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authorKinsey Ho <kinseyho@google.com>2023-12-27 17:12:01 +0300
committerAndrew Morton <akpm@linux-foundation.org>2024-01-05 21:17:44 +0300
commit71ce1ab54a505736786d9c5921e6c2718c7ec535 (patch)
treede4090fee7d620e332f05c183b9cbe6138ee26e3 /arch/x86/include
parent9c5938694cd0e9e00bdfb7e60900673263daf4d5 (diff)
downloadlinux-71ce1ab54a505736786d9c5921e6c2718c7ec535.tar.xz
mm/mglru: add CONFIG_ARCH_HAS_HW_PTE_YOUNG
Patch series "mm/mglru: Kconfig cleanup", v4. This series is the result of the following discussion: https://lore.kernel.org/47066176-bd93-55dd-c2fa-002299d9e034@linux.ibm.com/ It mainly avoids building the code that walks page tables on CPUs that use it, i.e., those don't support hardware accessed bit. Specifically, it introduces a new Kconfig to guard some of functions added by commit bd74fdaea146 ("mm: multi-gen LRU: support page table walks") on CPUs like POWER9, on which the series was tested. This patch (of 5): Some architectures are able to set the accessed bit in PTEs when PTEs are used as part of linear address translations. Add CONFIG_ARCH_HAS_HW_PTE_YOUNG for such architectures to be able to override arch_has_hw_pte_young(). Link: https://lkml.kernel.org/r/20231227141205.2200125-1-kinseyho@google.com Link: https://lkml.kernel.org/r/20231227141205.2200125-2-kinseyho@google.com Signed-off-by: Kinsey Ho <kinseyho@google.com> Co-developed-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> Tested-by: Donet Tom <donettom@linux.vnet.ibm.com> Acked-by: Yu Zhao <yuzhao@google.com> Cc: kernel test robot <lkp@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'arch/x86/include')
-rw-r--r--arch/x86/include/asm/pgtable.h6
1 files changed, 0 insertions, 6 deletions
diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h
index 57bab91bbf50..08b5cb22d9a6 100644
--- a/arch/x86/include/asm/pgtable.h
+++ b/arch/x86/include/asm/pgtable.h
@@ -1679,12 +1679,6 @@ static inline bool arch_has_pfn_modify_check(void)
return boot_cpu_has_bug(X86_BUG_L1TF);
}
-#define arch_has_hw_pte_young arch_has_hw_pte_young
-static inline bool arch_has_hw_pte_young(void)
-{
- return true;
-}
-
#define arch_check_zapped_pte arch_check_zapped_pte
void arch_check_zapped_pte(struct vm_area_struct *vma, pte_t pte);