* Re: [PATCH] x86/boot/e820: add new chareater "-" to free BIOS memory in memmap bootargs
2018-04-10 2:59 ` [PATCH] x86/boot/e820: add new chareater "-" " zoucao
@ 2018-04-16 11:06 ` zoucao-ipc
2018-04-17 6:18 ` zoucao-ipc
2018-04-17 13:47 ` Thomas Gleixner
2 siblings, 0 replies; 10+ messages in thread
From: zoucao-ipc @ 2018-04-16 11:06 UTC (permalink / raw)
To: zoucao, tglx, mingo, hpa; +Cc: x86, linux-kernel
any suggestions？
On 2018/4/10 上午10:59, zoucao@linux.alibaba.com wrote:
> From: zoucao <zoucao@localhost.localdomain>
>
> Normally every BIOS reserved memory is used for some features, we can't
> use them, but in some conditions, users can ensure some BIOS memories
> are not used and reserved memory is well to free, they have not a good
> way to free these memories, here add a new chareater "-" in memmap to
> free reserved memory.
>
> Signed-off-by: zou cao <zoucao@linux.alibaba.com>
> ---
> 7u/Documentation/kernel-parameters.txt | 6 ++++++
> 7u/arch/x86/kernel/e820.c | 3 +++
> 2 files changed, 9 insertions(+)
>
> diff --git a/7u/Documentation/kernel-parameters.txt b/7u/Documentation/kernel-parameters.txt
> index 9a1abb99a..dbea75e12 100644
> --- a/7u/Documentation/kernel-parameters.txt
> +++ b/7u/Documentation/kernel-parameters.txt
> @@ -1677,6 +1677,12 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
> or
> memmap=0x10000$0x18690000
>
> + memmap=nn[KMG]-ss[KMG]
> + Free E820 reserved memory, as specified by the user.
> + Region of reserved memory to be free, from ss to ss+nn.
> + Example: free reserved memory from 0x18690000-0x186a0000
> + memmap=0x4101000-0x6aeff000
> +
> memory_corruption_check=0/1 [X86]
> Some BIOSes seem to corrupt the first 64k of
> memory when doing things like suspend/resume.
> diff --git a/7u/arch/x86/kernel/e820.c b/7u/arch/x86/kernel/e820.c
> index 174da5fc5..b8a042981 100644
> --- a/7u/arch/x86/kernel/e820.c
> +++ b/7u/arch/x86/kernel/e820.c
> @@ -875,6 +875,9 @@ static int __init parse_memmap_one(char *p)
> } else if (*p == '$') {
> start_at = memparse(p+1, &p);
> e820_add_region(start_at, mem_size, E820_RESERVED);
> + } else if (*p == '-') {
> + start_at = memparse(p+1, &p);
> + e820_remove_range(start_at, mem_size, E820_RESERVED, E820_RAM);
> } else
> e820_remove_range(mem_size, ULLONG_MAX - mem_size, E820_RAM, 1);
>
^ permalink raw reply [flat|nested] 10+ messages in thread* Re: [PATCH] x86/boot/e820: add new chareater "-" to free BIOS memory in memmap bootargs
2018-04-10 2:59 ` [PATCH] x86/boot/e820: add new chareater "-" " zoucao
2018-04-16 11:06 ` zoucao-ipc
@ 2018-04-17 6:18 ` zoucao-ipc
2018-04-17 10:22 ` Thomas Gleixner
2018-04-17 13:47 ` Thomas Gleixner
2 siblings, 1 reply; 10+ messages in thread
From: zoucao-ipc @ 2018-04-17 6:18 UTC (permalink / raw)
To: tglx, mingo, hpa; +Cc: zoucao, x86, linux-kernel
ping?
On 2018/4/10 上午10:59, zoucao@linux.alibaba.com wrote:
> From: zoucao <zoucao@localhost.localdomain>
>
> Normally every BIOS reserved memory is used for some features, we can't
> use them, but in some conditions, users can ensure some BIOS memories
> are not used and reserved memory is well to free, they have not a good
> way to free these memories, here add a new chareater "-" in memmap to
> free reserved memory.
>
> Signed-off-by: zou cao <zoucao@linux.alibaba.com>
> ---
> 7u/Documentation/kernel-parameters.txt | 6 ++++++
> 7u/arch/x86/kernel/e820.c | 3 +++
> 2 files changed, 9 insertions(+)
>
> diff --git a/7u/Documentation/kernel-parameters.txt b/7u/Documentation/kernel-parameters.txt
> index 9a1abb99a..dbea75e12 100644
> --- a/7u/Documentation/kernel-parameters.txt
> +++ b/7u/Documentation/kernel-parameters.txt
> @@ -1677,6 +1677,12 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
> or
> memmap=0x10000$0x18690000
>
> + memmap=nn[KMG]-ss[KMG]
> + Free E820 reserved memory, as specified by the user.
> + Region of reserved memory to be free, from ss to ss+nn.
> + Example: free reserved memory from 0x18690000-0x186a0000
> + memmap=0x4101000-0x6aeff000
> +
> memory_corruption_check=0/1 [X86]
> Some BIOSes seem to corrupt the first 64k of
> memory when doing things like suspend/resume.
> diff --git a/7u/arch/x86/kernel/e820.c b/7u/arch/x86/kernel/e820.c
> index 174da5fc5..b8a042981 100644
> --- a/7u/arch/x86/kernel/e820.c
> +++ b/7u/arch/x86/kernel/e820.c
> @@ -875,6 +875,9 @@ static int __init parse_memmap_one(char *p)
> } else if (*p == '$') {
> start_at = memparse(p+1, &p);
> e820_add_region(start_at, mem_size, E820_RESERVED);
> + } else if (*p == '-') {
> + start_at = memparse(p+1, &p);
> + e820_remove_range(start_at, mem_size, E820_RESERVED, E820_RAM);
> } else
> e820_remove_range(mem_size, ULLONG_MAX - mem_size, E820_RAM, 1);
>
^ permalink raw reply [flat|nested] 10+ messages in thread* Re: [PATCH] x86/boot/e820: add new chareater "-" to free BIOS memory in memmap bootargs
2018-04-17 6:18 ` zoucao-ipc
@ 2018-04-17 10:22 ` Thomas Gleixner
2018-04-17 13:11 ` zoucao-ipc
0 siblings, 1 reply; 10+ messages in thread
From: Thomas Gleixner @ 2018-04-17 10:22 UTC (permalink / raw)
To: zoucao-ipc; +Cc: mingo, hpa, zoucao, x86, linux-kernel
On Tue, 17 Apr 2018, zoucao-ipc wrote:
> ping?
You already pinged yesterday. Are you going to switch to hourly pings
tomorrow?
^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: [PATCH] x86/boot/e820: add new chareater "-" to free BIOS memory in memmap bootargs
2018-04-17 10:22 ` Thomas Gleixner
@ 2018-04-17 13:11 ` zoucao-ipc
0 siblings, 0 replies; 10+ messages in thread
From: zoucao-ipc @ 2018-04-17 13:11 UTC (permalink / raw)
To: Thomas Gleixner; +Cc: mingo, hpa, zoucao, x86, linux-kernel
Hi thomas:
Sorry, i don't receive yesterday email, i think the ping email is lost,
so bad me.
Anyway，have you some suggestions for this little patch? i really need
your help.
Regards,
czou
On 2018/4/17 下午6:22, Thomas Gleixner wrote:
> On Tue, 17 Apr 2018, zoucao-ipc wrote:
>
>> ping?
> You already pinged yesterday. Are you going to switch to hourly pings
> tomorrow?
>
^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: [PATCH] x86/boot/e820: add new chareater "-" to free BIOS memory in memmap bootargs
2018-04-10 2:59 ` [PATCH] x86/boot/e820: add new chareater "-" " zoucao
2018-04-16 11:06 ` zoucao-ipc
2018-04-17 6:18 ` zoucao-ipc
@ 2018-04-17 13:47 ` Thomas Gleixner
2018-04-17 14:40 ` zoucao-ipc
2 siblings, 1 reply; 10+ messages in thread
From: Thomas Gleixner @ 2018-04-17 13:47 UTC (permalink / raw)
To: zoucao; +Cc: mingo, hpa, x86, linux-kernel
On Tue, 10 Apr 2018, zoucao@linux.alibaba.com wrote:
> From: zoucao <zoucao@localhost.localdomain>
Interesting from ... Please use your real mail address for this.
> Normally every BIOS reserved memory is used for some features, we can't
> use them, but in some conditions, users can ensure some BIOS memories
> are not used and reserved memory is well to free, they have not a good
> way to free these memories, here add a new chareater "-" in memmap to
> free reserved memory.
I'm not really convinced about this. How should anyone without detailed
BIOS knowledge know that this is really reusable?
The person who knows must have access to the BIOS developer, so why can't
the BIOS be fixed instead?
Thanks,
tglx
> Signed-off-by: zou cao <zoucao@linux.alibaba.com>
> ---
> 7u/Documentation/kernel-parameters.txt | 6 ++++++
> 7u/arch/x86/kernel/e820.c | 3 +++
> 2 files changed, 9 insertions(+)
>
> diff --git a/7u/Documentation/kernel-parameters.txt b/7u/Documentation/kernel-parameters.txt
> index 9a1abb99a..dbea75e12 100644
> --- a/7u/Documentation/kernel-parameters.txt
> +++ b/7u/Documentation/kernel-parameters.txt
> @@ -1677,6 +1677,12 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
> or
> memmap=0x10000$0x18690000
>
> + memmap=nn[KMG]-ss[KMG]
> + Free E820 reserved memory, as specified by the user.
> + Region of reserved memory to be free, from ss to ss+nn.
> + Example: free reserved memory from 0x18690000-0x186a0000
> + memmap=0x4101000-0x6aeff000
> +
> memory_corruption_check=0/1 [X86]
> Some BIOSes seem to corrupt the first 64k of
> memory when doing things like suspend/resume.
> diff --git a/7u/arch/x86/kernel/e820.c b/7u/arch/x86/kernel/e820.c
> index 174da5fc5..b8a042981 100644
> --- a/7u/arch/x86/kernel/e820.c
> +++ b/7u/arch/x86/kernel/e820.c
> @@ -875,6 +875,9 @@ static int __init parse_memmap_one(char *p)
> } else if (*p == '$') {
> start_at = memparse(p+1, &p);
> e820_add_region(start_at, mem_size, E820_RESERVED);
> + } else if (*p == '-') {
> + start_at = memparse(p+1, &p);
> + e820_remove_range(start_at, mem_size, E820_RESERVED, E820_RAM);
> } else
> e820_remove_range(mem_size, ULLONG_MAX - mem_size, E820_RAM, 1);
>
> --
> 2.14.1.40.g8e62ba1
>
>
^ permalink raw reply [flat|nested] 10+ messages in thread* Re: [PATCH] x86/boot/e820: add new chareater "-" to free BIOS memory in memmap bootargs
2018-04-17 13:47 ` Thomas Gleixner
@ 2018-04-17 14:40 ` zoucao-ipc
0 siblings, 0 replies; 10+ messages in thread
From: zoucao-ipc @ 2018-04-17 14:40 UTC (permalink / raw)
To: Thomas Gleixner, zoucao; +Cc: mingo, hpa, x86, linux-kernel
On 2018/4/17 下午9:47, Thomas Gleixner wrote:
> On Tue, 10 Apr 2018, zoucao@linux.alibaba.com wrote:
>> From: zoucao <zoucao@localhost.localdomain>
> Interesting from ... Please use your real mail address for this.
miss this, i will do it.
>> Normally every BIOS reserved memory is used for some features, we can't
>> use them, but in some conditions, users can ensure some BIOS memories
>> are not used and reserved memory is well to free, they have not a good
>> way to free these memories, here add a new chareater "-" in memmap to
>> free reserved memory.
> I'm not really convinced about this. How should anyone without detailed
> BIOS knowledge know that this is really reusable?
>
> The person who knows must have access to the BIOS developer, so why can't
> the BIOS be fixed instead?
>
> Thanks,
>
> tglx
>
>> Signed-off-by: zou cao <zoucao@linux.alibaba.com>
>> ---
>> 7u/Documentation/kernel-parameters.txt | 6 ++++++
>> 7u/arch/x86/kernel/e820.c | 3 +++
>> 2 files changed, 9 insertions(+)
>>
>> diff --git a/7u/Documentation/kernel-parameters.txt b/7u/Documentation/kernel-parameters.txt
>> index 9a1abb99a..dbea75e12 100644
>> --- a/7u/Documentation/kernel-parameters.txt
>> +++ b/7u/Documentation/kernel-parameters.txt
>> @@ -1677,6 +1677,12 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
>> or
>> memmap=0x10000$0x18690000
>>
>> + memmap=nn[KMG]-ss[KMG]
>> + Free E820 reserved memory, as specified by the user.
>> + Region of reserved memory to be free, from ss to ss+nn.
>> + Example: free reserved memory from 0x18690000-0x186a0000
>> + memmap=0x4101000-0x6aeff000
>> +
>> memory_corruption_check=0/1 [X86]
>> Some BIOSes seem to corrupt the first 64k of
>> memory when doing things like suspend/resume.
>> diff --git a/7u/arch/x86/kernel/e820.c b/7u/arch/x86/kernel/e820.c
>> index 174da5fc5..b8a042981 100644
>> --- a/7u/arch/x86/kernel/e820.c
>> +++ b/7u/arch/x86/kernel/e820.c
>> @@ -875,6 +875,9 @@ static int __init parse_memmap_one(char *p)
>> } else if (*p == '$') {
>> start_at = memparse(p+1, &p);
>> e820_add_region(start_at, mem_size, E820_RESERVED);
>> + } else if (*p == '-') {
>> + start_at = memparse(p+1, &p);
>> + e820_remove_range(start_at, mem_size, E820_RESERVED, E820_RAM);
>> } else
>> e820_remove_range(mem_size, ULLONG_MAX - mem_size, E820_RAM, 1);
>>
>> --
>> 2.14.1.40.g8e62ba1
>>
>>
^ permalink raw reply [flat|nested] 10+ messages in thread