Le 12/09/2019 à 17:36, Christophe Leroy a écrit :

Le 12/09/2019 à 17:00, Christophe Leroy a écrit :

quoted

On 09/12/2019 06:02 AM, Anshuman Khandual wrote:

quoted

This adds a test module which will validate architecture page table 
helpers
and accessors regarding compliance with generic MM semantics 
expectations.
This will help various architectures in validating changes to the 
existing
page table helpers or addition of new ones.

Test page table and memory pages creating it's entries at various 
level are
all allocated from system memory with required alignments. If memory 
pages
with required size and alignment could not be allocated, then all 
depending
individual tests are skipped.

Build failure on powerpc book3s/32. This is because asm/highmem.h is 
missing. It can't be included from asm/book3s/32/pgtable.h because it 
creates circular dependency. So it has to be included from 
mm/arch_pgtable_test.c

In fact it is <linux/highmem.h> that needs to be added, adding 
<asm/highmem.h> directly provokes build failure at link time.

I get the following failure,

[    0.704685] ------------[ cut here ]------------
[    0.709239] initcall arch_pgtable_tests_init+0x0/0x228 returned with 
preemption imbalance
[    0.717539] WARNING: CPU: 0 PID: 1 at init/main.c:952 
do_one_initcall+0x18c/0x1d4
[    0.724922] CPU: 0 PID: 1 Comm: swapper Not tainted 
5.3.0-rc7-s3k-dev-00880-g28fd02a838e5-dirty #2307
[    0.734070] NIP:  c070e674 LR: c070e674 CTR: c001292c
[    0.739084] REGS: df4a5dd0 TRAP: 0700   Not tainted 
(5.3.0-rc7-s3k-dev-00880-g28fd02a838e5-dirty)
[    0.747975] MSR:  00029032 <EE,ME,IR,DR,RI>  CR: 28000222  XER: 00000000
[    0.754628]
[    0.754628] GPR00: c070e674 df4a5e88 df4a0000 0000004e 0000000a 
00000000 000000ca 38207265
[    0.754628] GPR08: 00001032 00000800 00000000 00000000 22000422 
00000000 c0004a7c 00000000
[    0.754628] GPR16: 00000000 00000000 00000000 00000000 00000000 
c0810000 c0800000 c0816f30
[    0.754628] GPR24: c070dc20 c074702c 00000006 0000009c 00000000 
c0724494 c074e140 00000000
[    0.789339] NIP [c070e674] do_one_initcall+0x18c/0x1d4
[    0.794435] LR [c070e674] do_one_initcall+0x18c/0x1d4
[    0.799437] Call Trace:
[    0.801867] [df4a5e88] [c070e674] do_one_initcall+0x18c/0x1d4 
(unreliable)
[    0.808694] [df4a5ee8] [c070e8c0] kernel_init_freeable+0x204/0x2dc
[    0.814830] [df4a5f28] [c0004a94] kernel_init+0x18/0x110
[    0.820107] [df4a5f38] [c00122ac] ret_from_kernel_thread+0x14/0x1c
[    0.826220] Instruction dump:
[    0.829161] 4beb1069 7d2000a6 61298000 7d200124 89210008 2f890000 
41be0048 3c60c06a
[    0.836849] 38a10008 7fa4eb78 3863cacc 4b915115 <0fe00000> 4800002c 
81220070 712a0004
[    0.844723] ---[ end trace 969d686308d40b33 ]---

Then starting init fails:

[    3.894074] Run /init as init process
[    3.898403] Failed to execute /init (error -14)
[    3.903009] Run /sbin/init as init process
[    3.907172] Run /etc/init as init process
[    3.911251] Run /bin/init as init process
[    3.915513] Run /bin/sh as init process
[    3.919471] Starting init: /bin/sh exists but couldn't execute it 
(error -14)
[    3.926732] Kernel panic - not syncing: No working init found.  Try 
passing init= option to kernel. See Linux 
Documentation/admin-guide/init.rst for guidance.
[    3.940864] CPU: 0 PID: 1 Comm: init Tainted: G        W 
5.3.0-rc7-s3k-dev-00880-g28fd02a838e5-dirty #2307
[    3.951165] Call Trace:
[    3.953617] [df4a5ec8] [c002392c] panic+0x12c/0x320 (unreliable)
[    3.959621] [df4a5f28] [c0004b8c] rootfs_mount+0x0/0x2c
[    3.964849] [df4a5f38] [c00122ac] ret_from_kernel_thread+0x14/0x1c


Christophe

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