Re: [PATCH v5 05/21] powerpc: Use a function for getting the instruction op code

[Christophe Leroy]

Le 06/04/2020 à 10:09, Jordan Niethe a écrit :

In preparation for using a data type for instructions that can not be
directly used with the '>>' operator use a function for getting the op
code of an instruction.

Signed-off-by: Jordan Niethe <jniet...@gmail.com>
---
v4: New to series
---
  arch/powerpc/include/asm/inst.h  | 5 +++++
  arch/powerpc/kernel/align.c      | 2 +-
  arch/powerpc/lib/code-patching.c | 4 ++--

What about store_updates_sp() in mm/fault.c ?

Christophe

  3 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/arch/powerpc/include/asm/inst.h b/arch/powerpc/include/asm/inst.h
index 5298ba33b6e5..93959016fe4b 100644
--- a/arch/powerpc/include/asm/inst.h
+++ b/arch/powerpc/include/asm/inst.h
@@ -8,4 +8,9 @@

#define ppc_inst(x) (x) +static inline int ppc_inst_opcode(u32 x)

+{
+       return x >> 26;
+}
+
  #endif /* _ASM_INST_H */
diff --git a/arch/powerpc/kernel/align.c b/arch/powerpc/kernel/align.c
index 86e9bf62f18c..691013aa9f3c 100644
--- a/arch/powerpc/kernel/align.c
+++ b/arch/powerpc/kernel/align.c
@@ -314,7 +314,7 @@ int fix_alignment(struct pt_regs *regs)
        }

#ifdef CONFIG_SPE

-       if ((instr >> 26) == 0x4) {
+       if (ppc_inst_opcode(instr) == 0x4) {
                int reg = (instr >> 21) & 0x1f;
                PPC_WARN_ALIGNMENT(spe, regs);
                return emulate_spe(regs, reg, instr);
diff --git a/arch/powerpc/lib/code-patching.c b/arch/powerpc/lib/code-patching.c
index fdf0d6ea3575..099a515202aa 100644
--- a/arch/powerpc/lib/code-patching.c
+++ b/arch/powerpc/lib/code-patching.c
@@ -231,7 +231,7 @@ bool is_offset_in_branch_range(long offset)
   */
  bool is_conditional_branch(unsigned int instr)
  {
-       unsigned int opcode = instr >> 26;
+       unsigned int opcode = ppc_inst_opcode(instr);

if (opcode == 16) /* bc, bca, bcl, bcla */

                return true;
@@ -289,7 +289,7 @@ int create_cond_branch(unsigned int *instr, const unsigned 
int *addr,

static unsigned int branch_opcode(unsigned int instr)

  {
-       return (instr >> 26) & 0x3F;
+       return ppc_inst_opcode(instr) & 0x3F;
  }

static int instr_is_branch_iform(unsigned int instr)