mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-22 18:44:44 +08:00
4603f53a1d
The __cpuinit type of throwaway sections might have made sense
some time ago when RAM was more constrained, but now the savings
do not offset the cost and complications. For example, the fix in
commit 5e427ec2d0 ("x86: Fix bit corruption at CPU resume time")
is a good example of the nasty type of bugs that can be created
with improper use of the various __init prefixes.
After a discussion on LKML[1] it was decided that cpuinit should go
the way of devinit and be phased out. Once all the users are gone,
we can then finally remove the macros themselves from linux/init.h.
Note that some harmless section mismatch warnings may result, since
notify_cpu_starting() and cpu_up() are arch independent (kernel/cpu.c)
are flagged as __cpuinit -- so if we remove the __cpuinit from
arch specific callers, we will also get section mismatch warnings.
As an intermediate step, we intend to turn the linux/init.h cpuinit
content into no-ops as early as possible, since that will get rid
of these warnings. In any case, they are temporary and harmless.
This removes all the arch/sh uses of the __cpuinit macros from
all C files. Currently sh does not have any __CPUINIT used in
assembly files.
[1] https://lkml.org/lkml/2013/5/20/589
Cc: Paul Mundt <lethal@linux-sh.org>
Cc: linux-sh@vger.kernel.org
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
77 lines
1.6 KiB
C
77 lines
1.6 KiB
C
#include <linux/mm.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/export.h>
|
|
#include <linux/stackprotector.h>
|
|
#include <asm/fpu.h>
|
|
|
|
struct kmem_cache *task_xstate_cachep = NULL;
|
|
unsigned int xstate_size;
|
|
|
|
#ifdef CONFIG_CC_STACKPROTECTOR
|
|
unsigned long __stack_chk_guard __read_mostly;
|
|
EXPORT_SYMBOL(__stack_chk_guard);
|
|
#endif
|
|
|
|
/*
|
|
* this gets called so that we can store lazy state into memory and copy the
|
|
* current task into the new thread.
|
|
*/
|
|
int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
|
|
{
|
|
#ifdef CONFIG_SUPERH32
|
|
unlazy_fpu(src, task_pt_regs(src));
|
|
#endif
|
|
*dst = *src;
|
|
|
|
if (src->thread.xstate) {
|
|
dst->thread.xstate = kmem_cache_alloc(task_xstate_cachep,
|
|
GFP_KERNEL);
|
|
if (!dst->thread.xstate)
|
|
return -ENOMEM;
|
|
memcpy(dst->thread.xstate, src->thread.xstate, xstate_size);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
void free_thread_xstate(struct task_struct *tsk)
|
|
{
|
|
if (tsk->thread.xstate) {
|
|
kmem_cache_free(task_xstate_cachep, tsk->thread.xstate);
|
|
tsk->thread.xstate = NULL;
|
|
}
|
|
}
|
|
|
|
void arch_release_task_struct(struct task_struct *tsk)
|
|
{
|
|
free_thread_xstate(tsk);
|
|
}
|
|
|
|
void arch_task_cache_init(void)
|
|
{
|
|
if (!xstate_size)
|
|
return;
|
|
|
|
task_xstate_cachep = kmem_cache_create("task_xstate", xstate_size,
|
|
__alignof__(union thread_xstate),
|
|
SLAB_PANIC | SLAB_NOTRACK, NULL);
|
|
}
|
|
|
|
#ifdef CONFIG_SH_FPU_EMU
|
|
# define HAVE_SOFTFP 1
|
|
#else
|
|
# define HAVE_SOFTFP 0
|
|
#endif
|
|
|
|
void init_thread_xstate(void)
|
|
{
|
|
if (boot_cpu_data.flags & CPU_HAS_FPU)
|
|
xstate_size = sizeof(struct sh_fpu_hard_struct);
|
|
else if (HAVE_SOFTFP)
|
|
xstate_size = sizeof(struct sh_fpu_soft_struct);
|
|
else
|
|
xstate_size = 0;
|
|
}
|