sysfs: Add crash_notes_size to export percpu note size
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: "Eric W. Biederman" <ebiederm@xmission.com> Cc: Vivek Goyal <vgoyal@redhat.com> Signed-off-by: Zhang Yanfei <zhangyanfei@cn.fujitsu.com> Acked-by: Simon Horman <horms@verge.net.au> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -132,6 +132,17 @@ static ssize_t show_crash_notes(struct device *dev, struct device_attribute *att
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return rc;
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}
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static DEVICE_ATTR(crash_notes, 0400, show_crash_notes, NULL);
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static ssize_t show_crash_notes_size(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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ssize_t rc;
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rc = sprintf(buf, "%lu\n", sizeof(note_buf_t));
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return rc;
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}
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static DEVICE_ATTR(crash_notes_size, 0400, show_crash_notes_size, NULL);
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#endif
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/*
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@ -259,6 +270,9 @@ int __cpuinit register_cpu(struct cpu *cpu, int num)
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#ifdef CONFIG_KEXEC
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if (!error)
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error = device_create_file(&cpu->dev, &dev_attr_crash_notes);
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if (!error)
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error = device_create_file(&cpu->dev,
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&dev_attr_crash_notes_size);
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#endif
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return error;
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}
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