mm/pgtable: add stubs for {pmd/pub}_{set/clear}_huge
Christophe Leroy
christophe.leroy at csgroup.eu
Mon Jul 19 09:15:59 PDT 2021
Geert Uytterhoeven <geert at linux-m68k.org> a écrit :
> Hi Christophe,
Hi Geert, I'm currently on holidays, I'll have a look when I'm back
first week of August. Sorry for the inconvenience
>
> On Fri, Jul 2, 2021 at 10:16 PM Linux Kernel Mailing List
> <linux-kernel at vger.kernel.org> wrote:
>> Commit: c742199a014de23ee92055c2473d91fe5561ffdf
>> Parent: 79c1c594f49a88fba9744cb5c85978c6b1b365ec
>> Refname: refs/heads/master
>> Web:
>> https://git.kernel.org/torvalds/c/c742199a014de23ee92055c2473d91fe5561ffdf
>> Author: Christophe Leroy <christophe.leroy at csgroup.eu>
>> AuthorDate: Wed Jun 30 18:48:03 2021 -0700
>> Committer: Linus Torvalds <torvalds at linux-foundation.org>
>> CommitDate: Wed Jun 30 20:47:26 2021 -0700
>>
>> mm/pgtable: add stubs for {pmd/pub}_{set/clear}_huge
>>
>> For architectures with no PMD and/or no PUD, add stubs similar
>> to what we
>> have for architectures without P4D.
>>
>> [christophe.leroy at csgroup.eu: arm64: define only
>> {pud/pmd}_{set/clear}_huge when useful]
>> Link:
>> https://lkml.kernel.org/r/73ec95f40cafbbb69bdfb43a7f53876fd845b0ce.1620990479.git.christophe.leroy@csgroup.eu
>> [christophe.leroy at csgroup.eu: x86: define only
>> {pud/pmd}_{set/clear}_huge when useful]
>> Link:
>> https://lkml.kernel.org/r/7fbf1b6bc3e15c07c24fa45278d57064f14c896b.1620930415.git.christophe.leroy@csgroup.eu
>>
>> Link:
>> https://lkml.kernel.org/r/5ac5976419350e8e048d463a64cae449eb3ba4b0.1620795204.git.christophe.leroy@csgroup.eu
>> Signed-off-by: Christophe Leroy <christophe.leroy at csgroup.eu>
>> Cc: Benjamin Herrenschmidt <benh at kernel.crashing.org>
>> Cc: Michael Ellerman <mpe at ellerman.id.au>
>> Cc: Mike Kravetz <mike.kravetz at oracle.com>
>> Cc: Mike Rapoport <rppt at kernel.org>
>> Cc: Nicholas Piggin <npiggin at gmail.com>
>> Cc: Paul Mackerras <paulus at samba.org>
>> Cc: Uladzislau Rezki <uladzislau.rezki at sony.com>
>> Cc: Naresh Kamboju <naresh.kamboju at linaro.org>
>> Signed-off-by: Andrew Morton <akpm at linux-foundation.org>
>> Signed-off-by: Linus Torvalds <torvalds at linux-foundation.org>
>
> Since this commit, both WARN_ON() tests in pud_huge_tests() are
> triggering on arm64 if CONFIG_ARM64_VA_BITS_39=y and
> CONFIG_PGTABLE_LEVELS=3:
>
> ------------[ cut here ]------------
> WARNING: CPU: 0 PID: 1 at mm/debug_vm_pgtable.c:438
> debug_vm_pgtable+0x6d0/0x7c4
> Modules linked in:
> CPU: 0 PID: 1 Comm: swapper/0 Not tainted
> 5.13.0-salvator-x-00209-gc742199a014d #1068
> Hardware name: Renesas Salvator-X 2nd version board based on
> r8a77951 (DT)
> pstate: a0400005 (NzCv daif +PAN -UAO -TCO BTYPE=--)
> pc : debug_vm_pgtable+0x6d0/0x7c4
> lr : debug_vm_pgtable+0x6cc/0x7c4
> sp : ffffffc0124cbd00
> x29: ffffffc0124cbd00 x28: 0000000000000c30 x27: ffffff84c5e465a0
> x26: ffffff84c5e46000 x25: ffffff84c5e42000 x24: 00000000000005a0
> x23: ffffffc010c41000 x22: 0020000050cb0fc3 x21: ffffff84c5e45ed0
> x20: ffffff84c27470a8 x19: ffffff84c2747040 x18: 0000000000000cc0
> x17: 00000000b2491cf5 x16: 0000000000000014 x15: 0000000000000000
> x14: 0000000000000002 x13: 00000000000b56dd x12: 0000000000000901
> x11: ffffffc01116d040 x10: 00000000000038e4 x9 : 00000000ffffffff
> x8 : 0000000000000000 x7 : ffffffc010cc4cd0 x6 : 0000000000000000
> x5 : 000000000004028e x4 : 0000000000000000 x3 : 0000000000000000
> x2 : 0000000000000001 x1 : 0000000000000000 x0 : ffffff84c08bc040
> Call trace:
> debug_vm_pgtable+0x6d0/0x7c4
> do_one_initcall+0xec/0x278
> kernel_init_freeable+0x220/0x224
> kernel_init+0x10/0x108
> ret_from_fork+0x10/0x18
> irq event stamp: 1062694
> hardirqs last enabled at (1062693): [<ffffffc0101bb030>]
> free_unref_page+0x120/0x138
> hardirqs last disabled at (1062694): [<ffffffc01085f31c>]
> el1_dbg+0x24/0x4c
> softirqs last enabled at (1062636): [<ffffffc0100101c8>]
> _stext+0x1c8/0x43c
> softirqs last disabled at (1062627): [<ffffffc010080020>]
> __irq_exit_rcu+0xdc/0x124
> ---[ end trace 864024bcea12ea00 ]---
> ------------[ cut here ]------------
> WARNING: CPU: 0 PID: 1 at mm/debug_vm_pgtable.c:439
> debug_vm_pgtable+0x6d4/0x7c4
> Modules linked in:
> CPU: 0 PID: 1 Comm: swapper/0 Tainted: G W
> 5.13.0-salvator-x-00209-gc742199a014d #1068
> Hardware name: Renesas Salvator-X 2nd version board based on
> r8a77951 (DT)
> pstate: a0400005 (NzCv daif +PAN -UAO -TCO BTYPE=--)
> pc : debug_vm_pgtable+0x6d4/0x7c4
> lr : debug_vm_pgtable+0x6cc/0x7c4
> sp : ffffffc0124cbd00
> x29: ffffffc0124cbd00 x28: 0000000000000c30 x27: ffffff84c5e465a0
> x26: ffffff84c5e46000 x25: ffffff84c5e42000 x24: 00000000000005a0
> x23: ffffffc010c41000 x22: 0020000050cb0fc3 x21: ffffff84c5e45ed0
> x20: ffffff84c27470a8 x19: ffffff84c2747040 x18: 0000000000000cc0
> x17: 00000000b2491cf5 x16: 0000000000000014 x15: 0000000000000000
> x14: 0000000000000002 x13: 00000000000b56dd x12: 0000000000000901
> x11: ffffffc01116d040 x10: 00000000000038e4 x9 : 00000000ffffffff
> x8 : 0000000000000000 x7 : ffffffc010cc4cd0 x6 : 0000000000000000
> x5 : 000000000004028e x4 : 0000000000000000 x3 : 0000000000000000
> x2 : 0000000000000001 x1 : 0000000000000000 x0 : ffffff84c08bc040
> Call trace:
> debug_vm_pgtable+0x6d4/0x7c4
> do_one_initcall+0xec/0x278
> kernel_init_freeable+0x220/0x224
> kernel_init+0x10/0x108
> ret_from_fork+0x10/0x18
> irq event stamp: 1062706
> hardirqs last enabled at (1062705): [<ffffffc01085ef80>]
> exit_to_kernel_mode+0xf0/0x100
> hardirqs last disabled at (1062706): [<ffffffc01085f31c>]
> el1_dbg+0x24/0x4c
> softirqs last enabled at (1062704): [<ffffffc0100101c8>]
> _stext+0x1c8/0x43c
> softirqs last disabled at (1062697): [<ffffffc010080020>]
> __irq_exit_rcu+0xdc/0x124
> ---[ end trace 864024bcea12ea01 ]---
>
> Switching to CONFIG_ARM64_VA_BITS_48=y and CONFIG_PGTABLE_LEVELS=4
> makes the warning disappear.
>
> Gr{oetje,eeting}s,
>
> Geert
>
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 --
> geert at linux-m68k.org
>
> In personal conversations with technical people, I call myself a hacker. But
> when I'm talking to journalists I just say "programmer" or something
> like that.
> -- Linus Torvalds
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