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78fb907626
linux/arch/s390/mm
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Martin Schwidefsky 78fb907626 s390/mm: simplify page table alloc/free code 
With the removal of the dynamic reallocation of page tables for
KVM (see git commit 0b46e0a3ec)
the page table allocation / freeing code can be simplified.

The page table free code can now use the alloc_pgste bit in the
mm context to decide if a page table is 2K or 4K, there is no mix
of different sized page tables anymore. This eliminates the need
to use "page->_mapcount == 0" to check for 4K page table.

Use the lower two bits in page->_mapcount to indicate which
2K fragments of the 4K page are in use.

As 31-bit support is gone, remove the two defines ALLOC_ORDER
and FRAG_MASK and use the constants directly where appropriate.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2015-08-19 10:41:19 +02:00
..
cmm.c s390: convert use of typedef ctl_table to struct ctl_table 2013-10-28 08:36:25 +01:00
dump_pagetables.c s390: remove 31 bit support 2015-03-25 11:49:33 +01:00
extable.c s390/exceptions: switch to relative exception table entries 2012-09-26 15:45:10 +02:00
extmem.c s390: remove 31 bit support 2015-03-25 11:49:33 +01:00
fault.c s390: remove unneeded sizeof(void *) comparisons 2015-08-19 10:03:44 +02:00
gup.c s390/mm: enable gup code for NUMA 2015-08-03 10:06:12 +02:00
hugetlbpage.c s390/mm: forward check for huge pmds to pmd_large() 2015-06-25 17:00:35 -07:00
init.c s390/numa: add core infrastructure 2015-08-03 18:40:25 +02:00
maccess.c s390/maccess: improve s390_kernel_write() 2015-03-25 11:49:44 +01:00
Makefile s390/mem_detect: move memory detection code to mm folder 2013-05-02 15:50:22 +02:00
mem_detect.c s390/sclp: unify basic sclp access by exposing "struct sclp" 2015-05-13 09:58:17 +02:00
mmap.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux 2015-04-14 20:51:44 -07:00
page-states.c s390/cmma: remove "cmma disable" code in case of dump again 2014-05-20 08:58:42 +02:00
pageattr.c s390: remove 31 bit support 2015-03-25 11:49:33 +01:00
pgtable.c s390/mm: simplify page table alloc/free code 2015-08-19 10:41:19 +02:00
vmem.c s390: remove 31 bit support 2015-03-25 11:49:33 +01:00