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authorMichael Bestas <mkbestas@lineageos.org>2020-09-19 12:58:54 +0300
committerMichael Bestas <mkbestas@lineageos.org>2020-09-19 12:58:54 +0300
commit3b601dd398b0f8a66744c0ecf384a6cbe65e36e7 (patch)
tree570d5895dfced5d2e443a7f9b8f6fa5f9a7560f3 /include/linux/mm.h
parenta638073161e90ac6dc0ffc2e27cbc4bcd3ff88c3 (diff)
parent5fd2d19eeb9767339e1338eb6789495d1812065b (diff)
Merge branch 'android-4.4-p' of https://android.googlesource.com/kernel/common into lineage-17.1-caf-msm8998
This brings LA.UM.8.4.r1-05900-8x98.0 up to date with https://android.googlesource.com/kernel/common/ android-4.4-p at commit: 5fd2d19eeb976 Merge 4.4.236 into android-4.4-p Conflicts: drivers/scsi/ufs/ufshcd.c Change-Id: I22282a0d571bdb72f50d3fc1e2cee4443de1f7f4
Diffstat (limited to 'include/linux/mm.h')
-rw-r--r--include/linux/mm.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/mm.h b/include/linux/mm.h
index ab42cba931df..af0595bef9c8 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1140,6 +1140,10 @@ void unmap_vmas(struct mmu_gather *tlb, struct vm_area_struct *start_vma,
* followed by taking the mmap_sem for writing before modifying the
* vmas or anything the coredump pretends not to change from under it.
*
+ * It also has to be called when mmgrab() is used in the context of
+ * the process, but then the mm_count refcount is transferred outside
+ * the context of the process to run down_write() on that pinned mm.
+ *
* NOTE: find_extend_vma() called from GUP context is the only place
* that can modify the "mm" (notably the vm_start/end) under mmap_sem
* for reading and outside the context of the process, so it is also