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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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9429ec96c2
The userspace part of UML uses the asm-offsets.h generator mechanism to
create definitions for UM_KERN_<LEVEL> that match the in-kernel
KERN_<LEVEL> constant definitions.
As of commit 04d2c8c83d ("printk: convert
the format for KERN_<LEVEL> to a 2 byte pattern"), KERN_<LEVEL> is no
longer expanded to the literal '"<LEVEL>"', but to '"\001" "LEVEL"', i.e.
it contains two parts.
However, the combo of DEFINE_STR() in
arch/x86/um/shared/sysdep/kernel-offsets.h and sed-y in Kbuild doesn't
support string literals consisting of multiple parts. Hence for all
UM_KERN_<LEVEL> definitions, only the SOH character is retained in the actual
definition, while the remainder ends up in the comment. E.g. in
include/generated/asm-offsets.h we get
#define UM_KERN_INFO "\001" /* "6" KERN_INFO */
instead of
#define UM_KERN_INFO "\001" "6" /* KERN_INFO */
This causes spurious '^A' output in some kernel messages:
Calibrating delay loop... 4640.76 BogoMIPS (lpj=23203840)
pid_max: default: 32768 minimum: 301
Mount-cache hash table entries: 256
^AChecking that host ptys support output SIGIO...Yes
^AChecking that host ptys support SIGIO on close...No, enabling workaround
^AUsing 2.6 host AIO
NET: Registered protocol family 16
bio: create slab <bio-0> at 0
Switching to clocksource itimer
To fix this:
- Move the mapping from UM_KERN_<LEVEL> to KERN_<LEVEL> from
arch/um/include/shared/common-offsets.h to
arch/um/include/shared/user.h, which is preincluded for all userspace
parts,
- Preinclude include/linux/kern_levels.h for all userspace parts, to
obtain the in-kernel KERN_<LEVEL> constant definitions. This doesn't
violate the kernel/userspace separation, as include/linux/kern_levels.h
is self-contained and doesn't expose any other kernel internals.
- Remove the now unused STR() and DEFINE_STR() macros.
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Richard Weinberger <richard@nod.at>
58 lines
1.5 KiB
C
58 lines
1.5 KiB
C
/*
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* Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
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* Licensed under the GPL
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*/
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#ifndef __USER_H__
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#define __USER_H__
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#include <generated/asm-offsets.h>
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/*
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* The usual definition - copied here because the kernel provides its own,
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* fancier, type-safe, definition. Using that one would require
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* copying too much infrastructure for my taste, so userspace files
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* get less checking than kernel files.
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*/
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#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
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/* This is to get size_t */
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#ifdef __KERNEL__
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#include <linux/types.h>
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#else
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#include <stddef.h>
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#endif
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extern void panic(const char *fmt, ...)
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__attribute__ ((format (printf, 1, 2)));
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/* Requires preincluding include/linux/kern_levels.h */
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#define UM_KERN_EMERG KERN_EMERG
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#define UM_KERN_ALERT KERN_ALERT
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#define UM_KERN_CRIT KERN_CRIT
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#define UM_KERN_ERR KERN_ERR
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#define UM_KERN_WARNING KERN_WARNING
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#define UM_KERN_NOTICE KERN_NOTICE
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#define UM_KERN_INFO KERN_INFO
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#define UM_KERN_DEBUG KERN_DEBUG
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#define UM_KERN_CONT KERN_CONT
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#ifdef UML_CONFIG_PRINTK
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extern int printk(const char *fmt, ...)
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__attribute__ ((format (printf, 1, 2)));
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#else
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static inline int printk(const char *fmt, ...)
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{
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return 0;
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}
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#endif
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extern int in_aton(char *str);
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extern size_t strlcpy(char *, const char *, size_t);
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extern size_t strlcat(char *, const char *, size_t);
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/* Copied from linux/compiler-gcc.h since we can't include it directly */
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#define barrier() __asm__ __volatile__("": : :"memory")
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#endif
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