diff options
| author | Christophe Leroy <christophe.leroy@csgroup.eu> | 2021-02-08 16:10:41 +0100 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2021-02-11 13:35:12 +0100 |
| commit | eb595eca74067b78d36fb188b555e30f28686fc7 (patch) | |
| tree | 05b0a21823ea9dd0ffe91304a211361ff9cc4c6e /arch | |
| parent | powerpc/32: Remove verification of MSR_PR on syscall in the ASM entry (diff) | |
| download | linux-eb595eca74067b78d36fb188b555e30f28686fc7.tar.xz linux-eb595eca74067b78d36fb188b555e30f28686fc7.zip | |
powerpc/32: Remove the counter in global_dbcr0
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 <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/7e381dc58b3f583556cfab37ba5d813bfd5cce1e.1612796617.git.christophe.leroy@csgroup.eu
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/powerpc/kernel/entry_32.S | 12 | ||||
| -rw-r--r-- | arch/powerpc/kernel/head_32.h | 3 | ||||
| -rw-r--r-- | 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 cffe58e63356..9dd90be9f8a5 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 @@ -981,14 +978,11 @@ 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 @@ -997,7 +991,7 @@ 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 0e0e7b5b93ab..1afad7bc3395 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 */ |