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LoongArch: Set correct protection_map[] for VM_NONE/VM_SHARED

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For 32BIT platform _PAGE_PROTNONE is 0, so set a VMA to be VM_NONE or
VM_SHARED will make pages non-present, then cause Oops with kernel page
fault.

Fix it by set correct protection_map[] for VM_NONE/VM_SHARED, replacing
_PAGE_PROTNONE with _PAGE_PRESENT.

Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
This commit is contained in:
Huacai Chen 2025-12-31 15:19:10 +08:00
parent 807e5d383c
commit d5be446948
1 changed files with 4 additions and 4 deletions
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8
arch/loongarch/mm/cache.c
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@ -160,8 +160,8 @@ void cpu_cache_init(void)
static const pgprot_t protection_map[16] = {
[VM_NONE] = __pgprot(_CACHE_CC | _PAGE_USER |
_PAGE_PROTNONE | _PAGE_NO_EXEC |
_PAGE_NO_READ),
_PAGE_NO_EXEC | _PAGE_NO_READ |
(_PAGE_PROTNONE ? : _PAGE_PRESENT)),
[VM_READ] = __pgprot(_CACHE_CC | _PAGE_VALID |
_PAGE_USER | _PAGE_PRESENT |
_PAGE_NO_EXEC),
@ -180,8 +180,8 @@ static const pgprot_t protection_map[16] = {
[VM_EXEC | VM_WRITE | VM_READ] = __pgprot(_CACHE_CC | _PAGE_VALID |
_PAGE_USER | _PAGE_PRESENT),
[VM_SHARED] = __pgprot(_CACHE_CC | _PAGE_USER |
_PAGE_PROTNONE | _PAGE_NO_EXEC |
_PAGE_NO_READ),
_PAGE_NO_EXEC | _PAGE_NO_READ |
(_PAGE_PROTNONE ? : _PAGE_PRESENT)),
[VM_SHARED | VM_READ] = __pgprot(_CACHE_CC | _PAGE_VALID |
_PAGE_USER | _PAGE_PRESENT |
_PAGE_NO_EXEC),