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authorAtsushi Nemoto <anemo@mba.ocn.ne.jp>2007-04-16 10:19:44 -0400
committerRalf Baechle <ralf@linux-mips.org>2007-04-20 09:58:37 -0400
commitfaea62346444ce5b1dba8fb5291d95b676522c42 (patch)
treed00e53763ca9b145348e5754aaf0cd4dcbb12123 /include
parent5323180db75d562a287cb2020b07c9422df13df6 (diff)
[MIPS] Retry {save,restore}_fp_context if failed in atomic context.
The save_fp_context()/restore_fp_context() might sleep on accessing user stack and therefore might lose FPU ownership in middle of them. If these function failed due to "in_atomic" test in do_page_fault, touch the sigcontext area in non-atomic context and retry these save/restore operation. This is a replacement of a (broken) fix which was titled "Allow CpU exception in kernel partially". Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'include')
-rw-r--r--include/asm-mips/fpu.h9
1 files changed, 7 insertions, 2 deletions
diff --git a/include/asm-mips/fpu.h b/include/asm-mips/fpu.h
index 71436f90203f..b414a7d9db43 100644
--- a/include/asm-mips/fpu.h
+++ b/include/asm-mips/fpu.h
@@ -100,14 +100,19 @@ static inline void __own_fpu(void)
100 set_thread_flag(TIF_USEDFPU); 100 set_thread_flag(TIF_USEDFPU);
101} 101}
102 102
103static inline void own_fpu(int restore) 103static inline void own_fpu_inatomic(int restore)
104{ 104{
105 preempt_disable();
106 if (cpu_has_fpu && !__is_fpu_owner()) { 105 if (cpu_has_fpu && !__is_fpu_owner()) {
107 __own_fpu(); 106 __own_fpu();
108 if (restore) 107 if (restore)
109 _restore_fp(current); 108 _restore_fp(current);
110 } 109 }
110}
111
112static inline void own_fpu(int restore)
113{
114 preempt_disable();
115 own_fpu_inatomic(restore);
111 preempt_enable(); 116 preempt_enable();
112} 117}
113 118