powerpc: Rename THREAD_INFO to TASK_STACK

This patch renames THREAD_INFO to TASK_STACK, because it is in fact
the offset of the pointer to the stack in task_struct so this pointer
will not be impacted by the move of THREAD_INFO.

Also make it available on 64-bit, as we'll need it there when we
activate THREAD_INFO_IN_TASK.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Reviewed-by: Nicholas Piggin <npiggin@gmail.com>
[mpe: Make available on 64-bit]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

diff --git a/arch/powerpc/kernel/asm-offsets.c b/arch/powerpc/kernel/asm-offsets.c
index d6f9bdb..ca55027 100644 (file)
--- a/arch/powerpc/kernel/asm-offsets.c
+++ b/arch/powerpc/kernel/asm-offsets.c
@@ -90,13 +90,13 @@ int main(void)
        DEFINE(SIGSEGV, SIGSEGV);
        DEFINE(NMI_MASK, NMI_MASK);
 #else
-       OFFSET(THREAD_INFO, task_struct, stack);
        DEFINE(THREAD_INFO_GAP, _ALIGN_UP(sizeof(struct thread_info), 16));
        OFFSET(KSP_LIMIT, thread_struct, ksp_limit);
 #ifdef CONFIG_PPC_RTAS
        OFFSET(RTAS_SP, thread_struct, rtas_sp);
 #endif
 #endif /* CONFIG_PPC64 */
+       OFFSET(TASK_STACK, task_struct, stack);
 
 #ifdef CONFIG_LIVEPATCH
        OFFSET(TI_livepatch_sp, thread_info, livepatch_sp);

diff --git a/arch/powerpc/kernel/entry_32.S b/arch/powerpc/kernel/entry_32.S
index 0c69773..063100d 100644 (file)
--- a/arch/powerpc/kernel/entry_32.S
+++ b/arch/powerpc/kernel/entry_32.S
@@ -1165,7 +1165,7 @@ ret_from_debug_exc:
        mfspr   r9,SPRN_SPRG_THREAD
        lwz     r10,SAVED_KSP_LIMIT(r1)
        stw     r10,KSP_LIMIT(r9)
-       lwz     r9,THREAD_INFO-THREAD(r9)
+       lwz     r9,TASK_STACK-THREAD(r9)
        CURRENT_THREAD_INFO(r10, r1)
        lwz     r10,TI_PREEMPT(r10)
        stw     r10,TI_PREEMPT(r9)

diff --git a/arch/powerpc/kernel/head_32.S b/arch/powerpc/kernel/head_32.S
index 613900b..e07cfd5 100644 (file)
--- a/arch/powerpc/kernel/head_32.S
+++ b/arch/powerpc/kernel/head_32.S
@@ -261,7 +261,7 @@ __secondary_hold_acknowledge:
        tophys(r11,r1);                 /* use tophys(r1) if kernel */ \
        beq     1f;             \
        mfspr   r11,SPRN_SPRG_THREAD;   \
-       lwz     r11,THREAD_INFO-THREAD(r11);    \
+       lwz     r11,TASK_STACK-THREAD(r11);     \
        addi    r11,r11,THREAD_SIZE;    \
        tophys(r11,r11);        \
 1:     subi    r11,r11,INT_FRAME_SIZE  /* alloc exc. frame */

diff --git a/arch/powerpc/kernel/head_40x.S b/arch/powerpc/kernel/head_40x.S
index 11dd09d..a9c934f 100644 (file)
--- a/arch/powerpc/kernel/head_40x.S
+++ b/arch/powerpc/kernel/head_40x.S
@@ -115,7 +115,7 @@ _ENTRY(saved_ksp_limit)
        andi.   r11,r11,MSR_PR;                                              \
        beq     1f;                                                          \
        mfspr   r1,SPRN_SPRG_THREAD;    /* if from user, start at top of   */\
-       lwz     r1,THREAD_INFO-THREAD(r1); /* this thread's kernel stack   */\
+       lwz     r1,TASK_STACK-THREAD(r1); /* this thread's kernel stack   */\
        addi    r1,r1,THREAD_SIZE;                                           \
 1:     subi    r1,r1,INT_FRAME_SIZE;   /* Allocate an exception frame     */\
        tophys(r11,r1);                                                      \
@@ -158,7 +158,7 @@ _ENTRY(saved_ksp_limit)
        beq     1f;                                                          \
        /* COMING FROM USER MODE */                                          \
        mfspr   r11,SPRN_SPRG_THREAD;   /* if from user, start at top of   */\
-       lwz     r11,THREAD_INFO-THREAD(r11); /* this thread's kernel stack */\
+       lwz     r11,TASK_STACK-THREAD(r11); /* this thread's kernel stack */\
 1:     addi    r11,r11,THREAD_SIZE-INT_FRAME_SIZE; /* Alloc an excpt frm  */\
        tophys(r11,r11);                                                     \
        stw     r10,_CCR(r11);          /* save various registers          */\

diff --git a/arch/powerpc/kernel/head_8xx.S b/arch/powerpc/kernel/head_8xx.S
index 50303d2..03c73b4 100644 (file)
--- a/arch/powerpc/kernel/head_8xx.S
+++ b/arch/powerpc/kernel/head_8xx.S
@@ -142,7 +142,7 @@ instruction_counter:
        tophys(r11,r1);                 /* use tophys(r1) if kernel */ \
        beq     1f;             \
        mfspr   r11,SPRN_SPRG_THREAD;   \
-       lwz     r11,THREAD_INFO-THREAD(r11);    \
+       lwz     r11,TASK_STACK-THREAD(r11);     \
        addi    r11,r11,THREAD_SIZE;    \
        tophys(r11,r11);        \
 1:     subi    r11,r11,INT_FRAME_SIZE  /* alloc exc. frame */

diff --git a/arch/powerpc/kernel/head_booke.h b/arch/powerpc/kernel/head_booke.h
index 306e26c..69e80e6 100644 (file)
--- a/arch/powerpc/kernel/head_booke.h
+++ b/arch/powerpc/kernel/head_booke.h
@@ -55,7 +55,7 @@ END_BTB_FLUSH_SECTION
        beq     1f;                                                          \
        BOOKE_CLEAR_BTB(r11)                                            \
        /* if from user, start at top of this thread's kernel stack */       \
-       lwz     r11, THREAD_INFO-THREAD(r10);                                \
+       lwz     r11, TASK_STACK - THREAD(r10);                               \
        ALLOC_STACK_FRAME(r11, THREAD_SIZE);                                 \
 1 :    subi    r11, r11, INT_FRAME_SIZE; /* Allocate exception frame */     \
        stw     r13, _CCR(r11);         /* save various registers */         \
@@ -142,7 +142,7 @@ END_BTB_FLUSH_SECTION
        BOOKE_CLEAR_BTB(r10)                                            \
        andi.   r11,r11,MSR_PR;                                              \
        mfspr   r11,SPRN_SPRG_THREAD;   /* if from user, start at top of   */\
-       lwz     r11,THREAD_INFO-THREAD(r11); /* this thread's kernel stack */\
+       lwz     r11, TASK_STACK - THREAD(r11); /* this thread's kernel stack */\
        addi    r11,r11,EXC_LVL_FRAME_OVERHEAD; /* allocate stack frame    */\
        beq     1f;                                                          \
        /* COMING FROM USER MODE */                                          \

diff --git a/arch/powerpc/kernel/head_fsl_booke.S b/arch/powerpc/kernel/head_fsl_booke.S
index 2c21e86..42d8d6f 100644 (file)
--- a/arch/powerpc/kernel/head_fsl_booke.S
+++ b/arch/powerpc/kernel/head_fsl_booke.S
@@ -719,7 +719,7 @@ finish_tlb_load:
 
        /* Get the next_tlbcam_idx percpu var */
 #ifdef CONFIG_SMP
-       lwz     r12, THREAD_INFO-THREAD(r12)
+       lwz     r12, TASK_STACK-THREAD(r12)
        lwz     r15, TI_CPU(r12)
        lis     r14, __per_cpu_offset@h
        ori     r14, r14, __per_cpu_offset@l