legacy callers */
 	if (error == -ENOSPC)

mm/khugepaged.c

···
 #define CREATE_TRACE_POINTS
 #include <trace/events/huge_memory.h>
 
+static struct task_struct *khugepaged_thread __read_mostly;
+static DEFINE_MUTEX(khugepaged_mutex);
+
 /* default scan 8*512 pte (or vmas) every 30 second */
 static unsigned int khugepaged_pages_to_scan __read_mostly;
 static unsigned int khugepaged_pages_collapsed;
···
 
 int start_stop_khugepaged(void)
 {
-	static struct task_struct *khugepaged_thread __read_mostly;
-	static DEFINE_MUTEX(khugepaged_mutex);
 	int err = 0;
 
 	mutex_lock(&khugepaged_mutex);
···
 fail:
 	mutex_unlock(&khugepaged_mutex);
 	return err;
+}
+
+void khugepaged_min_free_kbytes_update(void)
+{
+	mutex_lock(&khugepaged_mutex);
+	if (khugepaged_enabled() && khugepaged_thread)
+		set_recommended_min_free_kbytes();
+	mutex_unlock(&khugepaged_mutex);
 }

mm/mmap.c

···
 			merge = vma_merge(mm, prev, vma->vm_start, vma->vm_end, vma->vm_flags,
 				NULL, vma->vm_file, vma->vm_pgoff, NULL, NULL_VM_UFFD_CTX);
 			if (merge) {
-				fput(file);
+				/* ->mmap() can change vma->vm_file and fput the original file. So
+				 * fput the vma->vm_file here or we would add an extra fput for file
+				 * and cause general protection fault ultimately.
+				 */
+				fput(vma->vm_file);
 				vm_area_free(vma);
 				vma = merge;
 				/* Update vm_flags and possible addr to pick up the change. We don't

mm/page_alloc.c

···
 #include <linux/nmi.h>
 #include <linux/psi.h>
 #include <linux/padata.h>
+#include <linux/khugepaged.h>
 
 #include <asm/sections.h>
 #include <asm/tlbflush.h>
···
 	setup_min_unmapped_ratio();
 	setup_min_slab_ratio();
 #endif
+
+	khugepaged_min_free_kbytes_update();
 
 	return 0;
 }