[PATCH v5 21/22] powerpc/32: Remove the counter in global_dbcr0
From: Christophe Leroy <hidden>
Date: 2021-02-08 16:35:43
Also in:
lkml
Subsystem:
linux for powerpc (32-bit and 64-bit), the rest · Maintainers:
Madhavan Srinivasan, Michael Ellerman, Linus Torvalds
global_dbcr0 has two parts, 4 bytes to save/restore the value of SPRN_DBCR0, and 4 bytes that are incremented/decremented everytime something is saving/loading the above value. This counter is only incremented/decremented, its value is never used and never read. Remove the counter and devide the size of global_dbcr0 by 2. Signed-off-by: Christophe Leroy <redacted> --- v5: New --- arch/powerpc/kernel/entry_32.S | 12 +++--------- arch/powerpc/kernel/head_32.h | 3 --- arch/powerpc/kernel/head_booke.h | 5 +---- 3 files changed, 4 insertions(+), 16 deletions(-)
diff --git a/arch/powerpc/kernel/entry_32.S b/arch/powerpc/kernel/entry_32.S
index 7c824e8928d0..a574201b0eb6 100644
--- a/arch/powerpc/kernel/entry_32.S
+++ b/arch/powerpc/kernel/entry_32.S@@ -175,14 +175,11 @@ transfer_to_handler: addi r11,r11,global_dbcr0@l #ifdef CONFIG_SMP lwz r9,TASK_CPU(r2) - slwi r9,r9,3 + slwi r9,r9,2 add r11,r11,r9 #endif lwz r12,0(r11) mtspr SPRN_DBCR0,r12 - lwz r12,4(r11) - addi r12,r12,-1 - stw r12,4(r11) #endif b 3f
@@ -980,14 +977,11 @@ load_dbcr0: addi r11,r11,global_dbcr0@l #ifdef CONFIG_SMP lwz r9,TASK_CPU(r2) - slwi r9,r9,3 + slwi r9,r9,2 add r11,r11,r9 #endif stw r10,0(r11) mtspr SPRN_DBCR0,r0 - lwz r10,4(r11) - addi r10,r10,1 - stw r10,4(r11) li r11,-1 mtspr SPRN_DBSR,r11 /* clear all pending debug events */ blr
@@ -996,7 +990,7 @@ load_dbcr0: .align 4 .global global_dbcr0 global_dbcr0: - .space 8*NR_CPUS + .space 4*NR_CPUS .previous #endif /* !(CONFIG_4xx || CONFIG_BOOKE) */
diff --git a/arch/powerpc/kernel/head_32.h b/arch/powerpc/kernel/head_32.h
index 282d8fd443a9..5001c6ecc3ec 100644
--- a/arch/powerpc/kernel/head_32.h
+++ b/arch/powerpc/kernel/head_32.h@@ -166,9 +166,6 @@ addi r11,r11,global_dbcr0@l lwz r12,0(r11) mtspr SPRN_DBCR0,r12 - lwz r12,4(r11) - addi r12,r12,-1 - stw r12,4(r11) 3: #endif b transfer_to_syscall /* jump to handler */
diff --git a/arch/powerpc/kernel/head_booke.h b/arch/powerpc/kernel/head_booke.h
index bfbd240cc8a2..5f565232b99d 100644
--- a/arch/powerpc/kernel/head_booke.h
+++ b/arch/powerpc/kernel/head_booke.h@@ -142,14 +142,11 @@ ALT_FTR_SECTION_END_IFSET(CPU_FTR_EMB_HV) addi r11,r11,global_dbcr0@l #ifdef CONFIG_SMP lwz r10, TASK_CPU(r2) - slwi r10, r10, 3 + slwi r10, r10, 2 add r11, r11, r10 #endif lwz r12,0(r11) mtspr SPRN_DBCR0,r12 - lwz r12,4(r11) - addi r12,r12,-1 - stw r12,4(r11) 3: b transfer_to_syscall /* jump to handler */
--
2.25.0