linux-kernel - Re: [PATCH] kdump, vmcoreinfo: Export sme_me

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Message-ID: <d6f93848-c750-f29c-4ca7-9661596cad62@redhat.com>
Date:   Mon, 29 Oct 2018 17:29:16 +0800
From:   lijiang <lijiang@...hat.com>
To:     Baoquan He <bhe@...hat.com>
Cc:     Borislav Petkov <bp@...en8.de>, Petr Tesarik <ptesarik@...e.cz>,
        linux-kernel@...r.kernel.org, x86@...nel.org,
        kexec@...ts.infradead.org, mingo@...hat.com, tglx@...utronix.de,
        dyoung@...hat.com
Subject: Re: [PATCH] kdump, vmcoreinfo: Export sme_me_mask value to vmcoreinfo

在 2018年10月29日 16:31, Baoquan He 写道:
> On 10/29/18 at 03:59pm, lijiang wrote:
>> diff --git a/arch/x86/kernel/machine_kexec_64.c b/arch/x86/kernel/machine_kexec_64.c
>> index 4c8acdfdc5a7..de363796ed20 100644
>> --- a/arch/x86/kernel/machine_kexec_64.c
>> +++ b/arch/x86/kernel/machine_kexec_64.c
>> @@ -29,6 +29,9 @@
>>  #include <asm/setup.h>
>>  #include <asm/set_memory.h>
>>
>> +u64 sme_mask;
>> +EXPORT_SYMBOL(sme_mask);
> 
> Wondering why it is global. Who else will use it?
> 
In general, no need to export the symbol of local variable.

Ok, i will change it to a local variable and export it.

Thanks.
Lianbo

>> +
>>  #ifdef CONFIG_KEXEC_FILE
>>  const struct kexec_file_ops * const kexec_file_loaders[] = {
>>                 &kexec_bzImage64_ops,
>> @@ -357,6 +360,9 @@ void arch_crash_save_vmcoreinfo(void)
>>         vmcoreinfo_append_str("NUMBER(pgtable_l5_enabled)=%d\n",
>>                         pgtable_l5_enabled());
>>
>> +       sme_mask = sme_me_mask;
>> +       VMCOREINFO_NUMBER(sme_mask);
>> +
>>  #ifdef CONFIG_NUMA
>>         VMCOREINFO_SYMBOL(node_data);
>>         VMCOREINFO_LENGTH(node_data, MAX_NUMNODES);