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2198d4934e
linux/arch/powerpc
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Christophe Leroy 2198d4934e powerpc/mm: Fix hugetlb_free_pmd_range() and hugetlb_free_pud_range() 
Commit 7bfe54b5f1 ("powerpc/mm: Refactor the floor/ceiling check in
hugetlb range freeing functions") inadvertely removed the mask
applied to start parameter in those two functions, leading to the
following crash on power9.

  LTP: starting hugemmap05_1 (hugemmap05 -m)
  ------------[ cut here ]------------
  kernel BUG at arch/powerpc/mm/book3s64/pgtable.c:387!
  Oops: Exception in kernel mode, sig: 5 [#1]
  LE PAGE_SIZE=64K MMU=Radix SMP NR_CPUS=256 NUMA PowerNV
  ...
  CPU: 99 PID: 308 Comm: ksoftirqd/99 Tainted: G           O      5.10.0-rc7-next-20201211 #1
  NIP:  c00000000005dbec LR: c0000000003352f4 CTR: 0000000000000000
  REGS: c00020000bb6f830 TRAP: 0700   Tainted: G           O       (5.10.0-rc7-next-20201211)
  MSR:  900000000282b033 <SF,HV,VEC,VSX,EE,FP,ME,IR,DR,RI,LE>  CR: 24002284  XER: 20040000
  GPR00: c0000000003352f4 c00020000bb6fad0 c000000007f70b00 c0002000385b3ff0
  GPR04: 0000000000000000 0000000000000003 c00020000bb6f8b4 0000000000000001
  GPR08: 0000000000000001 0000000000000009 0000000000000008 0000000000000002
  GPR12: 0000000024002488 c000201fff649c00 c000000007f2a20c 0000000000000000
  GPR16: 0000000000000007 0000000000000000 c000000000194d10 c000000000194d10
  GPR24: 0000000000000014 0000000000000015 c000201cc6e72398 c000000007fac4b4
  GPR28: c000000007f2bf80 c000000007fac2f8 0000000000000008 c000200033870000
  NIP [c00000000005dbec] __tlb_remove_table+0x1dc/0x1e0
                         pgtable_free at arch/powerpc/mm/book3s64/pgtable.c:387
                         (inlined by) __tlb_remove_table at arch/powerpc/mm/book3s64/pgtable.c:405
  LR [c0000000003352f4] tlb_remove_table_rcu+0x54/0xa0
  Call Trace:
    __tlb_remove_table+0x13c/0x1e0 (unreliable)
    tlb_remove_table_rcu+0x54/0xa0
    __tlb_remove_table_free at mm/mmu_gather.c:101
    (inlined by) tlb_remove_table_rcu at mm/mmu_gather.c:156
    rcu_core+0x35c/0xbb0
    rcu_do_batch at kernel/rcu/tree.c:2502
    (inlined by) rcu_core at kernel/rcu/tree.c:2737
    __do_softirq+0x480/0x704
    run_ksoftirqd+0x74/0xd0
    run_ksoftirqd at kernel/softirq.c:651
    (inlined by) run_ksoftirqd at kernel/softirq.c:642
    smpboot_thread_fn+0x278/0x320
    kthread+0x1c4/0x1d0
    ret_from_kernel_thread+0x5c/0x80

Properly apply the masks before calling pmd_free_tlb() and
pud_free_tlb() respectively.

Fixes: 7bfe54b5f1 ("powerpc/mm: Refactor the floor/ceiling check in hugetlb range freeing functions")
Reported-by: Qian Cai <qcai@redhat.com>
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/56feccd7b6fcd98e353361a233fa7bb8e67c3164.1607780469.git.christophe.leroy@csgroup.eu
2020-12-15 22:22:07 +11:00
..
boot powerpc/boot: Make use of REL16 relocs in powerpc/boot/util.S 2020-12-04 01:00:44 +11:00
configs powerpc: add security.config, enforcing lockdown=integrity 2020-12-04 01:01:34 +11:00
crypto crypto: powerpc/crc-vpmsum_test - Fix sparse endianness warning 2020-09-04 17:57:15 +10:00
include powerpc: Inline setup_kup() 2020-12-15 13:13:49 +11:00
kernel powerpc/cacheinfo: Print correct cache-sibling map/list for L2 cache 2020-12-11 00:10:25 +11:00
kexec arch, drivers: replace for_each_membock() with for_each_mem_range() 2020-10-13 18:38:35 -07:00
kvm KVM: PPC: Book3S HV: Fix mask size for emulated msgsndp 2020-12-15 22:22:06 +11:00
lib powerpc/sstep: Add testcases for VSX vector paired load/store instructions 2020-12-11 00:09:10 +11:00
math-emu
mm powerpc/mm: Fix hugetlb_free_pmd_range() and hugetlb_free_pud_range() 2020-12-15 22:22:07 +11:00
net bpf, powerpc: Fix misuse of fallthrough in bpf_jit_comp() 2020-09-29 16:39:11 +02:00
oprofile powerpc/oprofile: fix spelling mistake "contex" -> "context" 2020-08-25 01:31:33 +10:00
perf powerpc/perf: Exclude kernel samples while counting events in user space. 2020-12-10 23:04:35 +11:00
platforms powerpc/64: irq replay remove decrementer overflow check 2020-12-09 23:48:15 +11:00
purgatory powerpc/kexec_file: Enable early kernel OPAL calls 2020-07-29 23:47:55 +10:00
sysdev powerpc/xive: Improve error reporting of OPAL calls 2020-12-11 09:53:11 +11:00
tools powerpc/tools: Remove 90 line limit in checkpatch script 2020-09-08 22:57:11 +10:00
xmon powerpc/xmon: Change printk() to pr_cont() 2020-12-04 21:56:30 +11:00
Kbuild
Kconfig powerpc: Increase NR_IRQS range to support more KVM guests 2020-12-11 09:53:10 +11:00
Kconfig.debug powerpc: Remove Xilinx PPC405/PPC440 support 2020-05-28 23:24:34 +10:00
Makefile powerpc/vdso: Retrieve sigtramp offsets at buildtime 2020-12-04 01:01:17 +11:00
Makefile.postlink powerpc: unrel_branch_check.sh: use nm to find symbol value 2020-09-02 11:00:22 +10:00