Unloading/Reloading of modules seems to fail with KASAN_VMALLOC
but works properly with it.

Force selection of KASAN_VMALLOC when MODULES are selected, and
drop module_alloc() which was dedicated to KASAN for modules.

Reported-by: <erhar...@mailbox.org>
Link: https://bugzilla.kernel.org/show_bug.cgi?id=205283
Signed-off-by: Christophe Leroy <christophe.le...@c-s.fr>
---
 arch/powerpc/mm/kasan/kasan_init_32.c  | 31 +++++--------------------------
 arch/powerpc/platforms/Kconfig.cputype |  1 +
 2 files changed, 6 insertions(+), 26 deletions(-)

diff --git a/arch/powerpc/mm/kasan/kasan_init_32.c 
b/arch/powerpc/mm/kasan/kasan_init_32.c
index 88036fb88350..b782d92622b4 100644
--- a/arch/powerpc/mm/kasan/kasan_init_32.c
+++ b/arch/powerpc/mm/kasan/kasan_init_32.c
@@ -12,7 +12,7 @@
 #include <asm/code-patching.h>
 #include <mm/mmu_decl.h>
 
-static pgprot_t kasan_prot_ro(void)
+static pgprot_t __init kasan_prot_ro(void)
 {
        if (early_mmu_has_feature(MMU_FTR_HPTE_TABLE))
                return PAGE_READONLY;
@@ -20,7 +20,7 @@ static pgprot_t kasan_prot_ro(void)
        return PAGE_KERNEL_RO;
 }
 
-static void kasan_populate_pte(pte_t *ptep, pgprot_t prot)
+static void __init kasan_populate_pte(pte_t *ptep, pgprot_t prot)
 {
        unsigned long va = (unsigned long)kasan_early_shadow_page;
        phys_addr_t pa = __pa(kasan_early_shadow_page);
@@ -30,7 +30,7 @@ static void kasan_populate_pte(pte_t *ptep, pgprot_t prot)
                __set_pte_at(&init_mm, va, ptep, pfn_pte(PHYS_PFN(pa), prot), 
0);
 }
 
-static int __ref kasan_init_shadow_page_tables(unsigned long k_start, unsigned 
long k_end)
+static int __init kasan_init_shadow_page_tables(unsigned long k_start, 
unsigned long k_end)
 {
        pmd_t *pmd;
        unsigned long k_cur, k_next;
@@ -70,7 +70,7 @@ static int __ref kasan_init_shadow_page_tables(unsigned long 
k_start, unsigned l
        return 0;
 }
 
-static void __ref *kasan_get_one_page(void)
+static void __init *kasan_get_one_page(void)
 {
        if (slab_is_available())
                return (void *)__get_free_page(GFP_KERNEL | __GFP_ZERO);
@@ -78,7 +78,7 @@ static void __ref *kasan_get_one_page(void)
        return memblock_alloc(PAGE_SIZE, PAGE_SIZE);
 }
 
-static int __ref kasan_init_region(void *start, size_t size)
+static int __init kasan_init_region(void *start, size_t size)
 {
        unsigned long k_start = (unsigned long)kasan_mem_to_shadow(start);
        unsigned long k_end = (unsigned long)kasan_mem_to_shadow(start + size);
@@ -196,27 +196,6 @@ void __init kasan_late_init(void)
                kasan_unmap_early_shadow_vmalloc();
 }
 
-#if defined(CONFIG_MODULES) && !defined(CONFIG_KASAN_VMALLOC)
-void *module_alloc(unsigned long size)
-{
-       void *base;
-
-       base = __vmalloc_node_range(size, MODULE_ALIGN, VMALLOC_START, 
VMALLOC_END,
-                                   GFP_KERNEL, PAGE_KERNEL_EXEC, 
VM_FLUSH_RESET_PERMS,
-                                   NUMA_NO_NODE, __builtin_return_address(0));
-
-       if (!base)
-               return NULL;
-
-       if (!kasan_init_region(base, size))
-               return base;
-
-       vfree(base);
-
-       return NULL;
-}
-#endif
-
 #ifdef CONFIG_PPC_BOOK3S_32
 u8 __initdata early_hash[256 << 10] __aligned(256 << 10) = {0};
 
diff --git a/arch/powerpc/platforms/Kconfig.cputype 
b/arch/powerpc/platforms/Kconfig.cputype
index 536a2efcb7f0..851a92ffe290 100644
--- a/arch/powerpc/platforms/Kconfig.cputype
+++ b/arch/powerpc/platforms/Kconfig.cputype
@@ -2,6 +2,7 @@
 config PPC32
        bool
        default y if !PPC64
+       select KASAN_VMALLOC if KASAN && MODULES
 
 config PPC64
        bool "64-bit kernel"
-- 
2.13.3

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