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mm/mglru: add CONFIG_ARCH_HAS_HW_PTE_YOUNG

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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 bd74fdaea1 ("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>
This commit is contained in:
Kinsey Ho 2023-12-27 14:12:01 +00:00 committed by Andrew Morton
parent 9c5938694c
commit 71ce1ab54a
5 changed files with 11 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
arch/Kconfig
View File

@ -1470,6 +1470,14 @@ config DYNAMIC_SIGFRAME
config HAVE_ARCH_NODE_DEV_GROUP
bool
config ARCH_HAS_HW_PTE_YOUNG
bool
help
Architectures that select this option are capable of setting the
accessed bit in PTE entries when using them as part of linear address
translations. Architectures that require runtime check should select
this option and override arch_has_hw_pte_young().
config ARCH_HAS_NONLEAF_PMD_YOUNG
bool
help

1
arch/arm64/Kconfig
View File

@ -36,6 +36,7 @@ config ARM64
select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE
select ARCH_HAS_PTE_DEVMAP
select ARCH_HAS_PTE_SPECIAL
select ARCH_HAS_HW_PTE_YOUNG
select ARCH_HAS_SETUP_DMA_OPS
select ARCH_HAS_SET_DIRECT_MAP
select ARCH_HAS_SET_MEMORY

1
arch/x86/Kconfig
View File

@ -88,6 +88,7 @@ config X86
select ARCH_HAS_PMEM_API if X86_64
select ARCH_HAS_PTE_DEVMAP if X86_64
select ARCH_HAS_PTE_SPECIAL
select ARCH_HAS_HW_PTE_YOUNG
select ARCH_HAS_NONLEAF_PMD_YOUNG if PGTABLE_LEVELS > 2
select ARCH_HAS_UACCESS_FLUSHCACHE if X86_64
select ARCH_HAS_COPY_MC if X86_64

6
arch/x86/include/asm/pgtable.h
View File

@ -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);

2
include/linux/pgtable.h
View File

@ -375,7 +375,7 @@ static inline bool arch_has_hw_nonleaf_pmd_young(void)
*/
static inline bool arch_has_hw_pte_young(void)
{
return false;
return IS_ENABLED(CONFIG_ARCH_HAS_HW_PTE_YOUNG);
}
#endif