The patch titled
Subject: mm-allow-page-fault-handlers-to-perform-the-cow-fix
has been added to the -mm tree. Its filename is
mm-allow-page-fault-handlers-to-perform-the-cow-fix.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-allow-page-fault-handlers-to-perform-the-cow-fix.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-allow-page-fault-handlers-to-perform-the-cow-fix.patch
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------------------------------------------------------
From: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Subject: mm-allow-page-fault-handlers-to-perform-the-cow-fix
Cc: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Cc: Matthew Wilcox <matthew.r.wilcox@xxxxxxxxx>
Cc: Andreas Dilger <andreas.dilger@xxxxxxxxx>
Cc: Boaz Harrosh <boaz@xxxxxxxxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxx>
Cc: Dave Chinner <david@xxxxxxxxxxxxx>
Cc: Jan Kara <jack@xxxxxxx>
Cc: Jens Axboe <axboe@xxxxxxxxx>
Cc: Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxxxx>
Cc: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
Cc: Ross Zwisler <ross.zwisler@xxxxxxxxxxxxxxx>
Cc: Theodore Ts'o <tytso@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/memory.c | 12 ++++++++++--
1 file changed, 10 insertions(+), 2 deletions(-)
diff -puN mm/memory.c~mm-allow-page-fault-handlers-to-perform-the-cow-fix mm/memory.c
--- a/mm/memory.c~mm-allow-page-fault-handlers-to-perform-the-cow-fix
+++ a/mm/memory.c
@@ -2961,7 +2961,11 @@ static int do_cow_fault(struct mm_struct
unlock_page(fault_page);
page_cache_release(fault_page);
} else {
- mutex_unlock(&vma->vm_file->f_mapping->i_mmap_mutex);
+ /*
+ * DAX doesn't have a page to lock, so it uses
+ * i_mmap_lock()
+ */
+ i_mmap_unlock_read(&vma->vm_file->f_mapping);
}
goto uncharge_out;
}
@@ -2973,7 +2977,11 @@ static int do_cow_fault(struct mm_struct
unlock_page(fault_page);
page_cache_release(fault_page);
} else {
- mutex_unlock(&vma->vm_file->f_mapping->i_mmap_mutex);
+ /*
+ * DAX doesn't have a page to lock, so it uses
+ * i_mmap_lock()
+ */
+ i_mmap_unlock_read(&vma->vm_file->f_mapping);
}
return ret;
uncharge_out:
_
Patches currently in -mm which might be from akpm@xxxxxxxxxxxxxxxxxxxx are
i-need-old-gcc.patch
arch-alpha-kernel-systblss-remove-debug-check.patch
fanotify-dont-recalculate-a-marks-mask-if-only-the-ignored-mask-changed-checkpatch-fixes.patch
fanotify-dont-set-fan_ondir-implicitly-on-a-marks-ignored-mask-checkpatch-fixes.patch
input-route-kbd-leds-through-the-generic-leds-layer.patch
o2dlm-fix-null-pointer-dereference-in-o2dlm_blocking_ast_wrapper.patch
ocfs2-add-functions-to-add-and-remove-inode-in-orphan-dir.patch
mm.patch
mm-fix-xip-fault-vs-truncate-race-fix.patch
mm-allow-page-fault-handlers-to-perform-the-cow-fix.patch
daxext2-replace-the-xip-page-fault-handler-with-the-dax-page-fault-handler-fix.patch
dax-add-dax_zero_page_range-fix.patch
mm-replace-remap_file_pages-syscall-with-emulation.patch
mm-page_allocc-__alloc_pages_nodemask-dont-alter-arg-gfp_mask.patch
x86-add-pmd_-for-thp-fix.patch
sparc-add-pmd_-for-thp-fix.patch
do_shared_fault-check-that-mmap_sem-is-held.patch
task_mmu-add-user-space-support-for-resetting-mm-hiwater_rss-peak-rss.patch
lib-bitmap-update-bitmap_onto-to-unsigned-checkpatch-fixes.patch
lib-bitmap-change-parameters-of-bitmap_fold-to-unsigned-fix.patch
hexdump-makes-it-return-amount-of-bytes-placed-in-buffer-fix.patch
fs-befs-linuxvfsc-remove-unnecessary-casting-fix.patch
linux-next.patch
drivers-gpio-gpio-zevioc-fix-build.patch
journal_add_journal_head-debug.patch
journal_add_journal_head-debug-fix.patch
kernel-forkc-export-kernel_thread-to-modules.patch
mutex-subsystem-synchro-test-module.patch
slab-leaks3-default-y.patch
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