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author | Maciej W. Rozycki <macro@mips.com> | 2018-05-16 01:33:26 +0300 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-09-05 10:16:23 +0300 |
commit | 1d7acd2e136511d8d7e5a52e9fa8489502263962 (patch) | |
tree | 309c120274a5cfef139a5edf35ad0d3df1aaaf29 | |
parent | 7ab91fb4243859720792b7d3436dcd262ccc187a (diff) | |
download | linux-1d7acd2e136511d8d7e5a52e9fa8489502263962.tar.xz |
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>
-rw-r--r-- | arch/mips/include/asm/processor.h | 2 | ||||
-rw-r--r-- | arch/mips/kernel/ptrace.c | 2 | ||||
-rw-r--r-- | arch/mips/kernel/ptrace32.c | 2 |
3 files changed, 3 insertions, 3 deletions
diff --git a/arch/mips/include/asm/processor.h b/arch/mips/include/asm/processor.h index 578ece1e4a99..351a5a9e4f52 100644 --- 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]; diff --git a/arch/mips/kernel/ptrace.c b/arch/mips/kernel/ptrace.c index c1bd750494c1..0b16f07ada9f 100644 --- a/arch/mips/kernel/ptrace.c +++ b/arch/mips/kernel/ptrace.c @@ -751,7 +751,7 @@ 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 d95117e71f69..286ec2d24d47 100644 --- a/arch/mips/kernel/ptrace32.c +++ b/arch/mips/kernel/ptrace32.c @@ -140,7 +140,7 @@ 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: |