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SubjectRe: [PATCH v3 0/8] huge vmalloc mappings
On Mon, 10 Aug 2020 12:27:24 +1000
Nicholas Piggin <npiggin@gmail.com> wrote:

> Not tested on x86 or arm64, would appreciate a quick test there so I can
> ask Andrew to put it in -mm. Other option is I can disable huge vmallocs
> for them for the time being.

Hi Nicholas,

For arm64 testing with a Kunpeng920.

I ran a quick sanity test with this series on top of mainline (yes mid merge window
so who knows what state is...). Could I be missing some dependency?

Without them it boots, with them it doesn't. Any immediate guesses?

[ 0.069507] Dentry cache hash table entries: 33554432 (order: 16, 268435456 bytes, vmalloc)
[ 0.087134] Inode-cache hash table entries: 16777216 (order: 15, 134217728 bytes, vmalloc)
[ 0.097044] Mount-cache hash table entries: 524288 (order: 10, 4194304 bytes, vmalloc)
[ 0.106534] Mountpoint-cache hash table entries: 524288 (order: 10, 4194304 bytes, vmalloc)
[ 0.116349] ------------[ cut here ]------------
[ 0.121465] kernel BUG at kernel/fork.c:402!
[ 0.126194] Internal error: Oops - BUG: 0 [#1] PREEMPT SMP
[ 0.132273] Modules linked in:
[ 0.135653] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.8.0-12307-g2b197e00c338 #637
[ 0.144240] pstate: 20000009 (nzCv daif -PAN -UAO BTYPE=--)
[ 0.150420] pc : copy_process+0x10c0/0x1690
[ 0.155049] lr : copy_process+0x2e0/0x1690
[ 0.159584] sp : ffffd96c55773d60
[ 0.163250] x29: ffffd96c55773d70 x28: ffff20bf87060000
[ 0.169134] x27: 0000000000800300 x26: 00000000ffffffff
[ 0.175018] x25: ffff8000108a8000 x24: ffffd96c55a32708
[ 0.180901] x23: ffff20bf87043800 x22: 0000000000000000
[ 0.186787] x21: 0000000000000000 x20: ffffd96c55773ef0
[ 0.192672] x19: ffffd96c55783bc0 x18: 0000000000000010
[ 0.198557] x17: 00000000855c858e x16: 00000000a8256fca
[ 0.204441] x15: ffffffffffffffff x14: ffff000000000000
[ 0.210327] x13: ffff800010901000 x12: ffff8000108b1000
[ 0.216212] x11: 0000000000000001 x10: ffffd96c55a6d000
[ 0.222096] x9 : ffffd96c53bf7594 x8 : 0000000000000041
[ 0.227980] x7 : ffff004fffffa6b0 x6 : ffff800010aa8000
[ 0.233864] x5 : 000000000000fffd x4 : 0000000000000000
[ 0.239748] x3 : ffffd96c55a63598 x2 : 0000000000000001
[ 0.245632] x1 : ffffd96c55783bc0 x0 : 0000000000000008
[ 0.251519] Call trace:
[ 0.254221] copy_process+0x10c0/0x1690
[ 0.258466] _do_fork+0x98/0x488
[ 0.262036] kernel_thread+0x6c/0x90
[ 0.265997] rest_init+0x38/0xf0
[ 0.269568] arch_call_rest_init+0x18/0x24
[ 0.274105] start_kernel+0x60c/0x644
[ 0.278159] Code: f000a441 f943f421 cb010000 17ffffe1 (d4210000)
[ 0.284961] ---[ end trace 985361e2cb97a0d9 ]---
[ 0.290073] Kernel panic - not syncing: Attempted to kill the idle task!
[ 0.297532] ---[ end Kernel panic - not syncing: Attempted to kill the idle task! ]---

Thanks,

Jonathan


>
> Since v2:
> - Rebased on vmalloc cleanups, split series into simpler pieces.
> - Fixed several compile errors and warnings
> - Keep the page array and accounting in small page units because
> struct vm_struct is an interface (this should fix x86 vmap stack debug
> assert). [Thanks Zefan]
>
> Nicholas Piggin (8):
> mm/vmalloc: fix vmalloc_to_page for huge vmap mappings
> mm: apply_to_pte_range warn and fail if a large pte is encountered
> mm/vmalloc: rename vmap_*_range vmap_pages_*_range
> lib/ioremap: rename ioremap_*_range to vmap_*_range
> mm: HUGE_VMAP arch support cleanup
> mm: Move vmap_range from lib/ioremap.c to mm/vmalloc.c
> mm/vmalloc: add vmap_range_noflush variant
> mm/vmalloc: Hugepage vmalloc mappings
>
> .../admin-guide/kernel-parameters.txt | 2 +
> arch/arm64/mm/mmu.c | 10 +-
> arch/powerpc/mm/book3s64/radix_pgtable.c | 8 +-
> arch/x86/mm/ioremap.c | 10 +-
> include/linux/io.h | 9 -
> include/linux/vmalloc.h | 13 +
> init/main.c | 1 -
> mm/ioremap.c | 231 +--------
> mm/memory.c | 60 ++-
> mm/vmalloc.c | 442 +++++++++++++++---
> 10 files changed, 453 insertions(+), 333 deletions(-)
>

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