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Background: I've implemented 1K/2K page tables for s390. These sub-page
page tables are required to properly support the s390 virtualization
instruction with KVM. The SIE instruction requires that the page tables
have 256 page table entries (pte) followed by 256 page status table entries
(pgste). The pgstes are only required if the process is using the SIE
instruction. The pgstes are updated by the hardware and by the hypervisor
for a number of reasons, one of them is dirty and reference bit tracking.
To avoid wasting memory the standard pte table allocation should return
1K/2K (31/64 bit) and 2K/4K if the process is using SIE.
Problem: Page size on s390 is 4K, page table size is 1K or 2K. That means
the s390 version for pte_alloc_one cannot return a pointer to a struct
page. Trouble is that with the CONFIG_HIGHPTE feature on x86 pte_alloc_one
cannot return a pointer to a pte either, since that would require more than
32 bit for the return value of pte_alloc_one (and the pte * would not be
accessible since its not kmapped).
Solution: The only solution I found to this dilemma is a new typedef: a
pgtable_t. For s390 pgtable_t will be a (pte *) - to be introduced with a
later patch. For everybody else it will be a (struct page *). The
additional problem with the initialization of the ptl lock and the
NR_PAGETABLE accounting is solved with a constructor pgtable_page_ctor and
a destructor pgtable_page_dtor. The page table allocation and free
functions need to call these two whenever a page table page is allocated or
freed. pmd_populate will get a pgtable_t instead of a struct page pointer.
To get the pgtable_t back from a pmd entry that has been installed with
pmd_populate a new function pmd_pgtable is added. It replaces the pmd_page
call in free_pte_range and apply_to_pte_range.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: <linux-arch@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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(with Martin Schwidefsky <schwidefsky@de.ibm.com>)
The pgd/pud/pmd/pte page table allocation functions get a mm_struct pointer as
first argument. The free functions do not get the mm_struct argument. This
is 1) asymmetrical and 2) to do mm related page table allocations the mm
argument is needed on the free function as well.
[kamalesh@linux.vnet.ibm.com: i386 fix]
[akpm@linux-foundation.org: coding-syle fixes]
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: <linux-arch@vger.kernel.org>
Signed-off-by: Kamalesh Babulal <kamalesh@linux.vnet.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
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First thing mm.h does is including sched.h solely for can_do_mlock() inline
function which has "current" dereference inside. By dealing with can_do_mlock()
mm.h can be detached from sched.h which is good. See below, why.
This patch
a) removes unconditional inclusion of sched.h from mm.h
b) makes can_do_mlock() normal function in mm/mlock.c
c) exports can_do_mlock() to not break compilation
d) adds sched.h inclusions back to files that were getting it indirectly.
e) adds less bloated headers to some files (asm/signal.h, jiffies.h) that were
getting them indirectly
Net result is:
a) mm.h users would get less code to open, read, preprocess, parse, ... if
they don't need sched.h
b) sched.h stops being dependency for significant number of files:
on x86_64 allmodconfig touching sched.h results in recompile of 4083 files,
after patch it's only 3744 (-8.3%).
Cross-compile tested on
all arm defconfigs, all mips defconfigs, all powerpc defconfigs,
alpha alpha-up
arm
i386 i386-up i386-defconfig i386-allnoconfig
ia64 ia64-up
m68k
mips
parisc parisc-up
powerpc powerpc-up
s390 s390-up
sparc sparc-up
sparc64 sparc64-up
um-x86_64
x86_64 x86_64-up x86_64-defconfig x86_64-allnoconfig
as well as my two usual configs.
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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This fixes some sparse warnings.
pgtable-32.c:15:6: warning: symbol 'pgd_init' was not declared. Should it be static?
pgtable-32.c:32:13: warning: symbol 'pagetable_init' was not declared. Should it be static?
Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
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Derived from Peter Watkins <treestem@gmail.com>'s work.
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
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Signed-off-by: David Woodhouse <dwmw2@infradead.org>
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the compacrapability headers.
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
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Start cleaning 32-bit vs. 64-bit configuration.
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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Thisintroduces __GFP_ZERO as an additional gfp_mask element to allow to
request zeroed pages from the page allocator:
- Modifies the page allocator so that it zeroes memory if __GFP_ZERO is
set
- Replace all page zeroing after allocating pages by prior allocations with
allocations using __GFP_ZERO
Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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From: Ralf Baechle <ralf@linux-mips.org>
- more work on resurrecting AMD Alchemy platforms
- cleanup of unnecessary <asm/pgalloc.h> inclusions
- update default config files
- cleanup 32-bit compat ioctl code
- support for Montum Jaguar ATX
- workarounds for early revs of the RM9000
- fixes for RM5000 and RM7000 cache handling
- add support for PMC-Sierra Yosemite eval board
- further cleanup and bugfixes for SGI IP27
- make LASAT and VR41xx build and work in 2.6
- improved SGI IP32 support
- plenty of small fixes
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From: Ralf Baechle <ralf@linux-mips.org>
Below following 125547 lines of patches, all to arch/mips and
include/asm-mips. I'm going to send the remaining stuff of which the one
or other bit may need to be discussed in smaller bits.
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Here's another MIPS update. The patch is huge because it completly
folds mips64 into mips, thereby eleminating 41010 lines of code.
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This contains all the generic 32-bit MIPS code, so all arch/mips/ and
include/asm-mips/ stuff.
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Remove all the open-coded retry loops in various architectures, use
__GFP_REPEAT.
It could be that at some time in the future we change __GFP_REPEAT to give up
after ten seconds or so, so all the checks for failed allocations are
retained.
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- Al Viro: fix up silly problem in swapfile filp cleanups in 2.5.2
- Tachino Nobuhiro: fix another error return for swapfile filp code
- Robert Love: merge some of Ingo's scheduler fixes
- David Miller: networking, sparc and some scsi driver fixes
- Tim Waugh: parport update
- OGAWA Hirofumi: fatfs cleanups and bugfixes
- Roland Dreier: fix vsscanf buglets.
- Ben LaHaise: include file cleanup
- Andre Hedrick: IDE taskfile update
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- make sure "sync()" doesn't effectively lock up the machine by
overloading all the IO resources
- fix up some network memory allocations that don't wan tto wait on IO.
- merge with Alan (including MIPS update)
- Jeff Garzik: network driver updates.
- Al Viro: System V FS update (write capability, page cache, mondo cleanups)
- Kai Germaschewski: ISDN cleanups, TURBOPAM driver by Stelian Pop
- Ben Fennema: UDF update (time handling, i_blocks fix)
- Neil Brown: md error handling improvements, knfsd file handle compatibility
- Paul Mackerras: PPC update
- Jakub Jelinek: fix up kernel linker scripts to accept .rodata better
- Patrick Mochel: fix PME handling in pci_enable_wake()
- Chris Mason: reiserfs PF_MEMALLOC handling
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- Johannes Erdfelt: USB updates
- David Howells: more rw-sem stuff
- David Miller: network callback cleanups and fixes
- Jan Harkes: make Coda use the proper VFS layer interfaces, so that it can use
"non-traditional-unix" filesystems without inode numbers for backing store.
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