kernel.git/arch/x86/kernel, branch linux-3.11.y

sched, idle: Fix the idle polling state logic

2013-11-29T18:42:15Z

commit ea8117478918a4734586d35ff530721b682425be upstream. Mike reported that commit 7d1a9417 ("x86: Use generic idle loop") regressed several workloads and caused excessive reschedule interrupts. The patch in question failed to notice that the x86 code had an inverted sense of the polling state versus the new generic code (x86: default polling, generic: default !polling). Fix the two prominent x86 mwait based idle drivers and introduce a few new generic polling helpers (fixing the wrong smp_mb__after_clear_bit usage). Also switch the idle routines to using tif_need_resched() which is an immediate TIF_NEED_RESCHED test as opposed to need_resched which will end up being slightly different. Reported-by: Mike Galbraith Signed-off-by: Peter Zijlstra Cc: lenb@kernel.org Cc: tglx@linutronix.de Link: http://lkml.kernel.org/n/tip-nc03imb0etuefmzybzj7sprf@git.kernel.org Signed-off-by: Ingo Molnar Signed-off-by: Greg Kroah-Hartman

x86: Update UV3 hub revision ID

2013-11-13T03:08:06Z

commit dd3c9c4b603c664fedc12facf180db0f1794aafe upstream. The UV3 hub revision ID is different than expected. The first revision was supposed to start at 1 but instead will start at 0. Signed-off-by: Russ Anderson Link: http://lkml.kernel.org/r/20131014161733.GA6274@sgi.com Signed-off-by: Ingo Molnar Signed-off-by: Greg Kroah-Hartman

x86: avoid remapping data in parse_setup_data()

2013-10-18T17:55:02Z

commit 30e46b574a1db7d14404e52dca8e1aa5f5155fd2 upstream. Type SETUP_PCI, added by setup_efi_pci(), may advertise a ROM size larger than early_memremap() is able to handle, which is currently limited to 256kB. If this occurs it leads to a NULL dereference in parse_setup_data(). To avoid this, remap the setup_data header and allow parsing functions for individual types to handle their own data remapping. Signed-off-by: Linn Crosetto Link: http://lkml.kernel.org/r/1376430401-67445-1-git-send-email-linn@hp.com Acked-by: Yinghai Lu Reviewed-by: Pekka Enberg Signed-off-by: H. Peter Anvin Cc: Paul Gortmaker Signed-off-by: Greg Kroah-Hartman

x86/reboot: Add quirk to make Dell C6100 use reboot=pci automatically

2013-10-05T14:17:55Z

commit 4f0acd31c31f03ba42494c8baf6c0465150e2621 upstream. Dell PowerEdge C6100 machines fail to completely reboot about 20% of the time. Signed-off-by: Masoud Sharbiani Signed-off-by: Vinson Lee Cc: Robin Holt Cc: Russell King Cc: Guan Xuetao Link: http://lkml.kernel.org/r/1379717947-18042-1-git-send-email-vlee@freedesktop.org Signed-off-by: Ingo Molnar Signed-off-by: Greg Kroah-Hartman

x86, amd_nb: Clarify F15h, model 30h GART and L3 support

2013-09-27T00:21:43Z

commit 7d64ac6422092adbbdaa279ab32f9d4c90a84558 upstream. F15h, models 0x30 and later don't have a GART. Note that. Also check CPUID leaf 0x80000006 for L3 prescence because there are models which don't sport an L3 cache. Signed-off-by: Aravind Gopalakrishnan [ Boris: rewrite commit message, cleanup comments. ] Signed-off-by: Borislav Petkov Signed-off-by: Greg Kroah-Hartman

Introduce [compat_]save_altstack_ex() to unbreak x86 SMAP

2013-09-27T00:21:43Z

commit bd1c149aa9915b9abb6d83d0f01dfd2ace0680b5 upstream. For performance reasons, when SMAP is in use, SMAP is left open for an entire put_user_try { ... } put_user_catch(); block, however, calling __put_user() in the middle of that block will close SMAP as the STAC..CLAC constructs intentionally do not nest. Furthermore, using __put_user() rather than put_user_ex() here is bad for performance. Thus, introduce new [compat_]save_altstack_ex() helpers that replace __[compat_]save_altstack() for x86, being currently the only architecture which supports put_user_try { ... } put_user_catch(). Reported-by: H. Peter Anvin Signed-off-by: Al Viro Signed-off-by: H. Peter Anvin Link: http://lkml.kernel.org/n/tip-es5p6y64if71k8p5u08agv9n@git.kernel.org Signed-off-by: Greg Kroah-Hartman

x86 get_unmapped_area: Access mmap_legacy_base through mm_struct member

2013-08-22T17:19:35Z

This is the updated version of df54d6fa5427 ("x86 get_unmapped_area(): use proper mmap base for bottom-up direction") that only randomizes the mmap base address once. Signed-off-by: Radu Caragea Reported-and-tested-by: Jeff Shorey Cc: Andrew Morton Cc: Michel Lespinasse Cc: Oleg Nesterov Cc: Rik van Riel Cc: Ingo Molnar Cc: Adrian Sendroiu Cc: Greg KH Cc: Kamal Mostafa Signed-off-by: Linus Torvalds

Revert "x86 get_unmapped_area(): use proper mmap base for bottom-up direction"

2013-08-22T17:18:44Z

This reverts commit df54d6fa54275ce59660453e29d1228c2b45a826. The commit isn't necessarily wrong, but because it recalculates the random mmap_base every time, it seems to confuse user memory allocators that expect contiguous mmap allocations even when the mmap address isn't specified. In particular, the MATLAB Java runtime seems to be unhappy. See https://bugzilla.kernel.org/show_bug.cgi?id=60774 So we'll want to apply the random offset only once, and Radu has a patch for that. Revert this older commit in order to apply the other one. Reported-by: Jeff Shorey Cc: Radu Caragea Cc: Andrew Morton Signed-off-by: Linus Torvalds

Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2013-08-19T16:18:29Z

Pull x86 fixes from Ingo Molnar: "Two AMD microcode loader fixes and an OLPC firmware support fix" * 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86, microcode, AMD: Fix early microcode loading x86, microcode, AMD: Make cpu_has_amd_erratum() use the correct struct cpuinfo_x86 x86: Don't clear olpc_ofw_header when sentinel is detected

Merge branch 'akpm' (patches from Andrew Morton)

2013-08-14T17:04:43Z

Merge a bunch of fixes from Andrew Morton. * emailed patches from Andrew Morton : fs/proc/task_mmu.c: fix buffer overflow in add_page_map() arch: *: Kconfig: add "kernel/Kconfig.freezer" to "arch/*/Kconfig" ocfs2: fix null pointer dereference in ocfs2_dir_foreach_blk_id() x86 get_unmapped_area(): use proper mmap base for bottom-up direction ocfs2: fix NULL pointer dereference in ocfs2_duplicate_clusters_by_page ocfs2: Revert 40bd62e to avoid regression in extended allocation drivers/rtc/rtc-stmp3xxx.c: provide timeout for potentially endless loop polling a HW bit hugetlb: fix lockdep splat caused by pmd sharing aoe: adjust ref of head for compound page tails microblaze: fix clone syscall mm: save soft-dirty bits on file pages mm: save soft-dirty bits on swapped pages memcg: don't initialize kmem-cache destroying work for root caches