linux-kernel - [PATCH 3.16 046/328] MIPS: Correct the 64-bit DSP accumulator register size

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Date:   Sun, 09 Dec 2018 21:50:33 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, "Maciej W. Rozycki" <macro@...s.com>,
        "Paul Burton" <paul.burton@...s.com>,
        linux-fsdevel@...r.kernel.org,
        "Ralf Baechle" <ralf@...ux-mips.org>,
        "Alexander Viro" <viro@...iv.linux.org.uk>,
        linux-mips@...ux-mips.org, "James Hogan" <jhogan@...nel.org>
Subject: [PATCH 3.16 046/328] MIPS: Correct the 64-bit DSP accumulator
 register size

3.16.62-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: "Maciej W. Rozycki" <macro@...s.com>

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@...s.com>
Signed-off-by: Paul Burton <paul.burton@...s.com>
Fixes: e50c0a8fa60d ("Support the MIPS32 / MIPS64 DSP ASE.")
Patchwork: https://patchwork.linux-mips.org/patch/19329/
Cc: Alexander Viro <viro@...iv.linux.org.uk>
Cc: James Hogan <jhogan@...nel.org>
Cc: Ralf Baechle <ralf@...ux-mips.org>
Cc: linux-fsdevel@...r.kernel.org
Cc: linux-mips@...ux-mips.org
Cc: linux-kernel@...r.kernel.org
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 arch/mips/include/asm/processor.h | 2 +-
 arch/mips/kernel/ptrace.c         | 2 +-
 arch/mips/kernel/ptrace32.c       | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

--- a/arch/mips/include/asm/processor.h
+++ b/arch/mips/include/asm/processor.h
@@ -143,7 +143,7 @@ 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];
--- a/arch/mips/kernel/ptrace.c
+++ b/arch/mips/kernel/ptrace.c
@@ -790,7 +790,7 @@ long arch_ptrace(struct task_struct *chi
 				goto out;
 			}
 			dregs = __get_dsp_regs(child);
-			tmp = (unsigned long) (dregs[addr - DSP_BASE]);
+			tmp = dregs[addr - DSP_BASE];
 			break;
 		}
 		case DSP_CONTROL:
--- a/arch/mips/kernel/ptrace32.c
+++ b/arch/mips/kernel/ptrace32.c
@@ -140,7 +140,7 @@ long compat_arch_ptrace(struct task_stru
 				goto out;
 			}
 			dregs = __get_dsp_regs(child);
-			tmp = (unsigned long) (dregs[addr - DSP_BASE]);
+			tmp = dregs[addr - DSP_BASE];
 			break;
 		}
 		case DSP_CONTROL: