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kexec: add bit definitions for kimage entry flags

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Define new kexec preprocessor macros IND_*_BIT that define the bit
position of the kimage entry flags.  Change the existing IND_* flag macros
to be defined as bit shifts of the corresponding IND_*_BIT macros.  Also
wrap all C language code in kexec.h with #if !defined(__ASSEMBLY__) so
assembly files can include kexec.h to get the IND_* and IND_*_BIT macros.

Some CPU instruction sets have tests for bit position which are convenient
in implementing routines that operate on the kimage entry list.  The
addition of these bit position macros in a common location will avoid
duplicate definitions and the chance that changes to the IND_* flags will
not be propagated to assembly files.

Signed-off-by: Geoff Levand <geoff@infradead.org>
Acked-by: Vivek Goyal <vgoyal@redhat.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Maximilian Attems <max@stro.at>
Cc: Michal Marek <mmarek@suse.cz>
Cc: Paul Bolle <pebolle@tiscali.nl>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Geoff Levand 2015-02-17 13:45:56 -08:00 committed by Linus Torvalds
parent 518a0c7163
commit cf2df6396b
1 changed files with 15 additions and 4 deletions
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19
include/linux/kexec.h
View file

@ -1,6 +1,18 @@
#ifndef LINUX_KEXEC_H
#define LINUX_KEXEC_H
#define IND_DESTINATION_BIT 0
#define IND_INDIRECTION_BIT 1
#define IND_DONE_BIT 2
#define IND_SOURCE_BIT 3
#define IND_DESTINATION (1 << IND_DESTINATION_BIT)
#define IND_INDIRECTION (1 << IND_INDIRECTION_BIT)
#define IND_DONE (1 << IND_DONE_BIT)
#define IND_SOURCE (1 << IND_SOURCE_BIT)
#if !defined(__ASSEMBLY__)
#include <uapi/linux/kexec.h>
#ifdef CONFIG_KEXEC
@ -64,10 +76,6 @@
*/
typedef unsigned long kimage_entry_t;
#define IND_DESTINATION 0x1
#define IND_INDIRECTION 0x2
#define IND_DONE 0x4
#define IND_SOURCE 0x8
struct kexec_segment {
/*
@ -311,4 +319,7 @@ struct task_struct;
static inline void crash_kexec(struct pt_regs *regs) { }
static inline int kexec_should_crash(struct task_struct *p) { return 0; }
#endif /* CONFIG_KEXEC */
#endif /* !defined(__ASSEBMLY__) */
#endif /* LINUX_KEXEC_H */