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authorPaul Mundt <lethal@linux-sh.org>2010-01-13 06:51:40 +0300
committerPaul Mundt <lethal@linux-sh.org>2010-01-13 06:51:40 +0300
commit0ea820cf9bf58f735ed40ec67947159c4f170012 (patch)
tree77320006b4dded5804c678c1a869571be5c0b95f /arch/sh/kernel/process_32.c
parenta3705799e2cc5fb69d88ad6a7f317a8f5597f18d (diff)
downloadlinux-0ea820cf9bf58f735ed40ec67947159c4f170012.tar.xz
sh: Move over to dynamically allocated FPU context.
This follows the x86 xstate changes and implements a task_xstate slab cache that is dynamically sized to match one of hard FP/soft FP/FPU-less. This also tidies up and consolidates some of the SH-2A/SH-4 FPU fragmentation. Now fpu state restorers are commonly defined, with the init_fpu()/fpu_init() mess reworked to follow the x86 convention. The fpu_init() register initialization has been replaced by xstate setup followed by writing out to hardware via the standard restore path. As init_fpu() now performs a slab allocation a secondary lighterweight restorer is also introduced for the context switch. In the future the DSP state will be rolled in here, too. More work remains for math emulation and the SH-5 FPU, which presently uses its own special (UP-only) interfaces. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'arch/sh/kernel/process_32.c')
-rw-r--r--arch/sh/kernel/process_32.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/arch/sh/kernel/process_32.c b/arch/sh/kernel/process_32.c
index c4361402ec5e..03de6573aa76 100644
--- a/arch/sh/kernel/process_32.c
+++ b/arch/sh/kernel/process_32.c
@@ -156,6 +156,8 @@ void start_thread(struct pt_regs *regs, unsigned long new_pc,
regs->sr = SR_FD;
regs->pc = new_pc;
regs->regs[15] = new_sp;
+
+ free_thread_xstate(current);
}
EXPORT_SYMBOL(start_thread);
@@ -316,7 +318,7 @@ __switch_to(struct task_struct *prev, struct task_struct *next)
/* we're going to use this soon, after a few expensive things */
if (next->fpu_counter > 5)
- prefetch(&next_t->fpu.hard);
+ prefetch(next_t->xstate);
#ifdef CONFIG_MMU
/*
@@ -353,7 +355,7 @@ __switch_to(struct task_struct *prev, struct task_struct *next)
* chances of needing FPU soon are obviously high now
*/
if (next->fpu_counter > 5)
- fpu_state_restore(task_pt_regs(next));
+ __fpu_state_restore();
return prev;
}