diff options
| author | Maciej W. Rozycki <macro@linux-mips.org> | 2015-05-12 15:20:57 +0100 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2015-05-12 23:15:49 +0200 |
| commit | 03dce595270f22d59a6f37e9170287c1afd94bc2 (patch) | |
| tree | 68e8ae5e92d6dda9b32be45d72025b095913671d /arch/mips/include | |
| parent | 620b155034570f577470cf5309f741bac6a6e32b (diff) | |
MIPS: Fix a preemption issue with thread's FPU defaults
Fix "BUG: using smp_processor_id() in preemptible" reported in accesses
to thread's FPU defaults: the value to initialise FSCR to at program
startup, the FCSR r/w mask and the contents of FIR in full FPU
emulation, removing a regression introduced with 9b26616c [MIPS: Respect
the ISA level in FCSR handling] and f6843626 [MIPS: math-emu: Set FIR
feature flags for full emulation].
Use `boot_cpu_data' to obtain the data from, following the approach that
`cpu_has_*' macros take and avoiding the call to `smp_processor_id' made
in the reference to `current_cpu_data'. The contents of FSCR have to be
consistent across processors in an SMP system, the settings there must
not change as a thread is migrated across processors. And the contents
of FIR are guaranteed to be consistent in FPU emulation, by definition.
Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Tested-by: Ezequiel Garcia <ezequiel.garcia@imgtec.com>
Tested-by: Paul Martin <paul.martin@codethink.co.uk>
Cc: Markos Chandras <Markos.Chandras@imgtec.com>
Cc: James Hogan <james.hogan@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/10030/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/include')
| -rw-r--r-- | arch/mips/include/asm/elf.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/mips/include/asm/elf.h b/arch/mips/include/asm/elf.h index a594d8ed9698..f19e890b99d2 100644 --- a/arch/mips/include/asm/elf.h +++ b/arch/mips/include/asm/elf.h @@ -304,7 +304,7 @@ do { \ \ current->thread.abi = &mips_abi; \ \ - current->thread.fpu.fcr31 = current_cpu_data.fpu_csr31; \ + current->thread.fpu.fcr31 = boot_cpu_data.fpu_csr31; \ } while (0) #endif /* CONFIG_32BIT */ @@ -366,7 +366,7 @@ do { \ else \ current->thread.abi = &mips_abi; \ \ - current->thread.fpu.fcr31 = current_cpu_data.fpu_csr31; \ + current->thread.fpu.fcr31 = boot_cpu_data.fpu_csr31; \ \ p = personality(current->personality); \ if (p != PER_LINUX32 && p != PER_LINUX) \ |