]> git.karo-electronics.de Git - karo-tx-linux.git/commit
thp: make MADV_HUGEPAGE check for mm->def_flags
authorGerald Schaefer <gerald.schaefer@de.ibm.com>
Fri, 28 Sep 2012 00:19:21 +0000 (10:19 +1000)
committerStephen Rothwell <sfr@canb.auug.org.au>
Fri, 28 Sep 2012 06:07:36 +0000 (16:07 +1000)
commitccb1a802da0551ab1fd9befdcf758378d440e472
treeee8588711b32fba8f633704a9534a8190cded6be
parent2290d23c9763020785e29fa2c0b2bb70da5ae3fe
thp: make MADV_HUGEPAGE check for mm->def_flags

This adds a check to hugepage_madvise(), to refuse MADV_HUGEPAGE if
VM_NOHUGEPAGE is set in mm->def_flags.  On s390, the VM_NOHUGEPAGE flag
will be set in mm->def_flags for kvm processes, to prevent any future thp
mappings.  In order to also prevent MADV_HUGEPAGE on such an mm,
hugepage_madvise() should check mm->def_flags.

Signed-off-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Hillf Danton <dhillf@gmail.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
mm/huge_memory.c