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b89f306839
The no-op cases of cop2_save & cop2_restore lead to the following
warnings being emitted during build with recent versions of gcc (tested
using gcc 4.8.3 from the Mentor Sourcery CodeBench 2014.05 toolchain):
In file included from ./arch/mips/include/asm/switch_to.h:18:0,
from kernel/sched/core.c:78:
kernel/sched/core.c: In function 'finish_task_switch':
include/asm-generic/current.h:6:45: warning: value computed is not used [-Wunused-value]
#define get_current() (current_thread_info()->task)
^
./arch/mips/include/asm/cop2.h:48:32: note: in definition of macro 'cop2_restore'
#define cop2_restore(r) do { (r); } while (0)
^
include/asm-generic/current.h:7:17: note: in expansion of macro 'get_current'
#define current get_current()
^
./arch/mips/include/asm/switch_to.h:114:16: note: in expansion of macro 'current'
cop2_restore(current); \
^
kernel/sched/core.c:2225:2: note: in expansion of macro 'finish_arch_switch'
finish_arch_switch(prev);
^
Avoid the warning by "using" the value by casting to void.
Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/7880/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
73 lines
1.8 KiB
C
73 lines
1.8 KiB
C
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 2009 Wind River Systems,
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* written by Ralf Baechle <ralf@linux-mips.org>
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*/
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#ifndef __ASM_COP2_H
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#define __ASM_COP2_H
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#include <linux/notifier.h>
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#if defined(CONFIG_CPU_CAVIUM_OCTEON)
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extern void octeon_cop2_save(struct octeon_cop2_state *);
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extern void octeon_cop2_restore(struct octeon_cop2_state *);
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#define cop2_save(r) octeon_cop2_save(&(r)->thread.cp2)
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#define cop2_restore(r) octeon_cop2_restore(&(r)->thread.cp2)
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#define cop2_present 1
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#define cop2_lazy_restore 1
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#elif defined(CONFIG_CPU_XLP)
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extern void nlm_cop2_save(struct nlm_cop2_state *);
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extern void nlm_cop2_restore(struct nlm_cop2_state *);
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#define cop2_save(r) nlm_cop2_save(&(r)->thread.cp2)
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#define cop2_restore(r) nlm_cop2_restore(&(r)->thread.cp2)
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#define cop2_present 1
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#define cop2_lazy_restore 0
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#elif defined(CONFIG_CPU_LOONGSON3)
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#define cop2_present 1
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#define cop2_lazy_restore 1
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#define cop2_save(r) do { (void)(r); } while (0)
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#define cop2_restore(r) do { (void)(r); } while (0)
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#else
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#define cop2_present 0
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#define cop2_lazy_restore 0
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#define cop2_save(r) do { (void)(r); } while (0)
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#define cop2_restore(r) do { (void)(r); } while (0)
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#endif
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enum cu2_ops {
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CU2_EXCEPTION,
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CU2_LWC2_OP,
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CU2_LDC2_OP,
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CU2_SWC2_OP,
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CU2_SDC2_OP,
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};
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extern int register_cu2_notifier(struct notifier_block *nb);
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extern int cu2_notifier_call_chain(unsigned long val, void *v);
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#define cu2_notifier(fn, pri) \
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({ \
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static struct notifier_block fn##_nb = { \
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.notifier_call = fn, \
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.priority = pri \
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}; \
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\
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register_cu2_notifier(&fn##_nb); \
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})
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#endif /* __ASM_COP2_H */
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