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| author | Suresh Siddha <suresh.b.siddha@intel.com> | 2008-05-23 16:26:37 -0700 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2008-06-04 13:11:46 +0200 |
| commit | e8a496ac8cd00cabbdaa373db4818a9ad19a1c5a (patch) | |
| tree | 8792b784e54982decd56a29acb02f63ce62a03ab /arch/x86/math-emu | |
| parent | 5c1ea08215f1f830dfaf4819a5f22efca41c3832 (diff) | |
| download | linux-e8a496ac8cd00cabbdaa373db4818a9ad19a1c5a.tar.gz linux-e8a496ac8cd00cabbdaa373db4818a9ad19a1c5a.tar.bz2 linux-e8a496ac8cd00cabbdaa373db4818a9ad19a1c5a.zip | |
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.c | 13 |
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 6e38d877ea77..c7b06feb139b 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; |