s390: warn about clearing als implied facilities (6d85dac2) · Commits · 戴 / test

arch/s390/boot/als.c

+3 −2

Original line number	Diff line number	Diff line
		@@ -7,6 +7,7 @@
		#include <asm/facility.h>
		#include <asm/lowcore.h>
		#include <asm/sclp.h>
		#include "boot.h"

		/*
		* The code within this file will be called very early. It may _not_
		@@ -58,7 +59,7 @@ static void u16_to_decimal(char *str, u16 val)
		*str = '\0';
		}

		static void print_missing_facilities(void)
		void print_missing_facilities(void)
		{
		static char als_str[80] = "Missing facilities: ";
		unsigned long val;
		@@ -90,7 +91,6 @@ static void print_missing_facilities(void)
		}
		strcat(als_str, "\n");
		sclp_early_printk(als_str);
		sclp_early_printk("See Principles of Operations for facility bits\n");
		}

		static void facility_mismatch(void)
		@@ -98,6 +98,7 @@ static void facility_mismatch(void)
		sclp_early_printk("The Linux kernel requires more recent processor hardware\n");
		print_machine_type();
		print_missing_facilities();
		sclp_early_printk("See Principles of Operations for facility bits\n");
		disabled_wait(0x8badcccc);
		}

+1 −0

Original line number	Diff line number	Diff line
		@@ -8,5 +8,6 @@ void store_ipl_parmblock(void);
		void setup_boot_command_line(void);
		void parse_boot_command_line(void);
		void setup_memory_end(void);
		void print_missing_facilities(void);

		#endif /* BOOT_BOOT_H */

+16 −0

Original line number	Diff line number	Diff line
		// SPDX-License-Identifier: GPL-2.0
		#include <linux/kernel.h>
		#include <linux/init.h>
		#include <linux/ctype.h>
		#include <asm/ebcdic.h>
		@@ -152,6 +153,20 @@ static void modify_facility(unsigned long nr, bool clear)
		__set_facility(nr, S390_lowcore.stfle_fac_list);
		}

		static void check_cleared_facilities(void)
		{
		unsigned long als[] = { FACILITIES_ALS };
		int i;

		for (i = 0; i < ARRAY_SIZE(als); i++) {
		if ((S390_lowcore.stfle_fac_list[i] & als[i]) != als[i]) {
		sclp_early_printk("Warning: The Linux kernel requires facilities cleared via command line option\n");
		print_missing_facilities();
		break;
		}
		}
		}

		static void modify_fac_list(char *str)
		{
		unsigned long val, endval;
		@@ -185,6 +200,7 @@ static void modify_fac_list(char *str)
		break;
		str++;
		}
		check_cleared_facilities();
		}

		static char command_line_buf[COMMAND_LINE_SIZE] __section(.data);