kernel.git/arch/arm/mm/flush.c, branch linux-3.2.y

ARM: 7755/1: handle user space mapped pages in flush_kernel_dcache_page

2013-06-29T03:06:28Z

commit 1bc39742aab09248169ef9d3727c9def3528b3f3 upstream. Commit f8b63c1 made flush_kernel_dcache_page a no-op assuming that the pages it needs to handle are kernel mapped only. However, for example when doing direct I/O, pages with user space mappings may occur. Thus, continue to do lazy flushing if there are no user space mappings. Otherwise, flush the kernel cache lines directly. Signed-off-by: Simon Baatz Reviewed-by: Catalin Marinas Signed-off-by: Russell King Signed-off-by: Ben Hutchings

ARM: 7487/1: mm: avoid setting nG bit for user mappings that aren't present

2012-09-19T14:05:01Z

commit 47f1204329237a0f8655f5a9f14a38ac81946ca1 upstream. Swap entries are encoding in ptes such that !pte_present(pte) and pte_file(pte). The remaining bits of the descriptor are used to identify the swapfile and offset within it to the swap entry. When writing such a pte for a user virtual address, set_pte_at unconditionally sets the nG bit, which (in the case of LPAE) will corrupt the swapfile offset and lead to a BUG: [ 140.494067] swap_free: Unused swap offset entry 000763b4 [ 140.509989] BUG: Bad page map in process rs:main Q:Reg pte:0ec76800 pmd:8f92e003 This patch fixes the problem by only setting the nG bit for user mappings that are actually present. Reviewed-by: Catalin Marinas Signed-off-by: Will Deacon Signed-off-by: Russell King Signed-off-by: Ben Hutchings

Merge branches 'consolidate', 'ep93xx', 'fixes', 'misc', 'mmci', 'remove' and 'spear' into for-linus

2011-05-23T18:27:40Z

ARM: 6899/1: fix the note about dcache lazy flushing for SMP systems

2011-05-20T21:39:17Z

Acked-by: Catalin Marinas Signed-off-by: Saeed Bishara Signed-off-by: Russell King

ARM: 6901/1: remove unneeded check of the cache_is_vipt_nonaliasing()

2011-05-16T14:42:42Z

when cache_is_vipt_nonaliasing(), we always have pte_exec() true at the end of this function, so no need for the additional check. Acked-by: Catalin Marinas Signed-off-by: Saeed Bishara Signed-off-by: Russell King

Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial

2011-01-13T18:05:56Z

* 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial: (43 commits) Documentation/trace/events.txt: Remove obsolete sched_signal_send. writeback: fix global_dirty_limits comment runtime -> real-time ppc: fix comment typo singal -> signal drivers: fix comment typo diable -> disable. m68k: fix comment typo diable -> disable. wireless: comment typo fix diable -> disable. media: comment typo fix diable -> disable. remove doc for obsolete dynamic-printk kernel-parameter remove extraneous 'is' from Documentation/iostats.txt Fix spelling milisec -> ms in snd_ps3 module parameter description Fix spelling mistakes in comments Revert conflicting V4L changes i7core_edac: fix typos in comments mm/rmap.c: fix comment sound, ca0106: Fix assignment to 'channel'. hrtimer: fix a typo in comment init/Kconfig: fix typo anon_inodes: fix wrong function name in comment fix comment typos concerning "consistent" poll: fix a typo in comment ... Fix up trivial conflicts in: - drivers/net/wireless/iwlwifi/iwl-core.c (moved to iwl-legacy.c) - fs/ext4/ext4.h Also fix missed 'diabled' typo in drivers/net/bnx2x/bnx2x.h while at it.

ARM: get rid of kmap_high_l1_vipt()

2010-12-19T17:56:46Z

Since commit 3e4d3af501 "mm: stack based kmap_atomic()", it is no longer necessary to carry an ad hoc version of kmap_atomic() added in commit 7e5a69e83b "ARM: 6007/1: fix highmem with VIPT cache and DMA" to cope with reentrancy. In fact, it is now actively wrong to rely on fixed kmap type indices (namely KM_L1_CACHE) as kmap_atomic() totally ignores them now and a concurrent instance of it may reuse any slot for any purpose. Signed-off-by: Nicolas Pitre

ARM, mm: Don't include smp_plat.h twice in flush.c

2010-11-15T13:27:11Z

It's enough to include the asm/smp_plat.h once in arch/arm/mm/flush.c Signed-off-by: Jesper Juhl Signed-off-by: Jiri Kosina

ARM: 6386/1: flush_ptrace_access: invalidate correct I-cache alias

2010-10-04T19:57:10Z

copy_to_user_page can be used by access_process_vm to write to an executable page of a process using a mapping acquired by kmap. For systems with I-cache aliasing, flushing the I-cache using the Kernel mapping may leave stale data in the I-cache if the user mapping is of a different colour. This patch introduces a flush_icache_alias function to flush.c, which calls flush_icache_range with a mapping of the specified colour. flush_ptrace_access is then modified to call this new function instead of coherent_kern_range in the case of an aliasing I-cache and a non-aliasing D-cache. Signed-off-by: Will Deacon Signed-off-by: Russell King

ARM: 6381/1: Use lazy cache flushing on ARMv7 SMP systems

2010-09-19T11:17:45Z

ARMv7 processors like Cortex-A9 broadcast the cache maintenance operations in hardware. This patch allows the flush_dcache_page/update_mmu_cache pair to work in lazy flushing mode similar to the UP case. Note that cache flushing on SMP systems now takes place via the set_pte_at() call (__sync_icache_dcache) and there is no race with other CPUs executing code from the new PTE before the cache flushing took place. Tested-by: Rabin Vincent Cc: Nicolas Pitre Signed-off-by: Catalin Marinas Signed-off-by: Russell King