[PATCH] powerpc/ptrace: Make user_mode() common to PPC32 and PPC64

[PATCH] powerpc/ptrace: Make user_mode() common to PPC32 and PPC64

[Christophe Leroy]

Today we have:

	#ifdef __powerpc64__
	#define user_mode(regs) ((((regs)->msr) >> MSR_PR_LG) & 0x1)
	#else
	#define user_mode(regs) (((regs)->msr & MSR_PR) != 0)
	#endif

With ppc64_defconfig, we get:

	if (!user_mode(regs))
    14b4:	e9 3e 01 08 	ld      r9,264(r30)
    14b8:	71 29 40 00 	andi.   r9,r9,16384
    14bc:	41 82 07 a4 	beq     1c60 <.emulate_instruction+0x7d0>

If taking the ppc32 definition of user_mode(), the exact same code
is generated for ppc64_defconfig.

So, only keep one version of user_mode(), preferably the one not
using MSR_PR_LG which should be kept internal to reg.h.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
---
 arch/powerpc/include/asm/ptrace.h | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/arch/powerpc/include/asm/ptrace.h b/arch/powerpc/include/asm/ptrace.h
index 14422e851494..fd60538737a0 100644
--- a/arch/powerpc/include/asm/ptrace.h
+++ b/arch/powerpc/include/asm/ptrace.h
@@ -197,11 +197,7 @@ static inline unsigned long frame_pointer(struct pt_regs *regs)
 	return 0;
 }
 
-#ifdef __powerpc64__
-#define user_mode(regs) ((((regs)->msr) >> MSR_PR_LG) & 0x1)
-#else
 #define user_mode(regs) (((regs)->msr & MSR_PR) != 0)
-#endif
 
 #define force_successful_syscall_return()   \
 	do { \
-- 
2.25.0

Re: [PATCH] powerpc/ptrace: Make user_mode() common to PPC32 and PPC64

[Michael Ellerman]

On Tue, 17 Aug 2021 16:00:14 +0000 (UTC), Christophe Leroy wrote:
> Today we have:
> 
> 	#ifdef __powerpc64__
> 	#define user_mode(regs) ((((regs)->msr) >> MSR_PR_LG) & 0x1)
> 	#else
> 	#define user_mode(regs) (((regs)->msr & MSR_PR) != 0)
> 	#endif
> 
> [...]

Applied to powerpc/next.

[1/1] powerpc/ptrace: Make user_mode() common to PPC32 and PPC64
      https://git.kernel.org/powerpc/c/19e932eb6ea47f4f37513eb2ae0daee19117765c

cheers