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6dd29b3df9
This reverts commit2947ba054a. Dan Williams reported dax-pmem kernel warnings with the following signature: WARNING: CPU: 8 PID: 245 at lib/percpu-refcount.c:155 percpu_ref_switch_to_atomic_rcu+0x1f5/0x200 percpu ref (dax_pmem_percpu_release [dax_pmem]) <= 0 (0) after switching to atomic ... and bisected it to this commit, which suggests possible memory corruption caused by the x86 fast-GUP conversion. He also pointed out: " This is similar to the backtrace when we were not properly handling pud faults and was fixed with this commit:220ced1676"mm: fix get_user_pages() vs device-dax pud mappings" I've found some missing _devmap checks in the generic get_user_pages_fast() path, but this does not fix the regression [...] " So given that there are known bugs, and a pretty robust looking bisection points to this commit suggesting that are unknown bugs in the conversion as well, revert it for the time being - we'll re-try in v4.13. Reported-by: Dan Williams <dan.j.williams@intel.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Michal Hocko <mhocko@suse.cz> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Rik van Riel <riel@redhat.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: aneesh.kumar@linux.vnet.ibm.com Cc: dann.frazier@canonical.com Cc: dave.hansen@intel.com Cc: steve.capper@linaro.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
41 lines
1.2 KiB
Makefile
41 lines
1.2 KiB
Makefile
# Kernel does not boot with instrumentation of tlb.c.
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KCOV_INSTRUMENT_tlb.o := n
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obj-y := init.o init_$(BITS).o fault.o ioremap.o extable.o pageattr.o mmap.o \
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pat.o pgtable.o physaddr.o gup.o setup_nx.o tlb.o
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# Make sure __phys_addr has no stackprotector
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nostackp := $(call cc-option, -fno-stack-protector)
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CFLAGS_physaddr.o := $(nostackp)
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CFLAGS_setup_nx.o := $(nostackp)
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CFLAGS_fault.o := -I$(src)/../include/asm/trace
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obj-$(CONFIG_X86_PAT) += pat_rbtree.o
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obj-$(CONFIG_X86_32) += pgtable_32.o iomap_32.o
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obj-$(CONFIG_HUGETLB_PAGE) += hugetlbpage.o
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obj-$(CONFIG_X86_PTDUMP_CORE) += dump_pagetables.o
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obj-$(CONFIG_X86_PTDUMP) += debug_pagetables.o
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obj-$(CONFIG_HIGHMEM) += highmem_32.o
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obj-$(CONFIG_KMEMCHECK) += kmemcheck/
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KASAN_SANITIZE_kasan_init_$(BITS).o := n
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obj-$(CONFIG_KASAN) += kasan_init_$(BITS).o
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obj-$(CONFIG_MMIOTRACE) += mmiotrace.o
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mmiotrace-y := kmmio.o pf_in.o mmio-mod.o
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obj-$(CONFIG_MMIOTRACE_TEST) += testmmiotrace.o
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obj-$(CONFIG_NUMA) += numa.o numa_$(BITS).o
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obj-$(CONFIG_AMD_NUMA) += amdtopology.o
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obj-$(CONFIG_ACPI_NUMA) += srat.o
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obj-$(CONFIG_NUMA_EMU) += numa_emulation.o
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obj-$(CONFIG_X86_INTEL_MPX) += mpx.o
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obj-$(CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS) += pkeys.o
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obj-$(CONFIG_RANDOMIZE_MEMORY) += kaslr.o
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