ff2c8252bf
smp_ops providers do not modify their ops structures, so they should be made const for robustness. Since currently the MIPS kernel is not mapped with memory protection, this does not in itself provide any security benefit, but it still makes sense to make this change. There are also slight code size efficincies from the structure being made read-only, saving 128 bytes of kernel text on a pistachio_defconfig. Before: text data bss dec hex filename 7187239 1772752 470224 9430215 8fe4c7 vmlinux After: text data bss dec hex filename 7187111 1772752 470224 9430087 8fe447 vmlinux Signed-off-by: Matt Redfearn <matt.redfearn@imgtec.com> Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Marcin Nowakowski <marcin.nowakowski@imgtec.com> Cc: Bart Van Assche <bart.vanassche@sandisk.com> Cc: Masahiro Yamada <yamada.masahiro@socionext.com> Cc: Huacai Chen <chenhc@lemote.com> Cc: Paul Gortmaker <paul.gortmaker@windriver.com> Cc: Kevin Cernekee <cernekee@gmail.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Doug Ledford <dledford@redhat.com> Cc: James Hogan <james.hogan@imgtec.com> Cc: Joe Perches <joe@perches.com> Cc: Florian Fainelli <f.fainelli@gmail.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Paul Burton <paul.burton@imgtec.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Steven J. Hill <steven.hill@cavium.com> Cc: linux-mips@linux-mips.org Cc: linux-kernel@vger.kernel.org Patchwork: https://patchwork.linux-mips.org/patch/16784/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
118 lines
2.3 KiB
C
118 lines
2.3 KiB
C
/*
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* This file is subject to the terms and conditions of the GNU General
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* Public License. See the file "COPYING" in the main directory of this
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* archive for more details.
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*
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* Copyright (C) 2000 - 2001 by Kanoj Sarcar (kanoj@sgi.com)
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* Copyright (C) 2000 - 2001 by Silicon Graphics, Inc.
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* Copyright (C) 2000, 2001, 2002 Ralf Baechle
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* Copyright (C) 2000, 2001 Broadcom Corporation
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*/
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#ifndef __ASM_SMP_OPS_H
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#define __ASM_SMP_OPS_H
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#include <linux/errno.h>
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#include <asm/mips-cm.h>
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#ifdef CONFIG_SMP
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#include <linux/cpumask.h>
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struct task_struct;
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struct plat_smp_ops {
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void (*send_ipi_single)(int cpu, unsigned int action);
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void (*send_ipi_mask)(const struct cpumask *mask, unsigned int action);
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void (*init_secondary)(void);
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void (*smp_finish)(void);
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void (*boot_secondary)(int cpu, struct task_struct *idle);
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void (*smp_setup)(void);
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void (*prepare_cpus)(unsigned int max_cpus);
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#ifdef CONFIG_HOTPLUG_CPU
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int (*cpu_disable)(void);
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void (*cpu_die)(unsigned int cpu);
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#endif
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};
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extern void register_smp_ops(const struct plat_smp_ops *ops);
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static inline void plat_smp_setup(void)
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{
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extern const struct plat_smp_ops *mp_ops; /* private */
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mp_ops->smp_setup();
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}
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extern void mips_smp_send_ipi_single(int cpu, unsigned int action);
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extern void mips_smp_send_ipi_mask(const struct cpumask *mask,
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unsigned int action);
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#else /* !CONFIG_SMP */
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struct plat_smp_ops;
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static inline void plat_smp_setup(void)
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{
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/* UP, nothing to do ... */
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}
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static inline void register_smp_ops(const struct plat_smp_ops *ops)
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{
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}
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#endif /* !CONFIG_SMP */
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static inline int register_up_smp_ops(void)
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{
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#ifdef CONFIG_SMP_UP
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extern const struct plat_smp_ops up_smp_ops;
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register_smp_ops(&up_smp_ops);
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return 0;
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#else
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return -ENODEV;
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#endif
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}
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static inline int register_cmp_smp_ops(void)
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{
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#ifdef CONFIG_MIPS_CMP
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extern const struct plat_smp_ops cmp_smp_ops;
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if (!mips_cm_present())
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return -ENODEV;
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register_smp_ops(&cmp_smp_ops);
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return 0;
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#else
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return -ENODEV;
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#endif
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}
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static inline int register_vsmp_smp_ops(void)
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{
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#ifdef CONFIG_MIPS_MT_SMP
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extern const struct plat_smp_ops vsmp_smp_ops;
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register_smp_ops(&vsmp_smp_ops);
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return 0;
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#else
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return -ENODEV;
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#endif
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}
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#ifdef CONFIG_MIPS_CPS
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extern int register_cps_smp_ops(void);
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#else
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static inline int register_cps_smp_ops(void)
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{
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return -ENODEV;
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}
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#endif
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#endif /* __ASM_SMP_OPS_H */
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