powerpc: Define swapper_pg_dir[] in C

Don't duplicate swapper_pg_dir[] in each platform's head.S

Define it in mm/pgtable.c

Define MAX_PTRS_PER_PGD because on book3s/64 PTRS_PER_PGD is
not a constant.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/5e3f1b8a4695c33ccc80aa3870e016bef32b85e1.1623063174.git.christophe.leroy@csgroup.eu

diff --git a/arch/powerpc/include/asm/book3s/64/pgtable.h b/arch/powerpc/include/asm/book3s/64/pgtable.h
index a666d56..4d9941b 100644 (file)
--- a/arch/powerpc/include/asm/book3s/64/pgtable.h
+++ b/arch/powerpc/include/asm/book3s/64/pgtable.h
@@ -232,6 +232,9 @@ extern unsigned long __pmd_frag_size_shift;
 #define PTRS_PER_PUD   (1 << PUD_INDEX_SIZE)
 #define PTRS_PER_PGD   (1 << PGD_INDEX_SIZE)
 
+#define MAX_PTRS_PER_PGD       (1 << (H_PGD_INDEX_SIZE > RADIX_PGD_INDEX_SIZE ? \
+                                      H_PGD_INDEX_SIZE : RADIX_PGD_INDEX_SIZE))
+
 /* PMD_SHIFT determines what a second-level page table entry can map */
 #define PMD_SHIFT      (PAGE_SHIFT + PTE_INDEX_SIZE)
 #define PMD_SIZE       (1UL << PMD_SHIFT)

diff --git a/arch/powerpc/include/asm/pgtable.h b/arch/powerpc/include/asm/pgtable.h
index c6a6767..b9c8641 100644 (file)
--- a/arch/powerpc/include/asm/pgtable.h
+++ b/arch/powerpc/include/asm/pgtable.h
@@ -41,6 +41,10 @@ struct mm_struct;
 
 #ifndef __ASSEMBLY__
 
+#ifndef MAX_PTRS_PER_PGD
+#define MAX_PTRS_PER_PGD PTRS_PER_PGD
+#endif
+
 /* Keep these as a macros to avoid include dependency mess */
 #define pte_page(x)            pfn_to_page(pte_pfn(x))
 #define mk_pte(page, pgprot)   pfn_pte(page_to_pfn(page), (pgprot))

diff --git a/arch/powerpc/kernel/asm-offsets.c b/arch/powerpc/kernel/asm-offsets.c
index 672e7e2..c46685c 100644 (file)
--- a/arch/powerpc/kernel/asm-offsets.c
+++ b/arch/powerpc/kernel/asm-offsets.c
@@ -354,11 +354,6 @@ int main(void)
        DEFINE(BUG_ENTRY_SIZE, sizeof(struct bug_entry));
 #endif
 
-#ifdef CONFIG_PPC_BOOK3S_64
-       DEFINE(PGD_TABLE_SIZE, (sizeof(pgd_t) << max(RADIX_PGD_INDEX_SIZE, H_PGD_INDEX_SIZE)));
-#else
-       DEFINE(PGD_TABLE_SIZE, PGD_TABLE_SIZE);
-#endif
        DEFINE(PTE_SIZE, sizeof(pte_t));
 
 #ifdef CONFIG_KVM

diff --git a/arch/powerpc/kernel/head_40x.S b/arch/powerpc/kernel/head_40x.S
index 92b6c73..7d72ee5 100644 (file)
--- a/arch/powerpc/kernel/head_40x.S
+++ b/arch/powerpc/kernel/head_40x.S
@@ -701,14 +701,3 @@ _GLOBAL(abort)
         mfspr   r13,SPRN_DBCR0
         oris    r13,r13,DBCR0_RST_SYSTEM@h
         mtspr   SPRN_DBCR0,r13
-
-/* We put a few things here that have to be page-aligned. This stuff
- * goes at the beginning of the data segment, which is page-aligned.
- */
-       .data
-       .align  12
-       .globl  sdata
-sdata:
-       .globl  swapper_pg_dir
-swapper_pg_dir:
-       .space  PGD_TABLE_SIZE

diff --git a/arch/powerpc/kernel/head_44x.S b/arch/powerpc/kernel/head_44x.S
index e037eb6..ddc978a 100644 (file)
--- a/arch/powerpc/kernel/head_44x.S
+++ b/arch/powerpc/kernel/head_44x.S
@@ -1233,23 +1233,8 @@ head_start_common:
        isync
        blr
 
-/*
- * We put a few things here that have to be page-aligned. This stuff
- * goes at the beginning of the data segment, which is page-aligned.
- */
-       .data
-       .align  PAGE_SHIFT
-       .globl  sdata
-sdata:
-
-/*
- * To support >32-bit physical addresses, we use an 8KB pgdir.
- */
-       .globl  swapper_pg_dir
-swapper_pg_dir:
-       .space  PGD_TABLE_SIZE
-
 #ifdef CONFIG_SMP
+       .data
        .align  12
 temp_boot_stack:
        .space  1024

diff --git a/arch/powerpc/kernel/head_64.S b/arch/powerpc/kernel/head_64.S
index 730838c..79f2d1e 100644 (file)
--- a/arch/powerpc/kernel/head_64.S
+++ b/arch/powerpc/kernel/head_64.S
@@ -997,18 +997,3 @@ start_here_common:
 0:     trap
        EMIT_BUG_ENTRY 0b, __FILE__, __LINE__, 0
        .previous
-
-/*
- * We put a few things here that have to be page-aligned.
- * This stuff goes at the beginning of the bss, which is page-aligned.
- */
-       .section ".bss"
-/*
- * pgd dir should be aligned to PGD_TABLE_SIZE which is 64K.
- * We will need to find a better way to fix this
- */
-       .align  16
-
-       .globl  swapper_pg_dir
-swapper_pg_dir:
-       .space  PGD_TABLE_SIZE

diff --git a/arch/powerpc/kernel/head_8xx.S b/arch/powerpc/kernel/head_8xx.S
index 5ce42df..9bdb95f 100644 (file)
--- a/arch/powerpc/kernel/head_8xx.S
+++ b/arch/powerpc/kernel/head_8xx.S
@@ -786,15 +786,3 @@ _GLOBAL(mmu_pin_tlb)
        mtspr   SPRN_SRR1, r10
        mtspr   SPRN_SRR0, r11
        rfi
-
-/*
- * We put a few things here that have to be page-aligned.
- * This stuff goes at the beginning of the data segment,
- * which is page-aligned.
- */
-       .data
-       .globl  sdata
-sdata:
-       .globl  swapper_pg_dir
-swapper_pg_dir:
-       .space  PGD_TABLE_SIZE

diff --git a/arch/powerpc/kernel/head_book3s_32.S b/arch/powerpc/kernel/head_book3s_32.S
index 59ddd68..e8d861e 100644 (file)
--- a/arch/powerpc/kernel/head_book3s_32.S
+++ b/arch/powerpc/kernel/head_book3s_32.S
@@ -1208,14 +1208,4 @@ setup_usbgecko_bat:
        blr
 #endif
 
-/*
- * We put a few things here that have to be page-aligned.
- * This stuff goes at the beginning of the data segment,
- * which is page-aligned.
- */
        .data
-       .globl  sdata
-sdata:
-       .globl  swapper_pg_dir
-swapper_pg_dir:
-       .space  PGD_TABLE_SIZE

diff --git a/arch/powerpc/kernel/head_fsl_booke.S b/arch/powerpc/kernel/head_fsl_booke.S
index f33bc5a..0f9642f 100644 (file)
--- a/arch/powerpc/kernel/head_fsl_booke.S
+++ b/arch/powerpc/kernel/head_fsl_booke.S
@@ -1212,15 +1212,3 @@ _GLOBAL(restore_to_as0)
        */
 3:     mr      r3,r5
        bl      _start
-
-/*
- * We put a few things here that have to be page-aligned. This stuff
- * goes at the beginning of the data segment, which is page-aligned.
- */
-       .data
-       .align  12
-       .globl  sdata
-sdata:
-       .globl  swapper_pg_dir
-swapper_pg_dir:
-       .space  PGD_TABLE_SIZE

diff --git a/arch/powerpc/mm/pgtable.c b/arch/powerpc/mm/pgtable.c
index 3546119..1707ab5 100644 (file)
--- a/arch/powerpc/mm/pgtable.c
+++ b/arch/powerpc/mm/pgtable.c
@@ -28,6 +28,8 @@
 #include <asm/hugetlb.h>
 #include <asm/pte-walk.h>
 
+pgd_t swapper_pg_dir[MAX_PTRS_PER_PGD] __page_aligned_bss;
+
 static inline int is_exec_fault(void)
 {
        return current->thread.regs && TRAP(current->thread.regs) == 0x400;