Hi, simon
I forgot to add your email in the CC, could you please help
reviewing this patch since I will send the kexec-tools patch
if this patch is accepted.
Thanks
Zhang
? 2013?03?28? 16:15, Zhang Yanfei ??:
> For percpu notes, we are exporting only address and not size. So
> the userspace tool kexec-tools is putting an upper limit of 1024
> and putting the value in p_memsz and p_filesz fields. So the patch
> add the new sysfile crash_notes_size to export the exact percpu
> note size and let the kexec-tools parse it intead of using 1024.
>
> The idea came from Vivek Goyal. And a later patch will be sent to
> kexec-tools to let it parse the size.
>
> Cc: Greg KH <gregkh at linuxfoundation.org>
> Cc: "Eric W. Biederman" <ebiederm at xmission.com>
> Cc: Vivek Goyal <vgoyal at redhat.com>
> Signed-off-by: Zhang Yanfei <zhangyanfei at cn.fujitsu.com>
> ---
> drivers/base/cpu.c | 14 ++++++++++++++
> 1 files changed, 14 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/base/cpu.c b/drivers/base/cpu.c
> index fb10728..a55b590 100644
> --- a/drivers/base/cpu.c
> +++ b/drivers/base/cpu.c
> @@ -132,6 +132,17 @@ static ssize_t show_crash_notes(struct device *dev, struct device_attribute *att
> return rc;
> }
> static DEVICE_ATTR(crash_notes, 0400, show_crash_notes, NULL);
> +
> +static ssize_t show_crash_notes_size(struct device *dev,
> + struct device_attribute *attr,
> + char *buf)
> +{
> + ssize_t rc;
> +
> + rc = sprintf(buf, "%lu\n", sizeof(note_buf_t));
> + return rc;
> +}
> +static DEVICE_ATTR(crash_notes_size, 0400, show_crash_notes_size, NULL);
> #endif
>
> /*
> @@ -259,6 +270,9 @@ int __cpuinit register_cpu(struct cpu *cpu, int num)
> #ifdef CONFIG_KEXEC
> if (!error)
> error = device_create_file(&cpu->dev, &dev_attr_crash_notes);
> + if (!error)
> + error = device_create_file(&cpu->dev,
> + &dev_attr_crash_notes_size);
> #endif
> return error;
> }
