[LEDE-DEV] [PATCH] x86/64: enable CONFIG_X86_VSYSCALL_EMULATION in kernel config

[Stijn Segers]

Op ma, 19 feb 2018 om 1:43 , schreef Syrone Wong 
<wong.syrone at gmail.com>:
> It's fixed by 
> https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git/commit/?h=linux-4.9.y&id=83946c33b9b99b5bc6157cfbf3970265f006c2bf
> 
> Best Regards,
> Syrone Wong

Thanks, will send in a new patch.

Stijn

> 
> 
> On Mon, Feb 19, 2018 at 4:46 AM, Stijn Segers 
> <foss at volatilesystems.org> wrote:
>>  CONFIG_X86_VSYSCALL_EMULATION is disabled by default on x86/64, but 
>> without it the new KAISER stuff breaks
>>  in the way shown below:
>> 
>>   CC      arch/x86/mm/kaiser.o
>>  arch/x86/mm/kaiser.c: In function 'kaiser_init':
>>  arch/x86/mm/kaiser.c:348:8: error: 'vsyscall_pgprot' undeclared 
>> (first use in this function)
>>         vsyscall_pgprot);
>>         ^
>>  arch/x86/mm/kaiser.c:270:47: note: in definition of macro 
>> 'kaiser_add_user_map_early'
>>   int __ret = kaiser_add_user_map(start, size, flags); \
>>                                                ^~~~~
>>  arch/x86/mm/kaiser.c:348:8: note: each undeclared identifier is 
>> reported only once for each function it appears in
>>         vsyscall_pgprot);
>>         ^
>>  arch/x86/mm/kaiser.c:270:47: note: in definition of macro 
>> 'kaiser_add_user_map_early'
>>   int __ret = kaiser_add_user_map(start, size, flags); \
>>                                                ^~~~~
>>  scripts/Makefile.build:269: recipe for target 
>> 'arch/x86/mm/kaiser.o' failed
>> 
>>  Signed-off-by: Stijn Segers <foss at volatilesystems.org>
>>  ---
>>   target/linux/x86/64/config-default | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>> 
>>  diff --git a/target/linux/x86/64/config-default 
>> b/target/linux/x86/64/config-default
>>  index 7d38df3030..bad7dddbe3 100644
>>  --- a/target/linux/x86/64/config-default
>>  +++ b/target/linux/x86/64/config-default
>>  @@ -343,7 +343,7 @@ CONFIG_X86_MINIMUM_CPU_FAMILY=64
>>   CONFIG_X86_PM_TIMER=y
>>   # CONFIG_X86_POWERNOW_K8 is not set
>>   CONFIG_X86_TSC=y
>>  -# CONFIG_X86_VSYSCALL_EMULATION is not set
>>  +CONFIG_X86_VSYSCALL_EMULATION=y
>>   CONFIG_X86_X2APIC=y
>>   # CONFIG_X86_X32 is not set
>>   CONFIG_XEN=y
>>  --
>>  2.11.0
>> 
>> 
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