diff options
| author | Will Deacon <will.deacon@arm.com> | 2018-12-28 11:37:53 +0300 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2018-12-28 23:11:50 +0300 |
| commit | 8e2d43405b22e98cf5f3730c1829ec1fdbe17ae7 (patch) | |
| tree | c30cf15a54d92a9e56c9c2c1e5fd9455e816b432 /arch | |
| parent | 36ddc5a78c878e9b10c323d2fe88b0dae2f487eb (diff) | |
| download | linux-8e2d43405b22e98cf5f3730c1829ec1fdbe17ae7.tar.xz | |
lib/ioremap: ensure break-before-make is used for huge p4d mappings
Whilst no architectures actually enable support for huge p4d mappings in
the vmap area, the code that is implemented should be using
break-before-make, as we do for pud and pmd huge entries.
Link: http://lkml.kernel.org/r/1544120495-17438-6-git-send-email-will.deacon@arm.com
Signed-off-by: Will Deacon <will.deacon@arm.com>
Reviewed-by: Toshi Kani <toshi.kani@hpe.com>
Cc: Chintan Pandya <cpandya@codeaurora.org>
Cc: Toshi Kani <toshi.kani@hpe.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Michal Hocko <mhocko@suse.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm64/mm/mmu.c | 5 | ||||
| -rw-r--r-- | arch/x86/mm/pgtable.c | 8 |
2 files changed, 13 insertions, 0 deletions
diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c index 13b80361d9f5..b6f5aa52ac67 100644 --- a/arch/arm64/mm/mmu.c +++ b/arch/arm64/mm/mmu.c @@ -1043,6 +1043,11 @@ int pud_free_pmd_page(pud_t *pudp, unsigned long addr) return 1; } +int p4d_free_pud_page(p4d_t *p4d, unsigned long addr) +{ + return 0; /* Don't attempt a block mapping */ +} + #ifdef CONFIG_MEMORY_HOTPLUG int arch_add_memory(int nid, u64 start, u64 size, struct vmem_altmap *altmap, bool want_memblock) diff --git a/arch/x86/mm/pgtable.c b/arch/x86/mm/pgtable.c index e95a7d6ac8f8..b0284eab14dc 100644 --- a/arch/x86/mm/pgtable.c +++ b/arch/x86/mm/pgtable.c @@ -794,6 +794,14 @@ int pmd_clear_huge(pmd_t *pmd) return 0; } +/* + * Until we support 512GB pages, skip them in the vmap area. + */ +int p4d_free_pud_page(p4d_t *p4d, unsigned long addr) +{ + return 0; +} + #ifdef CONFIG_X86_64 /** * pud_free_pmd_page - Clear pud entry and free pmd page. |