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powerpc/32: Remove the counter in global_dbcr0

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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
This commit is contained in:
Christophe Leroy 2021-02-08 15:10:41 +00:00 committed by Michael Ellerman
parent 4d67facbcb
commit eb595eca74
3 changed files with 4 additions and 16 deletions
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12
arch/powerpc/kernel/entry_32.S
View File

@ -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) */

3
arch/powerpc/kernel/head_32.h
View File

@ -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 */

5
arch/powerpc/kernel/head_booke.h
View File

@ -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 */