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authorSuresh Siddha <suresh.b.siddha@intel.com>2008-05-23 16:26:37 -0700
committerThomas Gleixner <tglx@linutronix.de>2008-06-04 13:11:46 +0200
commite8a496ac8cd00cabbdaa373db4818a9ad19a1c5a (patch)
tree8792b784e54982decd56a29acb02f63ce62a03ab /arch/x86/math-emu
parent5c1ea08215f1f830dfaf4819a5f22efca41c3832 (diff)
downloadop-kernel-dev-e8a496ac8cd00cabbdaa373db4818a9ad19a1c5a.zip
op-kernel-dev-e8a496ac8cd00cabbdaa373db4818a9ad19a1c5a.tar.gz
x86: fix broken math-emu with lazy allocation of fpu area
Fix the math emulation that got broken with the recent lazy allocation of FPU area. init_fpu() need to be added for the math-emulation path aswell for the FPU area allocation. math emulation enabled kernel booted fine with this, in the presence of "no387 nofxsr" boot param. Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com> Cc: hpa@zytor.com Cc: mingo@elte.hu Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch/x86/math-emu')
-rw-r--r--arch/x86/math-emu/fpu_entry.c13
1 files changed, 8 insertions, 5 deletions
diff --git a/arch/x86/math-emu/fpu_entry.c b/arch/x86/math-emu/fpu_entry.c
index 6e38d87..c7b06fe 100644
--- a/arch/x86/math-emu/fpu_entry.c
+++ b/arch/x86/math-emu/fpu_entry.c
@@ -30,6 +30,7 @@
#include <asm/uaccess.h>
#include <asm/desc.h>
#include <asm/user.h>
+#include <asm/i387.h>
#include "fpu_system.h"
#include "fpu_emu.h"
@@ -146,6 +147,13 @@ asmlinkage void math_emulate(long arg)
unsigned long code_limit = 0; /* Initialized to stop compiler warnings */
struct desc_struct code_descriptor;
+ if (!used_math()) {
+ if (init_fpu(current)) {
+ do_group_exit(SIGKILL);
+ return;
+ }
+ }
+
#ifdef RE_ENTRANT_CHECKING
if (emulating) {
printk("ERROR: wm-FPU-emu is not RE-ENTRANT!\n");
@@ -153,11 +161,6 @@ asmlinkage void math_emulate(long arg)
RE_ENTRANT_CHECK_ON;
#endif /* RE_ENTRANT_CHECKING */
- if (!used_math()) {
- finit();
- set_used_math();
- }
-
SETUP_DATA_AREA(arg);
FPU_ORIG_EIP = FPU_EIP;
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