powerpc/mm: make ioremap_bot common to all
Drop multiple definitions of ioremap_bot and make one common to
all subarches.
Only CONFIG_PPC_BOOK3E_64 had a global static init value for
ioremap_bot. Now ioremap_bot is set in early_init_mmu_global().
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/920eebfd9f36f14c79d1755847f5bf7c83703bdd.1566309262.git.christophe.leroy@c-s.fr
diff --git a/arch/powerpc/include/asm/book3s/32/pgtable.h b/arch/powerpc/include/asm/book3s/32/pgtable.h
index 838de59..aa1bc5f 100644
--- a/arch/powerpc/include/asm/book3s/32/pgtable.h
+++ b/arch/powerpc/include/asm/book3s/32/pgtable.h
@@ -201,8 +201,6 @@ int map_kernel_page(unsigned long va, phys_addr_t pa, pgprot_t prot);
#include <linux/sched.h>
#include <linux/threads.h>
-extern unsigned long ioremap_bot;
-
/* Bits to mask out from a PGD to get to the PUD page */
#define PGD_MASKED_BITS 0
diff --git a/arch/powerpc/include/asm/book3s/64/pgtable.h b/arch/powerpc/include/asm/book3s/64/pgtable.h
index 8e47fb8..03c9a14 100644
--- a/arch/powerpc/include/asm/book3s/64/pgtable.h
+++ b/arch/powerpc/include/asm/book3s/64/pgtable.h
@@ -289,7 +289,6 @@ extern unsigned long __kernel_io_end;
#define KERN_IO_END __kernel_io_end
extern struct page *vmemmap;
-extern unsigned long ioremap_bot;
extern unsigned long pci_io_base;
#endif /* __ASSEMBLY__ */
diff --git a/arch/powerpc/include/asm/nohash/32/pgtable.h b/arch/powerpc/include/asm/nohash/32/pgtable.h
index 0284f8f..7ce2a7c 100644
--- a/arch/powerpc/include/asm/nohash/32/pgtable.h
+++ b/arch/powerpc/include/asm/nohash/32/pgtable.h
@@ -11,8 +11,6 @@
#include <asm/mmu.h> /* For sub-arch specific PPC_PIN_SIZE */
#include <asm/asm-405.h>
-extern unsigned long ioremap_bot;
-
#ifdef CONFIG_44x
extern int icache_44x_need_flush;
#endif
diff --git a/arch/powerpc/include/asm/pgtable.h b/arch/powerpc/include/asm/pgtable.h
index c70916a..8b7865a 100644
--- a/arch/powerpc/include/asm/pgtable.h
+++ b/arch/powerpc/include/asm/pgtable.h
@@ -68,6 +68,8 @@ extern pgd_t swapper_pg_dir[];
extern void paging_init(void);
+extern unsigned long ioremap_bot;
+
/*
* kern_addr_valid is intended to indicate whether an address is a valid
* kernel address. Most 32-bit archs define it as always true (like this)
diff --git a/arch/powerpc/mm/ioremap.c b/arch/powerpc/mm/ioremap.c
index 3d388aa..eaf5f8a 100644
--- a/arch/powerpc/mm/ioremap.c
+++ b/arch/powerpc/mm/ioremap.c
@@ -3,6 +3,9 @@
#include <linux/io.h>
#include <asm/io-workarounds.h>
+unsigned long ioremap_bot;
+EXPORT_SYMBOL(ioremap_bot);
+
void __iomem *ioremap(phys_addr_t addr, unsigned long size)
{
pgprot_t prot = pgprot_noncached(PAGE_KERNEL);
diff --git a/arch/powerpc/mm/mmu_decl.h b/arch/powerpc/mm/mmu_decl.h
index adbaf21..c750ac9 100644
--- a/arch/powerpc/mm/mmu_decl.h
+++ b/arch/powerpc/mm/mmu_decl.h
@@ -106,7 +106,6 @@ extern u8 early_hash[];
#endif /* CONFIG_PPC32 */
-extern unsigned long ioremap_bot;
extern unsigned long __max_low_memory;
extern phys_addr_t __initial_memory_limit_addr;
extern phys_addr_t total_memory;
diff --git a/arch/powerpc/mm/nohash/tlb.c b/arch/powerpc/mm/nohash/tlb.c
index bf60983..696f568 100644
--- a/arch/powerpc/mm/nohash/tlb.c
+++ b/arch/powerpc/mm/nohash/tlb.c
@@ -703,6 +703,8 @@ static void __init early_init_mmu_global(void)
* for use by the TLB miss code
*/
linear_map_top = memblock_end_of_DRAM();
+
+ ioremap_bot = IOREMAP_BASE;
}
static void __init early_mmu_set_memory_limit(void)
diff --git a/arch/powerpc/mm/pgtable_32.c b/arch/powerpc/mm/pgtable_32.c
index ac5a267..102901a1 100644
--- a/arch/powerpc/mm/pgtable_32.c
+++ b/arch/powerpc/mm/pgtable_32.c
@@ -33,9 +33,6 @@
#include <mm/mmu_decl.h>
-unsigned long ioremap_bot;
-EXPORT_SYMBOL(ioremap_bot); /* aka VMALLOC_END */
-
extern char etext[], _stext[], _sinittext[], _einittext[];
void __iomem *
diff --git a/arch/powerpc/mm/pgtable_64.c b/arch/powerpc/mm/pgtable_64.c
index 2b9078e..d865e05 100644
--- a/arch/powerpc/mm/pgtable_64.c
+++ b/arch/powerpc/mm/pgtable_64.c
@@ -98,9 +98,6 @@ unsigned long __pte_frag_nr;
EXPORT_SYMBOL(__pte_frag_nr);
unsigned long __pte_frag_size_shift;
EXPORT_SYMBOL(__pte_frag_size_shift);
-unsigned long ioremap_bot;
-#else /* !CONFIG_PPC_BOOK3S_64 */
-unsigned long ioremap_bot = IOREMAP_BASE;
#endif
int __weak ioremap_range(unsigned long ea, phys_addr_t pa, unsigned long size, pgprot_t prot, int nid)
