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crash_dump: Make elfcorehdr address/size symbols always visible 

Make the forward declarations of elfcorehdr_addr and elfcorehdr_size,
and the definitions of ELFCORE_ADDR_MAX and ELFCORE_ADDR_ERR always
available, like is done for phys_initrd_start and phys_initrd_size.
Code referring to these symbols can then just check for
IS_ENABLED(CONFIG_CRASH_DUMP), instead of requiring conditional
compilation using an #ifdef, thus preparing to increase compile
coverage.

Suggested-by: Rob Herring <robh+dt@kernel.org>
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/ba965ca613c0cc82c1ec2fe353ee34fb13b36474.1628670468.git.geert+renesas@glider.be
This commit is contained in:
Geert Uytterhoeven 2021-08-11 10:51:00 +02:00 committed by Rob Herring
parent 0b3813014c
commit 3370941301
1 changed files with 2 additions and 1 deletions
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3
include/linux/crash_dump.h
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@ -10,13 +10,14 @@
#include <linux/pgtable.h> /* for pgprot_t */
#ifdef CONFIG_CRASH_DUMP
/* For IS_ENABLED(CONFIG_CRASH_DUMP) */
#define ELFCORE_ADDR_MAX (-1ULL)
#define ELFCORE_ADDR_ERR (-2ULL)
extern unsigned long long elfcorehdr_addr;
extern unsigned long long elfcorehdr_size;
#ifdef CONFIG_CRASH_DUMP
extern int elfcorehdr_alloc(unsigned long long *addr, unsigned long long *size);
extern void elfcorehdr_free(unsigned long long addr);
extern ssize_t elfcorehdr_read(char *buf, size_t count, u64 *ppos);