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

[Marcelo Tosatti]

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.