powerpc/mm: Fix hugetlb_free_pmd_range() and hugetlb_free_pud_range()
Commit
7bfe54b5f165 ("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: 7bfe54b5f165 ("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