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54fb07d030
"earlyprintk" option documentation does not clearly state which platform supports which additional values (e.g. ",keep"). Preserve old option behaviour and reuse str_has_prefix instead of strncmp for prefix testing. Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
37 lines
829 B
C
37 lines
829 B
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright IBM Corp. 2017
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*/
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#include <linux/console.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <asm/sclp.h>
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static void sclp_early_write(struct console *con, const char *s, unsigned int len)
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{
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__sclp_early_printk(s, len, 0);
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}
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static struct console sclp_early_console = {
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.name = "earlysclp",
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.write = sclp_early_write,
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.flags = CON_PRINTBUFFER | CON_BOOT,
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.index = -1,
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};
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static int __init setup_early_printk(char *buf)
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{
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if (early_console)
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return 0;
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/* Accept only "earlyprintk" and "earlyprintk=sclp" */
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if (buf && !str_has_prefix(buf, "sclp"))
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return 0;
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if (!sclp.has_linemode && !sclp.has_vt220)
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return 0;
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early_console = &sclp_early_console;
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register_console(early_console);
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return 0;
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}
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early_param("earlyprintk", setup_early_printk);
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