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| author | Christophe Leroy <christophe.leroy@csgroup.eu> | 2022-09-26 10:57:25 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2022-09-28 12:22:10 +0300 |
| commit | d7902d31cbc3bf72722768831a684b0286ccd523 (patch) | |
| tree | 353292c1a8bd9e34de528f9c93a82c99b33120c9 /arch/powerpc/mm/book3s64/hash_utils.c | |
| parent | 3e791d0f32b10eff9437822c6099c7a158560151 (diff) | |
| download | linux-d7902d31cbc3bf72722768831a684b0286ccd523.tar.xz | |
powerpc/64s: Allow double call of kernel_[un]map_linear_page()
If the page is already mapped resp. already unmapped, bail out.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Nicholas Miehlbradt <nicholas@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220926075726.2846-3-nicholas@linux.ibm.com
Diffstat (limited to 'arch/powerpc/mm/book3s64/hash_utils.c')
| -rw-r--r-- | arch/powerpc/mm/book3s64/hash_utils.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/arch/powerpc/mm/book3s64/hash_utils.c b/arch/powerpc/mm/book3s64/hash_utils.c index 4ec003d9e809..6d985acb1d39 100644 --- a/arch/powerpc/mm/book3s64/hash_utils.c +++ b/arch/powerpc/mm/book3s64/hash_utils.c @@ -1997,6 +1997,9 @@ static void kernel_map_linear_page(unsigned long vaddr, unsigned long lmi) if (!vsid) return; + if (linear_map_hash_slots[lmi] & 0x80) + return; + ret = hpte_insert_repeating(hash, vpn, __pa(vaddr), mode, HPTE_V_BOLTED, mmu_linear_psize, mmu_kernel_ssize); @@ -2016,7 +2019,10 @@ static void kernel_unmap_linear_page(unsigned long vaddr, unsigned long lmi) hash = hpt_hash(vpn, PAGE_SHIFT, mmu_kernel_ssize); spin_lock(&linear_map_hash_lock); - BUG_ON(!(linear_map_hash_slots[lmi] & 0x80)); + if (!(linear_map_hash_slots[lmi] & 0x80)) { + spin_unlock(&linear_map_hash_lock); + return; + } hidx = linear_map_hash_slots[lmi] & 0x7f; linear_map_hash_slots[lmi] = 0; spin_unlock(&linear_map_hash_lock); |