MIPS: Correct the 64-bit DSP accumulator register size

commit f5958b4cf4fc38ed4583ab83fb7c4cd1ab05f47b upstream.

Use the `unsigned long' rather than `__u32' type for DSP accumulator
registers, like with the regular MIPS multiply/divide accumulator and
general-purpose registers, as all are 64-bit in 64-bit implementations
and using a 32-bit data type leads to contents truncation on context
saving.

Update `arch_ptrace' and `compat_arch_ptrace' accordingly, removing
casts that are similarly not used with multiply/divide accumulator or
general-purpose register accesses.

Signed-off-by: Maciej W. Rozycki <macro@mips.com>
Signed-off-by: Paul Burton <paul.burton@mips.com>
Fixes: e50c0a8fa60d ("Support the MIPS32 / MIPS64 DSP ASE.")
Patchwork: https://patchwork.linux-mips.org/patch/19329/
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: James Hogan <jhogan@kernel.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-fsdevel@vger.kernel.org
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Cc: stable@vger.kernel.org # 2.6.15+
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/mips/include/asm/processor.h b/arch/mips/include/asm/processor.h
index 95b8c47..c847f47 100644 (file)
--- a/arch/mips/include/asm/processor.h
+++ b/arch/mips/include/asm/processor.h
@@ -141,7 +141,7 @@ struct mips_fpu_struct {
 
 #define NUM_DSP_REGS   6
 
-typedef __u32 dspreg_t;
+typedef unsigned long dspreg_t;
 
 struct mips_dsp_state {
        dspreg_t        dspr[NUM_DSP_REGS];

diff --git a/arch/mips/kernel/ptrace.c b/arch/mips/kernel/ptrace.c
index e058cd3..efffdf2 100644 (file)
--- a/arch/mips/kernel/ptrace.c
+++ b/arch/mips/kernel/ptrace.c
@@ -847,7 +847,7 @@ long arch_ptrace(struct task_struct *child, long request,
                                goto out;
                        }
                        dregs = __get_dsp_regs(child);
-                       tmp = (unsigned long) (dregs[addr - DSP_BASE]);
+                       tmp = dregs[addr - DSP_BASE];
                        break;
                }
                case DSP_CONTROL:

diff --git a/arch/mips/kernel/ptrace32.c b/arch/mips/kernel/ptrace32.c
index 89026d3..6990240 100644 (file)
--- a/arch/mips/kernel/ptrace32.c
+++ b/arch/mips/kernel/ptrace32.c
@@ -141,7 +141,7 @@ long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
                                goto out;
                        }
                        dregs = __get_dsp_regs(child);
-                       tmp = (unsigned long) (dregs[addr - DSP_BASE]);
+                       tmp = dregs[addr - DSP_BASE];
                        break;
                }
                case DSP_CONTROL: