pm24.git/mm/vmalloc.c, branch v3.2-rc3

xen: map foreign pages for shared rings by updating the PTEs directly

2011-11-16T17:13:08Z

When mapping a foreign page with xenbus_map_ring_valloc() with the GNTTABOP_map_grant_ref hypercall, set the GNTMAP_contains_pte flag and pass a pointer to the PTE (in init_mm). After the page is mapped, the usual fault mechanism can be used to update additional MMs. This allows the vmalloc_sync_all() to be removed from alloc_vm_area(). Signed-off-by: David Vrabel Acked-by: Andrew Morton [v1: Squashed fix by Michal for no-mmu case] Signed-off-by: Konrad Rzeszutek Wilk Signed-off-by: Michal Simek

mm/vmalloc.c: report more vmalloc failures

2011-11-01T00:30:48Z

Some vmalloc failure paths do not report OOM conditions. Add warn_alloc_failed, which also does a dump_stack, to those failure paths. This allows more site specific vmalloc failure logging message printks to be removed. Signed-off-by: Joe Perches Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

mm: neaten warn_alloc_failed

2011-11-01T00:30:48Z

Add __attribute__((format (printf...) to the function to validate format and arguments. Use vsprintf extension %pV to avoid any possible message interleaving. Coalesce format string. Convert printks/pr_warning to pr_warn. [akpm@linux-foundation.org: use the __printf() macro] Signed-off-by: Joe Perches Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

mm: avoid null pointer access in vm_struct via /proc/vmallocinfo

2011-11-01T00:30:47Z

The /proc/vmallocinfo shows information about vmalloc allocations in vmlist that is a linklist of vm_struct. It, however, may access pages field of vm_struct where a page was not allocated. This results in a null pointer access and leads to a kernel panic. Why this happens: In __vmalloc_node_range() called from vmalloc(), newly allocated vm_struct is added to vmlist at __get_vm_area_node() and then, some fields of vm_struct such as nr_pages and pages are set at __vmalloc_area_node(). In other words, it is added to vmlist before it is fully initialized. At the same time, when the /proc/vmallocinfo is read, it accesses the pages field of vm_struct according to the nr_pages field at show_numa_info(). Thus, a null pointer access happens. The patch adds the newly allocated vm_struct to the vmlist *after* it is fully initialized. So, it can avoid accessing the pages field with unallocated page when show_numa_info() is called. Signed-off-by: Mitsuo Hayasaka Cc: Andrew Morton Cc: David Rientjes Cc: Namhyung Kim Cc: "Paul E. McKenney" Cc: Jeremy Fitzhardinge Cc: Cc: Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

mm: sync vmalloc address space page tables in alloc_vm_area()

2011-09-15T01:09:38Z

Xen backend drivers (e.g., blkback and netback) would sometimes fail to map grant pages into the vmalloc address space allocated with alloc_vm_area(). The GNTTABOP_map_grant_ref would fail because Xen could not find the page (in the L2 table) containing the PTEs it needed to update. (XEN) mm.c:3846:d0 Could not find L1 PTE for address fbb42000 netback and blkback were making the hypercall from a kernel thread where task->active_mm != &init_mm and alloc_vm_area() was only updating the page tables for init_mm. The usual method of deferring the update to the page tables of other processes (i.e., after taking a fault) doesn't work as a fault cannot occur during the hypercall. This would work on some systems depending on what else was using vmalloc. Fix this by reverting ef691947d8a3 ("vmalloc: remove vmalloc_sync_all() from alloc_vm_area()") and add a comment to explain why it's needed. Signed-off-by: David Vrabel Cc: Jeremy Fitzhardinge Cc: Konrad Rzeszutek Wilk Cc: Ian Campbell Cc: Keir Fraser Cc: [3.0.x] Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

mm: fix wrong vmap address calculations with odd NR_CPUS values

2011-08-14T19:32:52Z

Commit db64fe02258f ("mm: rewrite vmap layer") introduced code that does address calculations under the assumption that VMAP_BLOCK_SIZE is a power of two. However, this might not be true if CONFIG_NR_CPUS is not set to a power of two. Wrong vmap_block index/offset values could lead to memory corruption. However, this has never been observed in practice (or never been diagnosed correctly); what caught this was the BUG_ON in vb_alloc() that checks for inconsistent vmap_block indices. To fix this, ensure that VMAP_BLOCK_SIZE always is a power of two. BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=31572 Reported-by: Pavel Kysilka Reported-by: Matias A. Fonzo Signed-off-by: Clemens Ladisch Signed-off-by: Stefan Richter Cc: Nick Piggin Cc: Jeremy Fitzhardinge Cc: Krzysztof Helt Cc: Andrew Morton Cc: 2.6.28+ Signed-off-by: Linus Torvalds

atomic: use

2011-07-26T23:49:47Z

This allows us to move duplicated code in (atomic_inc_not_zero() for now) to Signed-off-by: Arun Sharma Reviewed-by: Eric Dumazet Cc: Ingo Molnar Cc: David Miller Cc: Eric Dumazet Acked-by: Mike Frysinger Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

vmalloc,rcu: Convert call_rcu(rcu_free_vb) to kfree_rcu()

2011-07-20T21:10:18Z

The rcu callback rcu_free_vb() just calls a kfree(), so we use kfree_rcu() instead of the call_rcu(rcu_free_vb). Signed-off-by: Lai Jiangshan Signed-off-by: Paul E. McKenney Cc: Andrew Morton Cc: Namhyung Kim Cc: David Rientjes Reviewed-by: Josh Triplett

vmalloc,rcu: Convert call_rcu(rcu_free_va) to kfree_rcu()

2011-07-20T21:10:17Z

The rcu callback rcu_free_va() just calls a kfree(), so we use kfree_rcu() instead of the call_rcu(rcu_free_va). Signed-off-by: Lai Jiangshan Signed-off-by: Paul E. McKenney Cc: Andrew Morton Cc: Namhyung Kim Cc: David Rientjes Reviewed-by: Josh Triplett

Merge branch 'upstream/tidy-xen-mmu-2.6.39' of git://git.kernel.org/pub/scm/linux/kernel/git/jeremy/xen

2011-05-27T02:01:15Z

* 'upstream/tidy-xen-mmu-2.6.39' of git://git.kernel.org/pub/scm/linux/kernel/git/jeremy/xen: xen: fix compile without CONFIG_XEN_DEBUG_FS Use arbitrary_virt_to_machine() to deal with ioremapped pud updates. Use arbitrary_virt_to_machine() to deal with ioremapped pmd updates. xen/mmu: remove all ad-hoc stats stuff xen: use normal virt_to_machine for ptes xen: make a pile of mmu pvop functions static vmalloc: remove vmalloc_sync_all() from alloc_vm_area() xen: condense everything onto xen_set_pte xen: use mmu_update for xen_set_pte_at() xen: drop all the special iomap pte paths.