* [PATCH] mn10300: fix build error of missing fpu_save()
@ 2017-01-20 0:58 Randy Dunlap
2017-01-23 23:26 ` David Howells
0 siblings, 1 reply; 2+ messages in thread
From: Randy Dunlap @ 2017-01-20 0:58 UTC (permalink / raw)
To: LKML, Andrew Morton, David Howells, linux-am33-list; +Cc: kbuild test robot
I have 21 occurrences of kbuild test robot reporting this build failure
over more than one year and zero (0) attempts to fix it. I have 2 alternate
(untested) fixes for it. (If either of them causes a build error, it should
be simple to fix and I will do so.)
a. #include <asm/fpu.h> in <asm/switch_to.h> so that empty fpu_save() is
visible
b. make <asm/switch_to.h> know about CONFIG_FPU not enabled
David, which one do you prefer?
Fengguang, it's allnoconfig => CONFIG_FPU=n that causes this build error.
----- a.-----
From: Randy Dunlap <rdunlap@infradead.org>
When CONFIG_FPU is not enabled on arch/mn10300, <asm/switch_to.h>
causes a build error with a call to fpu_save():
kernel/built-in.o: In function `.L410':
core.c:(.sched.text+0x28a): undefined reference to `fpu_save'
Fix this by including <asm/fpu.h> in <asm/switch_to.h> so that
an empty static inline fpu_save() is defined.
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Reported-by: kbuild test robot <fengguang.wu@intel.com>
Cc: David Howells <dhowells@redhat.com>
---
arch/mn10300/include/asm/switch_to.h | 1 +
1 file changed, 1 insertion(+)
--- lnx-410-rc4.orig/arch/mn10300/include/asm/switch_to.h
+++ lnx-410-rc4/arch/mn10300/include/asm/switch_to.h
@@ -12,6 +12,7 @@
#define _ASM_SWITCH_TO_H
#include <asm/barrier.h>
+#include <asm/fpu.h>
struct task_struct;
struct thread_struct;
-----or b.-----
From: Randy Dunlap <rdunlap@infradead.org>
When CONFIG_FPU is not enabled on arch/mn10300, <asm/switch_to.h>
causes a build error with a call to fpu_save():
kernel/built-in.o: In function `.L410':
core.c:(.sched.text+0x28a): undefined reference to `fpu_save'
Fix this by defining switch_fpu() in <asm/switch_to.h> only when
CONFIG_FPU is enabled.
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Reported-by: kbuild test robot <fengguang.wu@intel.com>
Cc: David Howells <dhowells@redhat.com>
---
arch/mn10300/include/asm/switch_to.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- lnx-410-rc4.orig/arch/mn10300/include/asm/switch_to.h
+++ lnx-410-rc4/arch/mn10300/include/asm/switch_to.h
@@ -16,7 +16,7 @@
struct task_struct;
struct thread_struct;
-#if !defined(CONFIG_LAZY_SAVE_FPU)
+#if defined(CONFIG_FPU) && !defined(CONFIG_LAZY_SAVE_FPU)
struct fpu_state_struct;
extern asmlinkage void fpu_save(struct fpu_state_struct *);
#define switch_fpu(prev, next) \
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [PATCH] mn10300: fix build error of missing fpu_save()
2017-01-20 0:58 [PATCH] mn10300: fix build error of missing fpu_save() Randy Dunlap
@ 2017-01-23 23:26 ` David Howells
0 siblings, 0 replies; 2+ messages in thread
From: David Howells @ 2017-01-23 23:26 UTC (permalink / raw)
To: Randy Dunlap
Cc: dhowells, LKML, Andrew Morton, linux-am33-list, kbuild test robot
Randy Dunlap <rdunlap@infradead.org> wrote:
> b. make <asm/switch_to.h> know about CONFIG_FPU not enabled
>
> David, which one do you prefer?
b.
> From: Randy Dunlap <rdunlap@infradead.org>
>
> When CONFIG_FPU is not enabled on arch/mn10300, <asm/switch_to.h>
> causes a build error with a call to fpu_save():
>
> kernel/built-in.o: In function `.L410':
> core.c:(.sched.text+0x28a): undefined reference to `fpu_save'
>
> Fix this by defining switch_fpu() in <asm/switch_to.h> only when
> CONFIG_FPU is enabled.
>
> Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
> Reported-by: kbuild test robot <fengguang.wu@intel.com>
> Cc: David Howells <dhowells@redhat.com>
> ---
> arch/mn10300/include/asm/switch_to.h | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> --- lnx-410-rc4.orig/arch/mn10300/include/asm/switch_to.h
> +++ lnx-410-rc4/arch/mn10300/include/asm/switch_to.h
> @@ -16,7 +16,7 @@
> struct task_struct;
> struct thread_struct;
>
> -#if !defined(CONFIG_LAZY_SAVE_FPU)
> +#if defined(CONFIG_FPU) && !defined(CONFIG_LAZY_SAVE_FPU)
> struct fpu_state_struct;
> extern asmlinkage void fpu_save(struct fpu_state_struct *);
> #define switch_fpu(prev, next) \
Reviewed-by: David Howells <dhowells@redhat.com>
^ permalink raw reply [flat|nested] 2+ messages in thread
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2017-01-23 23:26 ` David Howells
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