subr_prf: Don't write kern.boot_tag if it's empty
This change allows one to set kern.boot_tag="" and not get a blank line preceding other boot messages. While this isn't super critical- blank lines are easy to filter out both mentally and in processing dmesg later- it allows for a mode of operation that matches previous behavior. I intend to MFC this whole series to stable/11 by the end of the month with boot_tag empty by default to make this effectively a nop in the stable branch.
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svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=337952
@ -1048,7 +1048,7 @@ msgbufinit(void *ptr, int size)
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if (msgbufmapped && oldp != msgbufp)
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msgbuf_copy(oldp, msgbufp);
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msgbufmapped = true;
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if (print_boot_tag)
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if (print_boot_tag && *current_boot_tag != '\0')
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printf("%s\n", current_boot_tag);
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oldp = msgbufp;
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}
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