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elfcore: fix building with clang

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kernel/elfcore.c only contains weak symbols, which triggers a bug with
clang in combination with recordmcount:

  Cannot find symbol for section 2: .text.
  kernel/elfcore.o: failed

Move the empty stubs into linux/elfcore.h as inline functions.  As only
two architectures use these, just use the architecture specific Kconfig
symbols to key off the declaration.

Link: https://lkml.kernel.org/r/20201204165742.3815221-2-arnd@kernel.org
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Nathan Chancellor <natechancellor@gmail.com>
Cc: Nick Desaulniers <ndesaulniers@google.com>
Cc: Barret Rhoden <brho@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Arnd Bergmann 2020-12-11 13:36:46 -08:00 • committed by Linus Torvalds
parent 55d5b7dd64
commit 6e7b64b9dd
3 changed files with 22 additions and 27 deletions
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22
include/linux/elfcore.h
View file

@ -104,6 +104,7 @@ static inline int elf_core_copy_task_fpregs(struct task_struct *t, struct pt_reg
#endif #endif
} }
#if defined(CONFIG_UM) || defined(CONFIG_IA64)
/* /*
* These functions parameterize elf_core_dump in fs/binfmt_elf.c to write out * These functions parameterize elf_core_dump in fs/binfmt_elf.c to write out
* extra segments containing the gate DSO contents. Dumping its * extra segments containing the gate DSO contents. Dumping its
@ -118,5 +119,26 @@ elf_core_write_extra_phdrs(struct coredump_params *cprm, loff_t offset);
extern int extern int
elf_core_write_extra_data(struct coredump_params *cprm); elf_core_write_extra_data(struct coredump_params *cprm);
extern size_t elf_core_extra_data_size(void); extern size_t elf_core_extra_data_size(void);
#else
static inline Elf_Half elf_core_extra_phdrs(void)
{
return 0;
}
static inline int elf_core_write_extra_phdrs(struct coredump_params *cprm, loff_t offset)
{
return 1;
}
static inline int elf_core_write_extra_data(struct coredump_params *cprm)
{
return 1;
}
static inline size_t elf_core_extra_data_size(void)
{
return 0;
}
#endif
#endif /* _LINUX_ELFCORE_H */ #endif /* _LINUX_ELFCORE_H */

1
kernel/Makefile
View file

@ -97,7 +97,6 @@ obj-$(CONFIG_TASK_DELAY_ACCT) += delayacct.o
obj-$(CONFIG_TASKSTATS) += taskstats.o tsacct.o obj-$(CONFIG_TASKSTATS) += taskstats.o tsacct.o
obj-$(CONFIG_TRACEPOINTS) += tracepoint.o obj-$(CONFIG_TRACEPOINTS) += tracepoint.o
obj-$(CONFIG_LATENCYTOP) += latencytop.o obj-$(CONFIG_LATENCYTOP) += latencytop.o
obj-$(CONFIG_ELFCORE) += elfcore.o
obj-$(CONFIG_FUNCTION_TRACER) += trace/ obj-$(CONFIG_FUNCTION_TRACER) += trace/
obj-$(CONFIG_TRACING) += trace/ obj-$(CONFIG_TRACING) += trace/
obj-$(CONFIG_TRACE_CLOCK) += trace/ obj-$(CONFIG_TRACE_CLOCK) += trace/

26
kernel/elfcore.c
View file

@ -1,26 +0,0 @@
// SPDX-License-Identifier: GPL-2.0
#include <linux/elf.h>
#include <linux/fs.h>
#include <linux/mm.h>
#include <linux/binfmts.h>
#include <linux/elfcore.h>
Elf_Half __weak elf_core_extra_phdrs(void)
{
return 0;
}
int __weak elf_core_write_extra_phdrs(struct coredump_params *cprm, loff_t offset)
{
return 1;
}
int __weak elf_core_write_extra_data(struct coredump_params *cprm)
{
return 1;
}
size_t __weak elf_core_extra_data_size(void)
{
return 0;
}