lwn.git/arch, branch v5.0-rc5

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

2019-02-03T17:08:12+00:00

Pull x86 fixes from Thomas Gleixner: "A few updates for x86: - Fix an unintended sign extension issue in the fault handling code - Rename the new resource control config switch so it's less confusing - Avoid setting up EFI info in kexec when the EFI runtime is disabled. - Fix the microcode version check in the AMD microcode loader so it only loads higher version numbers and never downgrades - Set EFER.LME in the 32bit trampoline before returning to long mode to handle older AMD/KVM behaviour properly. - Add Darren and Andy as x86/platform reviewers" * 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86/resctrl: Avoid confusion over the new X86_RESCTRL config x86/kexec: Don't setup EFI info if EFI runtime is not enabled x86/microcode/amd: Don't falsely trick the late loading mechanism MAINTAINERS: Add Andy and Darren as arch/x86/platform/ reviewers x86/fault: Fix sign-extend unintended sign extension x86/boot/compressed/64: Set EFER.LME=1 in 32-bit trampoline before returning to long mode x86/cpu: Add Atom Tremont (Jacobsville)

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

2019-02-03T17:02:03+00:00

Pull cpu hotplug fixes from Thomas Gleixner: "Two fixes for the cpu hotplug machinery: - Replace the overly clever 'SMT disabled by BIOS' detection logic as it breaks KVM scenarios and prevents speculation control updates when the Hyperthreads are brought online late after boot. - Remove a redundant invocation of the speculation control update function" * 'smp-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: cpu/hotplug: Fix "SMT disabled by BIOS" detection for KVM x86/speculation: Remove redundant arch_smt_update() invocation

Merge tag 'riscv-for-linus-5.0-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/palmer/riscv-linux

2019-02-02T18:26:14+00:00

Pull RISC-V fixes from Palmer Dabbelt: "This contains a handful of mostly-independent patches: - make our port respect TIF_NEED_RESCHED, which fixes CONFIG_PREEMPT=y kernels - fix double-put of OF nodes - fix a misspelling of target in our Kconfig - generic PCIe is enabled in our defconfig - fix our SBI early console to properly handle line endings - fix max_low_pfn being counted in PFNs - a change to TASK_UNMAPPED_BASE to match what other arches do This has passed my standard 'boot Fedora' flow" * tag 'riscv-for-linus-5.0-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/palmer/riscv-linux: riscv: Adjust mmap base address at a third of task size riscv: fixup max_low_pfn with PFN_DOWN. tty/serial: use uart_console_write in the RISC-V SBL early console RISC-V: defconfig: Add CRYPTO_DEV_VIRTIO=y RISC-V: defconfig: Enable Generic PCIE by default RISC-V: defconfig: Move CONFIG_PCI{,E_XILINX} RISC-V: Kconfig: fix spelling mistake "traget" -> "target" RISC-V: asm/page.h: fix spelling mistake "CONFIG_64BITS" -> "CONFIG_64BIT" RISC-V: fix bad use of of_node_put RISC-V: Add _TIF_NEED_RESCHED check for kernel thread when CONFIG_PREEMPT=y

Merge branch 'akpm' (patches from Andrew)

2019-02-02T17:32:58+00:00

Merge misc fixes from Andrew Morton: "24 fixes" * emailed patches from Andrew Morton : (24 commits) autofs: fix error return in autofs_fill_super() autofs: drop dentry reference only when it is never used fs/drop_caches.c: avoid softlockups in drop_pagecache_sb() mm: migrate: don't rely on __PageMovable() of newpage after unlocking it psi: clarify the Kconfig text for the default-disable option mm, memory_hotplug: __offline_pages fix wrong locking mm: hwpoison: use do_send_sig_info() instead of force_sig() kasan: mark file common so ftrace doesn't trace it init/Kconfig: fix grammar by moving a closing parenthesis lib/test_kmod.c: potential double free in error handling mm, oom: fix use-after-free in oom_kill_process mm/hotplug: invalid PFNs from pfn_to_online_page() mm,memory_hotplug: fix scan_movable_pages() for gigantic hugepages psi: fix aggregation idle shut-off mm, memory_hotplug: test_pages_in_a_zone do not pass the end of zone mm, memory_hotplug: is_mem_section_removable do not pass the end of a zone oom, oom_reaper: do not enqueue same task twice mm: migrate: make buffer_migrate_page_norefs() actually succeed kernel/exit.c: release ptraced tasks before zap_pid_ns_processes x86_64: increase stack size for KASAN_EXTRA ...

x86/resctrl: Avoid confusion over the new X86_RESCTRL config

2019-02-02T09:34:52+00:00

"Resource Control" is a very broad term for this CPU feature, and a term that is also associated with containers, cgroups etc. This can easily cause confusion. Make the user prompt more specific. Match the config symbol name. [ bp: In the future, the corresponding ARM arch-specific code will be under ARM_CPU_RESCTRL and the arch-agnostic bits will be carved out under the CPU_RESCTRL umbrella symbol. ] Signed-off-by: Johannes Weiner Signed-off-by: Borislav Petkov Cc: Babu Moger Cc: Fenghua Yu Cc: "H. Peter Anvin" Cc: Ingo Molnar Cc: James Morse Cc: Jonathan Corbet Cc: "Kirill A. Shutemov" Cc: linux-doc@vger.kernel.org Cc: Peter Zijlstra Cc: Pu Wen Cc: Reinette Chatre Cc: Thomas Gleixner Cc: Tony Luck Cc: x86-ml Link: https://lkml.kernel.org/r/20190130195621.GA30653@cmpxchg.org

Merge tag 'xtensa-20190201' of git://github.com/jcmvbkbc/linux-xtensa

2019-02-02T00:56:30+00:00

Pull xtensa fixes from Max Filippov: - fix ccount_timer_shutdown for secondary CPUs - fix secondary CPU initialization - fix secondary CPU reset vector clash with double exception vector - fix present CPUs when booting with 'maxcpus' parameter - limit possible CPUs by configured NR_CPUS - issue a warning if xtensa PIC is asked to retrigger anything other than software IRQ - fix masking/unmasking of the first two IRQs on xtensa MX PIC - fix typo in Kconfig description for user space unaligned access feature - fix Kconfig warning for selecting BUILTIN_DTB * tag 'xtensa-20190201' of git://github.com/jcmvbkbc/linux-xtensa: xtensa: SMP: limit number of possible CPUs by NR_CPUS xtensa: rename BUILTIN_DTB to BUILTIN_DTB_SOURCE xtensa: Fix typo use space=>user space drivers/irqchip: xtensa-mx: fix mask and unmask drivers/irqchip: xtensa: add warning to irq_retrigger xtensa: SMP: mark each possible CPU as present xtensa: smp_lx200_defconfig: fix vectors clash xtensa: SMP: fix secondary CPU initialization xtensa: SMP: fix ccount_timer_shutdown

Merge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux

2019-02-02T00:54:25+00:00

Pull arm64 fixes from Will Deacon: "Although we're still debugging a few minor arm64-specific issues in mainline, I didn't want to hold this lot up in the meantime. We've got an additional KASLR fix after the previous one wasn't quite complete, a fix for a performance regression when mapping executable pages into userspace and some fixes for kprobe blacklisting. All candidates for stable. Summary: - Fix module loading when KASLR is configured but disabled at runtime - Fix accidental IPI when mapping user executable pages - Ensure hyp-stub and KVM world switch code cannot be kprobed" * tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux: arm64: hibernate: Clean the __hyp_text to PoC after resume arm64: hyp-stub: Forbid kprobing of the hyp-stub arm64: kprobe: Always blacklist the KVM world-switch code arm64: kaslr: ensure randomized quantities are clean also when kaslr is off arm64: Do not issue IPIs for user executable ptes

x86_64: increase stack size for KASAN_EXTRA

2019-02-01T23:46:23+00:00

If the kernel is configured with KASAN_EXTRA, the stack size is increasted significantly because this option sets "-fstack-reuse" to "none" in GCC [1]. As a result, it triggers stack overrun quite often with 32k stack size compiled using GCC 8. For example, this reproducer https://github.com/linux-test-project/ltp/blob/master/testcases/kernel/syscalls/madvise/madvise06.c triggers a "corrupted stack end detected inside scheduler" very reliably with CONFIG_SCHED_STACK_END_CHECK enabled. There are just too many functions that could have a large stack with KASAN_EXTRA due to large local variables that have been called over and over again without being able to reuse the stacks. Some noticiable ones are size 7648 shrink_page_list 3584 xfs_rmap_convert 3312 migrate_page_move_mapping 3312 dev_ethtool 3200 migrate_misplaced_transhuge_page 3168 copy_process There are other 49 functions are over 2k in size while compiling kernel with "-Wframe-larger-than=" even with a related minimal config on this machine. Hence, it is too much work to change Makefiles for each object to compile without "-fsanitize-address-use-after-scope" individually. [1] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81715#c23 Although there is a patch in GCC 9 to help the situation, GCC 9 probably won't be released in a few months and then it probably take another 6-month to 1-year for all major distros to include it as a default. Hence, the stack usage with KASAN_EXTRA can be revisited again in 2020 when GCC 9 is everywhere. Until then, this patch will help users avoid stack overrun. This has already been fixed for arm64 for the same reason via 6e8830674ea ("arm64: kasan: Increase stack size for KASAN_EXTRA"). Link: http://lkml.kernel.org/r/20190109215209.2903-1-cai@lca.pw Signed-off-by: Qian Cai Cc: Thomas Gleixner Cc: Ingo Molnar Cc: Borislav Petkov Cc: "H. Peter Anvin" Cc: Andrey Ryabinin Cc: Alexander Potapenko Cc: Dmitry Vyukov Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

arch: unexport asm/shmparam.h for all architectures

2019-02-01T23:46:22+00:00

Most architectures do not export shmparam.h to user-space. $ find arch -name shmparam.h | sort arch/alpha/include/asm/shmparam.h arch/arc/include/asm/shmparam.h arch/arm64/include/asm/shmparam.h arch/arm/include/asm/shmparam.h arch/csky/include/asm/shmparam.h arch/ia64/include/asm/shmparam.h arch/mips/include/asm/shmparam.h arch/nds32/include/asm/shmparam.h arch/nios2/include/asm/shmparam.h arch/parisc/include/asm/shmparam.h arch/powerpc/include/asm/shmparam.h arch/s390/include/asm/shmparam.h arch/sh/include/asm/shmparam.h arch/sparc/include/asm/shmparam.h arch/x86/include/asm/shmparam.h arch/xtensa/include/asm/shmparam.h Strangely, some users of the asm-generic wrapper export shmparam.h $ git grep 'generic-y += shmparam.h' arch/c6x/include/uapi/asm/Kbuild:generic-y += shmparam.h arch/h8300/include/uapi/asm/Kbuild:generic-y += shmparam.h arch/hexagon/include/uapi/asm/Kbuild:generic-y += shmparam.h arch/m68k/include/uapi/asm/Kbuild:generic-y += shmparam.h arch/microblaze/include/uapi/asm/Kbuild:generic-y += shmparam.h arch/openrisc/include/uapi/asm/Kbuild:generic-y += shmparam.h arch/riscv/include/asm/Kbuild:generic-y += shmparam.h arch/unicore32/include/uapi/asm/Kbuild:generic-y += shmparam.h The newly added riscv correctly creates the asm-generic wrapper in the kernel space, but the others (c6x, h8300, hexagon, m68k, microblaze, openrisc, unicore32) create the one in the uapi directory. Digging into the git history, now I guess fcc8487d477a ("uapi: export all headers under uapi directories") was the misconversion. Prior to that commit, no architecture exported to shmparam.h As its commit description said, that commit exported shmparam.h for c6x, h8300, hexagon, m68k, openrisc, unicore32. 83f0124ad81e ("microblaze: remove asm-generic wrapper headers") accidentally exported shmparam.h for microblaze. This commit unexports shmparam.h for those architectures. There is no more reason to export include/uapi/asm-generic/shmparam.h, so it has been moved to include/asm-generic/shmparam.h Link: http://lkml.kernel.org/r/1546904307-11124-1-git-send-email-yamada.masahiro@socionext.com Signed-off-by: Masahiro Yamada Acked-by: Stafford Horne Cc: Geert Uytterhoeven Cc: Michal Simek Cc: Yoshinori Sato Cc: Richard Kuo Cc: Guan Xuetao Cc: Nicolas Dichtel Cc: Arnd Bergmann Cc: Aurelien Jacquiot Cc: Greentime Hu Cc: Guo Ren Cc: Palmer Dabbelt Cc: Stefan Kristiansson Cc: Mark Salter Cc: Albert Ou Cc: Jonas Bonn Cc: Vincent Chen Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

x86/kexec: Don't setup EFI info if EFI runtime is not enabled

2019-02-01T17:18:54+00:00

Kexec-ing a kernel with "efi=noruntime" on the first kernel's command line causes the following null pointer dereference: BUG: unable to handle kernel NULL pointer dereference at 0000000000000000 #PF error: [normal kernel read fault] Call Trace: efi_runtime_map_copy+0x28/0x30 bzImage64_load+0x688/0x872 arch_kexec_kernel_image_load+0x6d/0x70 kimage_file_alloc_init+0x13e/0x220 __x64_sys_kexec_file_load+0x144/0x290 do_syscall_64+0x55/0x1a0 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Just skip the EFI info setup if EFI runtime services are not enabled. [ bp: Massage commit message. ] Suggested-by: Dave Young Signed-off-by: Kairui Song Signed-off-by: Borislav Petkov Acked-by: Dave Young Cc: AKASHI Takahiro Cc: Andrew Morton Cc: Ard Biesheuvel Cc: bhe@redhat.com Cc: David Howells Cc: erik.schmauss@intel.com Cc: fanc.fnst@cn.fujitsu.com Cc: "H. Peter Anvin" Cc: Ingo Molnar Cc: kexec@lists.infradead.org Cc: lenb@kernel.org Cc: linux-acpi@vger.kernel.org Cc: Philipp Rudo Cc: rafael.j.wysocki@intel.com Cc: robert.moore@intel.com Cc: Thomas Gleixner Cc: x86-ml Cc: Yannik Sembritzki Link: https://lkml.kernel.org/r/20190118111310.29589-2-kasong@redhat.com