powerpc/paca: Remove mm_ctx_id and mm_ctx_slb_addr_limit

mm_ctx_id and mm_ctx_slb_addr_limit are not used anymore.

Remove them.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Reviewed-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/6e1813953da38c452c131fe3e2a2761a0fddb975.1620223303.git.christophe.leroy@csgroup.eu

arch/powerpc/include/asm/paca.h

@@ -149,11 +149,9 @@ struct paca_struct {
 #endif /* CONFIG_PPC_BOOK3E */
 
 #ifdef CONFIG_PPC_BOOK3S
-	mm_context_id_t mm_ctx_id;
 #ifdef CONFIG_PPC_MM_SLICES
 	unsigned char mm_ctx_low_slices_psize[BITS_PER_LONG / BITS_PER_BYTE];
 	unsigned char mm_ctx_high_slices_psize[SLICE_ARRAY_SIZE];
-	unsigned long mm_ctx_slb_addr_limit;
 #else
 	u16 mm_ctx_user_psize;
 	u16 mm_ctx_sllp;

arch/powerpc/kernel/paca.c

@@ -346,10 +346,8 @@ void copy_mm_to_paca(struct mm_struct *mm)
 #ifdef CONFIG_PPC_BOOK3S
 	mm_context_t *context = &mm->context;
 
-	get_paca()->mm_ctx_id = context->id;
 #ifdef CONFIG_PPC_MM_SLICES
 	VM_BUG_ON(!mm_ctx_slb_addr_limit(context));
-	get_paca()->mm_ctx_slb_addr_limit = mm_ctx_slb_addr_limit(context);
 	memcpy(&get_paca()->mm_ctx_low_slices_psize, mm_ctx_low_slices(context),
 	       LOW_SLICE_ARRAY_SZ);
 	memcpy(&get_paca()->mm_ctx_high_slices_psize, mm_ctx_high_slices(context),