Martin Schwidefsky 53c4ab70c1 s390: fix alloc_pgste check in init_new_context again ... git commit badb8bb983 "fix alloc_pgste check in init_new_context" fixed the problem of 'current->mm == NULL' in init_new_context back in 2011. git commit 3eabaee998 "KVM: s390: allow sie enablement for multi- threaded programs" completely removed the check against alloc_pgste. git commit 23fefe119c "s390/kvm: avoid global config of vm.alloc_pgste=1" re-added a check against the alloc_pgste flag but without the required check for current->mm != NULL. For execve() called by a kernel thread init_new_context() reads from ((struct mm_struct *) NULL)->context.alloc_pgste to decide between 2K vs 4K page tables. If the bit happens to be set for the init process it will be created with large page tables. This decision is inherited by all the children of init, this waste quite some memory. Re-add the check for 'current->mm != NULL'. Fixes: 23fefe119c ("s390/kvm: avoid global config of vm.alloc_pgste=1") Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>		2017-11-24 11:02:42 +01:00
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asm	s390: fix alloc_pgste check in init_new_context again	2017-11-24 11:02:42 +01:00
uapi/asm	s390/perf: extend perf_regs support to include floating-point registers	2017-11-16 15:06:14 +01:00