Re: [PATCH v2 1/7] powerpc: Remove SYNC on non 6xx

[Christophe Leroy]

Le 29/09/2020 à 08:09, Christophe Leroy a écrit :

SYNC is usefull for Powerpc 601 only. On everything else,
SYNC is empty.

Remove it from code that is not made to run on 6xx.

Signed-off-by: Christophe Leroy <christophe.le...@csgroup.eu>

Oops, the last patch of the series is missing. Will resend, sorry for the noise.

Christophe

---
  arch/powerpc/kernel/head_40x.S   | 1 -
  arch/powerpc/kernel/head_booke.h | 1 -
  arch/powerpc/kernel/misc_64.S    | 1 -
  3 files changed, 3 deletions(-)

diff --git a/arch/powerpc/kernel/head_40x.S b/arch/powerpc/kernel/head_40x.S
index 5b282d9965a5..44c9018aed1b 100644
--- a/arch/powerpc/kernel/head_40x.S
+++ b/arch/powerpc/kernel/head_40x.S
@@ -72,7 +72,6 @@ turn_on_mmu:
        lis     r0,start_here@h
        ori     r0,r0,start_here@l
        mtspr   SPRN_SRR0,r0
-       SYNC
        rfi                             /* enables MMU */
        b       .                       /* prevent prefetch past rfi */

diff --git a/arch/powerpc/kernel/head_booke.h b/arch/powerpc/kernel/head_booke.h

index 18f87bf9e32b..71c359d438b5 100644
--- a/arch/powerpc/kernel/head_booke.h
+++ b/arch/powerpc/kernel/head_booke.h
@@ -176,7 +176,6 @@ ALT_FTR_SECTION_END_IFSET(CPU_FTR_EMB_HV)
  #endif
        mtspr   SPRN_SRR1,r10
        mtspr   SPRN_SRR0,r11
-       SYNC
        RFI                             /* jump to handler, enable MMU */
  99:   b       ret_from_kernel_syscall
  .endm
diff --git a/arch/powerpc/kernel/misc_64.S b/arch/powerpc/kernel/misc_64.S
index 7bb46ad98207..070465825c21 100644
--- a/arch/powerpc/kernel/misc_64.S
+++ b/arch/powerpc/kernel/misc_64.S
@@ -365,7 +365,6 @@ _GLOBAL(kexec_smp_wait)

li r4,KEXEC_STATE_REAL_MODE

        stb     r4,PACAKEXECSTATE(r13)
-       SYNC

b kexec_wait