Michael Ellerman [off-list ref] a écrit :

Christophe Leroy [off-list ref] writes:

quoted

The purpose of this serie is to activate CONFIG_THREAD_INFO_IN_TASK which
moves the thread_info into task_struct.

Moving thread_info into task_struct has the following advantages:
- It protects thread_info from corruption in the case of stack
overflows.
- Its address is harder to determine if stack addresses are
leaked, making a number of attacks more difficult.

Changes since v12:
 - Patch 1: Taken comment from Mike (re-introduced the 'panic' in  
case memblock allocation fails in setup_64.c
 - Patch 1: Added alloc_stack() function in setup_32.c to also  
panic in case of allocation failure.

Hi Christophe,

I can't get this series to boot on qemu mac99. I'm getting eg:

Problem new with version 13 or it is the first time you test ?

[    0.981514] NFS: Registering the id_resolver key type
[    0.981752] Key type id_resolver registered
[    0.981868] Key type id_legacy registered
[    0.995711] Unrecoverable exception 0 at 0 (msr=0)
[    0.996091] Oops: Unrecoverable exception, sig: 6 [#1]
[    0.996314] BE PAGE_SIZE=4K MMU=Hash PowerMac
[    0.996617] Modules linked in:
[    0.996869] CPU: 0 PID: 416 Comm: modprobe Not tainted  
5.0.0-rc2-gcc-7.3.0-00043-g53f2de798792 #342

Comm:modprobe  ==> Something wrong with modules ? I never tested with  
CONFIG_MODULES.

Christophe

[    0.997138] NIP:  00000000 LR: 00000000 CTR: 00000000
[    0.997309] REGS: ef237f50 TRAP: 0000   Not tainted   
(5.0.0-rc2-gcc-7.3.0-00043-g53f2de798792)
[    0.997508] MSR:  00000000 <>  CR: 00000000  XER: 00000000
[    0.997712]
[    0.997712] GPR00: 00000000 ef238000 00000000 00000000 00000000  
00000000 00000000 00000000
[    0.997712] GPR08: 00000000 00000000 00000000 00000000 00000000  
00000000 c006477c ef13d8c0
[    0.997712] GPR16: 00000000 00000000 00000000 00000000 00000000  
00000000 00000000 00000000
[    0.997712] GPR24: 00000000 00000000 00000000 00000000 00000000  
00000000 00000000 00000000
[    0.998671] NIP [00000000]   (null)
[    0.998774] LR [00000000]   (null)
[    0.998895] Call Trace:
[    0.999030] Instruction dump:
[    0.999320] XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX  
XXXXXXXX XXXXXXXX
[    0.999546] XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX 60000000 XXXXXXXX  
XXXXXXXX XXXXXXXX
[    1.000023] ---[ end trace 925ea3419844fe68 ]---

I haven't had time to dig any further.

cheers