kernel/git/stable/linux-stable.git/arch/parisc, branch linux-4.16.y

parisc: Move setup_profiling_timer() out of init section

2018-06-20T19:01:46+00:00

[ Upstream commit 01f56832cfb6fcc204e7203f46841b6185ebd574 ] No other architecture has setup_profiling_timer() in the init section, thus on parisc we face this section mismatch warning: Reference from the function devm_device_add_group() to the function .init.text:setup_profiling_timer() Signed-off-by: Helge Deller Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman

parisc: drivers.c: Fix section mismatches

2018-06-20T19:01:33+00:00

[ Upstream commit b819439fea305a0bfd6ca23a7994fd1a8847c0d8 ] Fix two section mismatches in drivers.c: 1) Section mismatch in reference from the function alloc_tree_node() to the function .init.text:create_tree_node(). 2) Section mismatch in reference from the function walk_native_bus() to the function .init.text:alloc_pa_dev(). Signed-off-by: Helge Deller Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman

parisc: time: Convert read_persistent_clock() to read_persistent_clock64()

2018-06-20T19:01:21+00:00

[ Upstream commit f76cdd00ef0e39d880139b074e3b247594dff95a ] The read_persistent_clock() uses a timespec, which is not year 2038 safe on 32bit systems. On parisc architecture, we have implemented generic RTC drivers that can be used to compensate the system suspend time, but the RTC time can not represent the nanosecond resolution, so this patch just converts to read_persistent_clock64() with timespec64. Signed-off-by: Baolin Wang Acked-by: Arnd Bergmann Signed-off-by: Helge Deller Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman

parisc: Fix HPMC handler by increasing size to multiple of 16 bytes

2018-04-19T06:54:06+00:00

commit d5654e156bc4d68a87bbaa6d7e020baceddf6e68 upstream. Make sure that the HPMC (High Priority Machine Check) handler is 16-byte aligned and that it's length in the IVT is a multiple of 16 bytes. Otherwise PDC may decide not to call the HPMC crash handler. Signed-off-by: Helge Deller Cc: stable@vger.kernel.org Signed-off-by: Greg Kroah-Hartman

parisc: Fix out of array access in match_pci_device()

2018-04-19T06:54:06+00:00

commit 615b2665fd20c327b631ff1e79426775de748094 upstream. As found by the ubsan checker, the value of the 'index' variable can be out of range for the bc[] array: UBSAN: Undefined behaviour in arch/parisc/kernel/drivers.c:655:21 index 6 is out of range for type 'char [6]' Backtrace: [<104fa850>] __ubsan_handle_out_of_bounds+0x68/0x80 [<1019d83c>] check_parent+0xc0/0x170 [<1019d91c>] descend_children+0x30/0x6c [<1059e164>] device_for_each_child+0x60/0x98 [<1019cd54>] parse_tree_node+0x40/0x54 [<1019d86c>] check_parent+0xf0/0x170 [<1019d91c>] descend_children+0x30/0x6c [<1059e164>] device_for_each_child+0x60/0x98 [<1019d938>] descend_children+0x4c/0x6c [<1059e164>] device_for_each_child+0x60/0x98 [<1019cd54>] parse_tree_node+0x40/0x54 [<1019cffc>] hwpath_to_device+0xa4/0xc4 Signed-off-by: Helge Deller Cc: stable@vger.kernel.org Signed-off-by: Greg Kroah-Hartman

parisc: Handle case where flush_cache_range is called with no context

2018-03-17T10:49:39+00:00

Just when I had decided that flush_cache_range() was always called with a valid context, Helge reported two cases where the "BUG_ON(!vma->vm_mm->context);" was hit on the phantom buildd: kernel BUG at /mnt/sdb6/linux/linux-4.15.4/arch/parisc/kernel/cache.c:587! CPU: 1 PID: 3254 Comm: kworker/1:2 Tainted: G D 4.15.0-1-parisc64-smp #1 Debian 4.15.4-1+b1 Workqueue: events free_ioctx IAOQ[0]: flush_cache_range+0x164/0x168 IAOQ[1]: flush_cache_page+0x0/0x1c8 RP(r2): unmap_page_range+0xae8/0xb88 Backtrace: [<00000000404a6980>] unmap_page_range+0xae8/0xb88 [<00000000404a6ae0>] unmap_single_vma+0xc0/0x188 [<00000000404a6cdc>] zap_page_range_single+0x134/0x1f8 [<00000000404a702c>] unmap_mapping_range+0x1cc/0x208 [<0000000040461518>] truncate_pagecache+0x98/0x108 [<0000000040461624>] truncate_setsize+0x9c/0xb8 [<00000000405d7f30>] put_aio_ring_file+0x80/0x100 [<00000000405d803c>] aio_free_ring+0x8c/0x290 [<00000000405d82c0>] free_ioctx+0x80/0x180 [<0000000040284e6c>] process_one_work+0x21c/0x668 [<00000000402854c4>] worker_thread+0x20c/0x778 [<0000000040291d44>] kthread+0x2d4/0x2e0 [<0000000040204020>] end_fault_vector+0x20/0xc0 This indicates that we need to handle the no context case in flush_cache_range() as we do in flush_cache_mm(). In thinking about this, I realized that we don't need to flush the TLB when there is no context. So, I added context checks to the large flush cases in flush_cache_mm() and flush_cache_range(). The large flush case occurs frequently in flush_cache_mm() and the change should improve fork performance. The v2 version of this change removes the BUG_ON from flush_cache_page() by skipping the TLB flush when there is no context. I also added code to flush the TLB in flush_cache_mm() and flush_cache_range() when we have a context that's not current. Now all three routines handle TLB flushes in a similar manner. Signed-off-by: John David Anglin Cc: stable@vger.kernel.org # 4.9+ Signed-off-by: Helge Deller

Merge branch 'parisc-4.16-1' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux

2018-03-02T21:05:20+00:00

Pull parisc fixes from Helge Deller: - a patch to change the ordering of cache and TLB flushes to hopefully fix the random segfaults we very rarely face (by Dave Anglin). - a patch to hide the virtual kernel memory layout due to security reasons. - two small patches to make the kernel run more smoothly under qemu. * 'parisc-4.16-1' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux: parisc: Reduce irq overhead when run in qemu parisc: Use cr16 interval timers unconditionally on qemu parisc: Check if secondary CPUs want own PDC calls parisc: Hide virtual kernel memory layout parisc: Fix ordering of cache and TLB flushes

parisc: Reduce irq overhead when run in qemu

2018-03-02T09:05:07+00:00

When run under QEMU, calling mfctl(16) creates some overhead because the qemu timer has to be scaled and moved into the register. This patch reduces the number of calls to mfctl(16) by moving the calls out of the loops. Additionally, increase the minimal time interval to 8000 cycles instead of 500 to compensate possible QEMU delays when delivering interrupts. Signed-off-by: Helge Deller Cc: stable@vger.kernel.org # 4.14+

parisc: Use cr16 interval timers unconditionally on qemu

2018-03-02T09:04:59+00:00

When running on qemu we know that the (emulated) cr16 cpu-internal clocks are syncronized. So let's use them unconditionally on qemu. Signed-off-by: Helge Deller Cc: stable@vger.kernel.org # 4.14+

parisc: Check if secondary CPUs want own PDC calls

2018-03-02T09:04:46+00:00

The architecture specification says (for 64-bit systems): PDC is a per processor resource, and operating system software must be prepared to manage separate pointers to PDCE_PROC for each processor. The address of PDCE_PROC for the monarch processor is stored in the Page Zero location MEM_PDC. The address of PDCE_PROC for each non-monarch processor is passed in gr26 when PDCE_RESET invokes OS_RENDEZ. Currently we still use one PDC for all CPUs, but in case we face a machine which is following the specification let's warn about it. Signed-off-by: Helge Deller