Re: [PATCH v2] x86/crash: Update the stale comment in reserve_crashkernel()

[Xunlei Pang]

On 01/23/2017 at 04:48 PM, Dave Young wrote:
> Hi, Xunlei
>
> On 01/23/17 at 02:48pm, Xunlei Pang wrote:
>> CRASH_KERNEL_ADDR_MAX has been missing for a long time,
>> update it with more detailed explanation.
>>
>> Cc: Robert LeBlanc 
>> Cc: Baoquan He 
>> Signed-off-by: Xunlei Pang 
>> ---
>>  arch/x86/kernel/setup.c | 4 +++-
>>  1 file changed, 3 insertions(+), 1 deletion(-)
>>
>> diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
>> index 4cfba94..c32a167 100644
>> --- a/arch/x86/kernel/setup.c
>> +++ b/arch/x86/kernel/setup.c
>> @@ -575,7 +575,9 @@ static void __init reserve_crashkernel(void)
>>  /* 0 means: find the address automatically */
>>  if (crash_base <= 0) {
>>  /*
>> - *  kexec want bzImage is below CRASH_KERNEL_ADDR_MAX
>> + * Set CRASH_ADDR_LOW_MAX upper bound for crash memory
>> + * as old kexec-tools loads bzImage below that, unless
>> + * "crashkernel=size[KMG],high" is specified.
> There is already comment before the define of those macros, also
> there are 32bit case which has a different reason about 512M there as
> well.

If we see from the kexec's perspective, we have a common CRASH_ADDR_LOW_MAX
definition for both x86 32-bit and 64-bit(32-bit x86 has the same value defined 
for
CRASH_ADDR_LOW_MAX and CRASH_ADDR_HIGH_MAX), so old kexec will load below
CRASH_ADDR_LOW_MAX,  so I think the description is fine :-)

Regards,
Xunlei

>
> So it looks better to just drop the one line comment without adding
> further comments here.
>>   */
>>  crash_base = memblock_find_in_range(CRASH_ALIGN,
>>  high ? CRASH_ADDR_HIGH_MAX
>> -- 
>> 1.8.3.1
>>
> Thanks
> Dave
>
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Re: [PATCH v2] x86/crash: Update the stale comment in reserve_crashkernel()

[Dave Young]

Hi, Xunlei

On 01/23/17 at 02:48pm, Xunlei Pang wrote:
> CRASH_KERNEL_ADDR_MAX has been missing for a long time,
> update it with more detailed explanation.
> 
> Cc: Robert LeBlanc 
> Cc: Baoquan He 
> Signed-off-by: Xunlei Pang 
> ---
>  arch/x86/kernel/setup.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
> index 4cfba94..c32a167 100644
> --- a/arch/x86/kernel/setup.c
> +++ b/arch/x86/kernel/setup.c
> @@ -575,7 +575,9 @@ static void __init reserve_crashkernel(void)
>   /* 0 means: find the address automatically */
>   if (crash_base <= 0) {
>   /*
> -  *  kexec want bzImage is below CRASH_KERNEL_ADDR_MAX
> +  * Set CRASH_ADDR_LOW_MAX upper bound for crash memory
> +  * as old kexec-tools loads bzImage below that, unless
> +  * "crashkernel=size[KMG],high" is specified.

There is already comment before the define of those macros, also
there are 32bit case which has a different reason about 512M there as
well.

So it looks better to just drop the one line comment without adding
further comments here.
>*/
>   crash_base = memblock_find_in_range(CRASH_ALIGN,
>   high ? CRASH_ADDR_HIGH_MAX
> -- 
> 1.8.3.1
> 

Thanks
Dave

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[PATCH v2] x86/crash: Update the stale comment in reserve_crashkernel()

[Xunlei Pang]

CRASH_KERNEL_ADDR_MAX has been missing for a long time,
update it with more detailed explanation.

Cc: Robert LeBlanc 
Cc: Baoquan He 
Signed-off-by: Xunlei Pang 
---
 arch/x86/kernel/setup.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index 4cfba94..c32a167 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -575,7 +575,9 @@ static void __init reserve_crashkernel(void)
/* 0 means: find the address automatically */
if (crash_base <= 0) {
/*
-*  kexec want bzImage is below CRASH_KERNEL_ADDR_MAX
+* Set CRASH_ADDR_LOW_MAX upper bound for crash memory
+* as old kexec-tools loads bzImage below that, unless
+* "crashkernel=size[KMG],high" is specified.
 */
crash_base = memblock_find_in_range(CRASH_ALIGN,
high ? CRASH_ADDR_HIGH_MAX
-- 
1.8.3.1


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