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cfe79c00a2
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Mike Frysinger cfe79c00a2 NOMMU: Avoiding duplicate icache flushes of shared maps 
When working with FDPIC, there are many shared mappings of read-only
code regions between applications (the C library, applet packages like
busybox, etc.), but the current do_mmap_pgoff() function will issue an
icache flush whenever a VMA is added to an MM instead of only doing it
when the map is initially created.

The flush can instead be done when a region is first mmapped PROT_EXEC.
Note that we may not rely on the first mapping of a region being
executable - it's possible for it to be PROT_READ only, so we have to
remember whether we've flushed the region or not, and then flush the
entire region when a bit of it is made executable.

However, this also affects the brk area.  That will no longer be
executable.  We can mprotect() it to PROT_EXEC on MPU-mode kernels, but
for NOMMU mode kernels, when it increases the brk allocation, making
sys_brk() flush the extra from the icache should suffice.  The brk area
probably isn't used by NOMMU programs since the brk area can only use up
the leavings from the stack allocation, where the stack allocation is
larger than requested.

Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-01-06 18:16:02 -08:00
..
backing-dev.c flusher: Fix PF_FROZEN race 2009-12-03 13:49:43 +01:00
bootmem.c mm/bootmem.c: properly __init-annotate helper functions 2009-12-15 08:53:20 -08:00
bounce.c block: remove some includings of blktrace_api.h 2009-06-16 11:19:36 +02:00
debug-pagealloc.c generic debug pagealloc 2009-04-01 08:59:13 -07:00
dmapool.c dmapools: protect page_list walk in show_pools() 2009-06-30 18:56:00 -07:00
fadvise.c readahead: move max_sane_readahead() calls into force_page_cache_readahead() 2009-06-16 19:47:28 -07:00
failslab.c kmemtrace, mm: fix slab.h dependency problem in mm/failslab.c 2009-04-03 12:23:01 +02:00
filemap_xip.c const: mark struct vm_struct_operations 2009-09-27 11:39:25 -07:00
filemap.c direct I/O fallback sync simplification 2009-12-16 12:16:50 -05:00
fremap.c Do not account for the address space used by hugetlbfs using VM_ACCOUNT 2009-02-10 10:48:42 -08:00
highmem.c highmem: Fix debug_kmap_atomic() to also handle KM_IRQ_PTE, KM_NMI, and KM_NMI_PTE 2009-11-10 04:15:47 +01:00
hugetlb.c hugetlb: abort a hugepage pool resize if a signal is pending 2009-12-15 08:53:24 -08:00
hwpoison-inject.c HWPOISON: Don't do early filtering if filter is disabled 2009-12-16 12:20:01 +01:00
init-mm.c mm: consolidate init_mm definition 2009-06-16 19:47:28 -07:00
internal.h HWPOISON: add an interface to switch off/on all the page filters 2009-12-16 12:19:59 +01:00
Kconfig HWPOISON: Add PROC_FS dependency to hwpoison injector v2 2009-12-21 19:56:42 +01:00
Kconfig.debug trivial: improve help text for mm debug config options 2009-09-21 15:14:57 +02:00
kmemcheck.c kmemcheck: add hooks for the page allocator 2009-06-15 15:48:33 +02:00
kmemleak-test.c percpu: clean up percpu variable definitions 2009-06-24 15:13:48 +09:00
kmemleak.c Merge branch 'kmemleak' of git://linux-arm.org/linux-2.6 2009-12-17 16:00:19 -08:00
ksm.c ksm: remove unswappable max_kernel_pages 2009-12-15 08:53:20 -08:00
maccess.c [S390] maccess: add weak attribute to probe_kernel_write 2009-06-12 10:27:37 +02:00
madvise.c HWPOISON: Add a madvise() injector for soft page offlining 2009-12-16 12:20:00 +01:00
Makefile make generic_acl slightly more generic 2009-12-16 12:16:49 -05:00
memcontrol.c Merge branch 'hwpoison' of git://git.kernel.org/pub/scm/linux/kernel/git/ak/linux-mce-2.6 2009-12-16 12:36:49 -08:00
memory_hotplug.c mm: fix section mismatch in memory_hotplug.c 2009-12-15 08:53:20 -08:00
memory-failure.c HWPOISON: Add PROC_FS dependency to hwpoison injector v2 2009-12-21 19:56:42 +01:00
memory.c Merge branch 'hwpoison' of git://git.kernel.org/pub/scm/linux/kernel/git/ak/linux-mce-2.6 2009-12-16 12:36:49 -08:00
mempolicy.c ksm: memory hotremove migration only 2009-12-15 08:53:20 -08:00
mempool.c mm: remove broken 'kzalloc' mempool 2009-09-22 07:17:35 -07:00
migrate.c mm: remove unevictable_migrate_page function 2009-12-15 08:53:23 -08:00
mincore.c mm: hugetlb: fix hugepage memory leak in mincore() 2009-12-15 08:53:24 -08:00
mlock.c mlock: replace stale comments in munlock_vma_page() 2009-12-15 08:53:23 -08:00
mm_init.c mm: mminit_loglevel cannot be __meminitdata anymore 2008-08-20 15:40:30 -07:00
mmap.c mm: move sys_mmap_pgoff from util.c 2009-12-30 12:23:27 -08:00
mmu_context.c mm: reduce atomic use on use_mm fast path 2009-09-22 07:17:42 -07:00
mmu_notifier.c ksm: add mmu_notifier set_pte_at_notify() 2009-09-22 07:17:31 -07:00
mmzone.c [ARM] Double check memmap is actually valid with a memmap has unexpected holes V2 2009-05-18 11:22:24 +01:00
mprotect.c perf: Do the big rename: Performance Counters -> Performance Events 2009-09-21 14:28:04 +02:00
mremap.c Take arch_mmap_check() into get_unmapped_area() 2009-12-11 06:44:58 -05:00
msync.c [CVE-2009-0029] System call wrappers part 13 2009-01-14 14:15:23 +01:00
nommu.c NOMMU: Avoiding duplicate icache flushes of shared maps 2010-01-06 18:16:02 -08:00
oom_kill.c memcg: avoid oom-killing innocent task in case of use_hierarchy 2009-12-16 07:20:07 -08:00
page_alloc.c SYSCTL: Add a mutex to the page_alloc zone order sysctl 2009-12-23 21:01:16 +01:00
page_cgroup.c memory hotplug: alloc page from other node in memory online 2009-09-22 07:17:26 -07:00
page_io.c swap: rework map_swap_page() again 2009-12-15 08:53:16 -08:00
page_isolation.c memory hotplug: fix page_zone() calculation in test_pages_isolated() 2008-11-06 15:41:19 -08:00
page-writeback.c writeback: remove unused nonblocking and congestion checks 2009-12-03 13:54:25 +01:00
pagewalk.c mm hugetlb: add hugepage support to pagemap 2009-12-15 08:53:24 -08:00
percpu.c Merge branch 'for-linus' into for-next 2009-12-08 10:02:12 +09:00
prio_tree.c
quicklist.c cpumask: use new-style cpumask ops in mm/quicklist. 2009-09-24 09:34:52 +09:30
readahead.c readahead: add blk_run_backing_dev 2009-12-17 15:45:32 -08:00
rmap.c memcg: make memcg's file mapped consistent with global VM 2009-12-16 07:20:07 -08:00
shmem.c Fix breakage in shmem.c 2009-12-16 19:48:48 -05:00
slab.c SLAB: Fix lockdep annotation breakage 2009-12-28 20:57:27 +02:00
slob.c slab: remove duplicate kmem_cache_init_late() declarations 2009-08-06 11:36:25 +03:00
slub.c Merge branch 'perf-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2009-12-14 10:13:22 -08:00
sparse-vmemmap.c memory hotplug: alloc page from other node in memory online 2009-09-22 07:17:26 -07:00
sparse.c memory hotplug: alloc page from other node in memory online 2009-09-22 07:17:26 -07:00
swap_state.c mm: add_to_swap_cache() does not return -EEXIST 2009-09-22 07:17:35 -07:00
swap.c mm: replace various uses of num_physpages by totalram_pages 2009-09-22 07:17:38 -07:00
swapfile.c ksm: let shared pages be swappable 2009-12-15 08:53:19 -08:00
thrash.c mm: pass mm to grab_swap_token 2009-06-23 12:50:05 -07:00
truncate.c memcg: coalesce uncharge during unmap/truncate 2009-12-16 07:20:07 -08:00
util.c mm: move sys_mmap_pgoff from util.c 2009-12-30 12:23:27 -08:00
vmalloc.c vmalloc(): adjust gfp mask passed on nested vmalloc() invocation 2009-12-15 08:53:13 -08:00
vmscan.c vmscan: simplify code 2009-12-15 08:53:21 -08:00
vmstat.c vmscan: stop kswapd waiting on congestion when the min watermark is not being met 2009-12-15 08:53:16 -08:00