xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Merge branch 'master' into sh/hw-breakpoints

Browse Source 
Conflict between FPU thread flag migration and debug
thread flag addition.

Conflicts:
	arch/sh/include/asm/thread_info.h
	arch/sh/include/asm/ubc.h
	arch/sh/kernel/process_32.c
This commit is contained in:
Paul Mundt
2009-12-08 15:47:12 +09:00
parent 09a0729477 6a5a0b9139
commit 6424db52e2
146 changed files with 4774 additions and 2437 deletions
Download Patch File Download Diff File Expand all files Collapse all files

43
arch/sh/kernel/process_32.c
View File

@@ -133,7 +133,10 @@ int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
regs.regs[5] = (unsigned long)fn;
regs.pc = (unsigned long)kernel_thread_helper;
regs.sr = (1 << 30);
regs.sr = SR_MD;
#if defined(CONFIG_SH_FPU)
regs.sr |= SR_FD;
#endif
/* Ok, create the new process.. */
pid = do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0,
@@ -141,6 +144,7 @@ int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
return pid;
}
EXPORT_SYMBOL(kernel_thread);
/*
* Free current thread data structures etc..
@@ -184,6 +188,16 @@ int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu)
return fpvalid;
}
EXPORT_SYMBOL(dump_fpu);
/*
* This gets called before we allocate a new thread and copy
* the current task into it.
*/
void prepare_to_copy(struct task_struct *tsk)
{
unlazy_fpu(tsk, task_pt_regs(tsk));
}
asmlinkage void ret_from_fork(void);
@@ -193,15 +207,10 @@ int copy_thread(unsigned long clone_flags, unsigned long usp,
{
struct thread_info *ti = task_thread_info(p);
struct pt_regs *childregs;
struct task_struct *tsk = current;
#if defined(CONFIG_SH_FPU)
unlazy_fpu(tsk, regs);
p->thread.fpu = tsk->thread.fpu;
copy_to_stopped_child_used_math(p);
#endif
#if defined(CONFIG_SH_DSP)
struct task_struct *tsk = current;
if (is_dsp_enabled(tsk)) {
/* We can use the __save_dsp or just copy the struct:
* __save_dsp(p);
@@ -220,6 +229,8 @@ int copy_thread(unsigned long clone_flags, unsigned long usp,
} else {
childregs->regs[15] = (unsigned long)childregs;
ti->addr_limit = KERNEL_DS;
ti->status &= ~TS_USEDFPU;
p->fpu_counter = 0;
}
if (clone_flags & CLONE_SETTLS)
@@ -242,9 +253,13 @@ int copy_thread(unsigned long clone_flags, unsigned long usp,
__notrace_funcgraph struct task_struct *
__switch_to(struct task_struct *prev, struct task_struct *next)
{
#if defined(CONFIG_SH_FPU)
struct thread_struct *next_t = &next->thread;
unlazy_fpu(prev, task_pt_regs(prev));
#endif
/* we're going to use this soon, after a few expensive things */
if (next->fpu_counter > 5)
prefetch(&next_t->fpu.hard);
#ifdef CONFIG_MMU
/*
@@ -256,6 +271,14 @@ __switch_to(struct task_struct *prev, struct task_struct *next)
: "r" (task_thread_info(next)));
#endif
/*
* If the task has used fpu the last 5 timeslices, just do a full
* restore of the math state immediately to avoid the trap; the
* chances of needing FPU soon are obviously high now
*/
if (next->fpu_counter > 5)
fpu_state_restore(task_pt_regs(next));
return prev;
}