Martin Schwidefsky cd94154cc6 [S390] fix tlb flushing for page table pages ... Git commit 36409f6353 "use generic RCU page-table freeing code" introduced a tlb flushing bug. Partially revert the above git commit and go back to s390 specific page table flush code. For s390 the TLB can contain three types of entries, "normal" TLB page-table entries, TLB combined region-and-segment-table (CRST) entries and real-space entries. Linux does not use real-space entries which leaves normal TLB entries and CRST entries. The CRST entries are intermediate steps in the page-table translation called translation paths. For example a 4K page access in a three-level page table setup will create two CRST TLB entries and one page-table TLB entry. The advantage of that approach is that a page access next to the previous one can reuse the CRST entries and needs just a single read from memory to create the page-table TLB entry. The disadvantage is that the TLB flushing rules are more complicated, before any page-table may be freed the TLB needs to be flushed. In short: the generic RCU page-table freeing code is incorrect for the CRST entries, in particular the check for mm_users < 2 is troublesome. This is applicable to 3.0+ kernels. Cc: <stable@vger.kernel.org> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>		2012-04-11 14:28:24 +02:00
..
cmm.c
extmem.c
fault.c	Disintegrate asm/system.h for S390	2012-03-28 18:30:02 +01:00
gup.c
hugetlbpage.c
init.c	Disintegrate asm/system.h for S390	2012-03-28 18:30:02 +01:00
maccess.c	[S390] kernel: Use local_irq_save() for memcpy_real()	2012-04-11 14:28:24 +02:00
Makefile
mmap.c
page-states.c
pageattr.c
pgtable.c	[S390] fix tlb flushing for page table pages	2012-04-11 14:28:24 +02:00
vmem.c