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    SubjectRe: 3rd version of R/W mmap_sem patch available


    On Mon, 19 Mar 2001, Linus Torvalds wrote:

    >
    > There is a 2.4.3-pre5 in the test-directory on ftp.kernel.org.
    >
    > The complete changelog is appended, but the biggest recent change is the
    > mmap_sem change, which I updated with new locking rules for pte/pmd_alloc
    > to avoid the race on the actual page table build.
    >
    > This has only been tested on i386 without PAE, and is known to break other
    > architectures. Ingo, mind checking what PAE needs? Generally, the changes
    > are simple, and really only implies changing the pte/pmd allocation
    > functions to _only_ allocate (ie removing the stuff that actually modifies
    > the page tables, as that is now handled by generic code), and to make sure
    > that the "pgd/pmd_populate()" functions do the right thing.
    >
    > I have also removed the xxx_kernel() functions - for architectures that
    > need them, I suspect that the right approach is to just make the
    > "populate" funtions notice when "mm" is "init_mm", the kernel context.
    > That removed a lot of duplicate code that had little good reason.
    >
    > This pre-release is meant mainly as a synchronization point for mm
    > developers, not for generic use.
    >
    > Thanks,
    >
    > Linus
    >
    >
    > -----
    > -pre5:
    > - Rik van Riel and others: mm rw-semaphore (ps/top ok when swapping)
    > - IDE: 256 sectors at a time is legal, but apparently confuses some
    > drives. Max out at 255 sectors instead.

    Could the IDE one cause corruption ?

    EXT2-fs error (device ide0(3,1)): ext2_free_blocks: bit already cleared
    for block 6211

    Just hitted this now with pre3.

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