user/sven/linux.git/arch/arc/include, branch v3.18.32

ARC: add smp barriers around atomics per Documentation/atomic_ops.txt

2015-07-05T14:12:50Z

[ Upstream commit 2576c28e3f623ed401db7e6197241865328620ef ] - arch_spin_lock/unlock were lacking the ACQUIRE/RELEASE barriers Since ARCv2 only provides load/load, store/store and all/all, we need the full barrier - LLOCK/SCOND based atomics, bitops, cmpxchg, which return modified values were lacking the explicit smp barriers. - Non LLOCK/SCOND varaints don't need the explicit barriers since that is implicity provided by the spin locks used to implement the critical section (the spin lock barriers in turn are also fixed in this commit as explained above Cc: Paul E. McKenney Cc: stable@vger.kernel.org Acked-by: Peter Zijlstra (Intel) Signed-off-by: Vineet Gupta Signed-off-by: Sasha Levin

ARC: add compiler barrier to LLSC based cmpxchg

2015-07-05T14:12:50Z

[ Upstream commit d57f727264f1425a94689bafc7e99e502cb135b5 ] When auditing cmpxchg call sites, Chuck noted that gcc was optimizing away some of the desired LDs. | do { | new = old = *ipi_data_ptr; | new |= 1U << msg; | } while (cmpxchg(ipi_data_ptr, old, new) != old); was generating to below | 8015cef8: ld r2,[r4,0] <-- First LD | 8015cefc: bset r1,r2,r1 | | 8015cf00: llock r3,[r4] <-- atomic op | 8015cf04: brne r3,r2,8015cf10 | 8015cf08: scond r1,[r4] | 8015cf0c: bnz 8015cf00 | | 8015cf10: brne r3,r2,8015cf00 <-- Branch doesn't go to orig LD Although this was fixed by adding a ACCESS_ONCE in this call site, it seems safer (for now at least) to add compiler barrier to LLSC based cmpxchg Reported-by: Chuck Jordan Cc: Acked-by: Peter Zijlstra (Intel) Signed-off-by: Vineet Gupta Signed-off-by: Sasha Levin

ARC: unbork !LLSC build

2015-06-10T17:42:46Z

[ Upstream commit daaf40e53b5dbdf75255d58a45ce8ac65ca511a8 ] Fixes: f7d11e93ee97a locking,arch,arc: Fold atomic_ops Cc: # 3.18 Signed-off-by: Vineet Gupta Signed-off-by: Sasha Levin

ARC: Fix KSTK_ESP()

2015-03-14T19:37:27Z

commit 13648b0118a24f4fc76c34e6c7b6ccf447e46a2a upstream. /proc//maps currently don't annotate stack vma with "[stack]" This is because KSTK_ESP ie expected to return usermode SP of tsk while currently it returns the kernel mode SP of a sleeping tsk. While the fix is trivial, we also need to adjust the ARC kernel stack unwinder to not use KSTK_SP and friends any more. Reported-and-suggested-by: Alexey Brodkin Signed-off-by: Vineet Gupta Signed-off-by: Sasha Levin

ARC: fix page address calculation if PAGE_OFFSET != LINUX_LINK_BASE

2015-03-06T22:53:01Z

commit 06f34e1c28f3608b0ce5b310e41102d3fe7b65a1 upstream. We used to calculate page address differently in 2 cases: 1. In virt_to_page(x) we do --->8--- mem_map + (x - CONFIG_LINUX_LINK_BASE) >> PAGE_SHIFT --->8--- 2. In in pte_page(x) we do --->8--- mem_map + (pte_val(x) - PAGE_OFFSET) >> PAGE_SHIFT --->8--- That leads to problems in case PAGE_OFFSET != CONFIG_LINUX_LINK_BASE - different pages will be selected depending on where and how we calculate page address. In particular in the STAR 9000853582 when gdb attempted to read memory of another process it got improper page in get_user_pages() because this is exactly one of the places where we search for a page by pte_page(). The fix is trivial - we need to calculate page address similarly in both cases. Signed-off-by: Alexey Brodkin Signed-off-by: Vineet Gupta Signed-off-by: Greg Kroah-Hartman

Merge tag 'arc-3.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc

2014-10-21T14:50:02Z

Pull ARC updates from Vineet Gupta: "Sorry for the late pull request. Current stuff was ready for a while but I was hoping to squeeze in support for almost ready ARC SDP platform (and avoid a 2nd pull request), however it seems there are still some loose ends which warrant more time. - Platform code reduction/moving-up (TB10X no longer needs any callbacks) - updated boot printing - kgdb update for arc gdb 7.5 - bug fixes (some marked for stable) - more code refactoring/consolidation" * tag 'arc-3.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc: ARC: boot: cpu feature print enhancements ARC: boot: consolidate cross-checking of h/w and s/w ARC: unbork FPU save/restore ARC: remove extraneous __KERNEL__ guards ARC: Update order of registers in KGDB to match GDB 7.5 ARC: Remove unneeded Kconfig entry NO_DMA ARC: BUG() dumps stack after @msg (@msg now same as in generic BUG)) ARC: refactoring: reduce the scope of some local vars ARC: remove gcc mpy heuristics ARC: RIP @running_on_hw ARC: Update comments about uncached address space ARC: rename kconfig option for unaligned emulation ARC: [nsimosci] Allow "headless" models to boot ARC: [arcfpga] Get rid of ARC_BOARD_ANGEL4 and ARC_BOARD_ML509 ARC: [arcfpga] Remove more dead code ARC: [plat*] move code out of .init_machine into common ARC: [arcfpga] consolidate machine description, DT ARC: Allow SMP kernel to build/boot on UP-only infrastructure

Merge branch 'locking-arch-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2014-10-13T13:48:00Z

Pull arch atomic cleanups from Ingo Molnar: "This is a series kept separate from the main locking tree, which cleans up and improves various details in the atomics type handling: - Remove the unused atomic_or_long() method - Consolidate and compress atomic ops implementations between architectures, to reduce linecount and to make it easier to add new ops. - Rewrite generic atomic support to only require cmpxchg() from an architecture - generate all other methods from that" * 'locking-arch-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (23 commits) locking,arch: Use ACCESS_ONCE() instead of cast to volatile in atomic_read() locking, mips: Fix atomics locking, sparc64: Fix atomics locking,arch: Rewrite generic atomic support locking,arch,xtensa: Fold atomic_ops locking,arch,sparc: Fold atomic_ops locking,arch,sh: Fold atomic_ops locking,arch,powerpc: Fold atomic_ops locking,arch,parisc: Fold atomic_ops locking,arch,mn10300: Fold atomic_ops locking,arch,mips: Fold atomic_ops locking,arch,metag: Fold atomic_ops locking,arch,m68k: Fold atomic_ops locking,arch,m32r: Fold atomic_ops locking,arch,ia64: Fold atomic_ops locking,arch,hexagon: Fold atomic_ops locking,arch,cris: Fold atomic_ops locking,arch,avr32: Fold atomic_ops locking,arch,arm64: Fold atomic_ops locking,arch,arm: Fold atomic_ops ...

ARC: boot: cpu feature print enhancements

2014-10-13T09:16:22Z

Signed-off-by: Vineet Gupta

ARC: unbork FPU save/restore

2014-10-13T09:16:21Z

Fixes: 2ab402dfd65d15a4b2 "ARC: make start_thread() out-of-line" CC: #3.16 Signed-off-by: Vineet Gupta

ARC: remove extraneous KERNEL guards

2014-10-13T09:16:20Z

Verified by doing make headers_install as none of these files are exported to userspace