Mlock: doc, patch grouping and error return cleanups
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- v1 Latest6 patches 11 repliesIn review
Patches in v1 No applies recorded yet
| # | Subject and files | Size | Replies | Applied |
|---|---|---|---|---|
| 1/6 | Mlock: fix __mlock_vma_pages_range comment blockmm/ | +12 | 0 replies | |
| 2/6 | Mlock: backout locked_vm adjustment during mmap()mm/ mm/ | +14 | 0 replies | |
| 3/6 | Mlock: resubmit locked_vm adjustment as separate patchmm/ mm/ mm/ | +22 | 0 replies | |
| 4/6 | Mlock: fix return value for munmap/mlock vma racemm/ | +2 | 1 reply | |
| 5/6 | Mlock: revert mainline handling of mlock error returnmm/ | +2 | 2 replies | |
| 6/6 | Mlock: make mlock error return Posixly Correctmm/ mm/ | +25 | 7 replies |
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Cover letter [Patch 0/6] Mlock: doc, patch grouping and error return cleanups
The six patches introduced by this message are against:
2.6.27-rc3-mmotm-080819-0259
These patches replace the series of 5 RFC patches posted by Kosaki Motohiro at:
http://marc.info/?l=linux-mm&m=121843816412096&w=4
Patch 1/6 is a rework of Kosaki-san's cleanup of the __mlock_vma_pages_range() comment block. I tried to follow kerneldoc format. Randy will tell me if I made a mistake :)
Patch 2/6 is a rework of Kosaki-san's patch to remove the locked_vm adjustments for "special vmas" during mmap() processing. Kosaki-san wanted to "kill" this adjustment. After discussion, he requested that it be resubmitted as a separate patch. This is the first step in providing the separate patch [even tho' I consider this part of correctly "handling mlocked pages during mmap()..."].
Patch 3/6 resubmits the locked_vm adjustment during mmap(MAP_LOCKED)) to match the explicit mlock() behavior.
Patch 4/6 is Kosaki-san's patch to change the error return for mlock when, after downgrading the mmap semaphore to read during population of the vma and switching back to write lock as our callers expect, the vma that we just locked no longer covers the range we expected. See the description.
Patch 5/6 backs out a mainline patch to make_pages_present() to adjust the error return to match the Posix specification for mlock error returns. make_pages_present() is used by other than mlock, so this isn't really the appropriate place to make the change, even tho' apparently only mlock() looks at the return value from make_pages_present().
Patch 6/6 fixes the mlock error return to be Posixly Correct in the appropriate [IMO] paths in mlock.c.
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