From 7a87225ae2c6c317c7b80cf599e5cf0eee699196 Mon Sep 17 00:00:00 2001 From: "Matthew Wilcox (Oracle)" Date: Wed, 21 Aug 2024 20:34:43 +0100 Subject: [PATCH] x86: remove PG_uncached Convert x86 to use PG_arch_2 instead of PG_uncached and remove PG_uncached. Link: https://lkml.kernel.org/r/20240821193445.2294269-11-willy@infradead.org Signed-off-by: Matthew Wilcox (Oracle) Signed-off-by: Andrew Morton --- .../features/vm/PG_uncached/arch-support.txt | 30 ------------------- arch/arm64/Kconfig | 3 +- arch/x86/Kconfig | 5 +--- arch/x86/mm/pat/memtype.c | 8 ++--- fs/proc/page.c | 8 ++--- include/linux/kernel-page-flags.h | 1 - include/linux/page-flags.h | 13 ++------ include/trace/events/mmflags.h | 23 +++++++------- mm/Kconfig | 9 ++---- mm/huge_memory.c | 4 ++- tools/mm/page-types.c | 3 +- 11 files changed, 31 insertions(+), 76 deletions(-) delete mode 100644 Documentation/features/vm/PG_uncached/arch-support.txt diff --git a/Documentation/features/vm/PG_uncached/arch-support.txt b/Documentation/features/vm/PG_uncached/arch-support.txt deleted file mode 100644 index 5a7508b8c967..000000000000 --- a/Documentation/features/vm/PG_uncached/arch-support.txt +++ /dev/null @@ -1,30 +0,0 @@ -# -# Feature name: PG_uncached -# Kconfig: ARCH_USES_PG_UNCACHED -# description: arch supports the PG_uncached page flag -# - ----------------------- - | arch |status| - ----------------------- - | alpha: | TODO | - | arc: | TODO | - | arm: | TODO | - | arm64: | TODO | - | csky: | TODO | - | hexagon: | TODO | - | loongarch: | TODO | - | m68k: | TODO | - | microblaze: | TODO | - | mips: | TODO | - | nios2: | TODO | - | openrisc: | TODO | - | parisc: | TODO | - | powerpc: | TODO | - | riscv: | TODO | - | s390: | TODO | - | sh: | TODO | - | sparc: | TODO | - | um: | TODO | - | x86: | ok | - | xtensa: | TODO | - ----------------------- diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index a2f8ff354ca6..6494848019a0 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -2100,7 +2100,8 @@ config ARM64_MTE depends on ARM64_PAN select ARCH_HAS_SUBPAGE_FAULTS select ARCH_USES_HIGH_VMA_FLAGS - select ARCH_USES_PG_ARCH_X + select ARCH_USES_PG_ARCH_2 + select ARCH_USES_PG_ARCH_3 help Memory Tagging (part of the ARMv8.5 Extensions) provides architectural support for run-time, always-on detection of diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index acd9745bf2ae..b74b9ee484da 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -1799,6 +1799,7 @@ config X86_PAT def_bool y prompt "x86 PAT support" if EXPERT depends on MTRR + select ARCH_USES_PG_ARCH_2 help Use PAT attributes to setup page level cache control. @@ -1810,10 +1811,6 @@ config X86_PAT If unsure, say Y. -config ARCH_USES_PG_UNCACHED - def_bool y - depends on X86_PAT - config X86_UMIP def_bool y prompt "User Mode Instruction Prevention" if EXPERT diff --git a/arch/x86/mm/pat/memtype.c b/arch/x86/mm/pat/memtype.c index bdc2a240c2aa..1fa0bf6ed295 100644 --- a/arch/x86/mm/pat/memtype.c +++ b/arch/x86/mm/pat/memtype.c @@ -104,7 +104,7 @@ __setup("debugpat", pat_debug_setup); #ifdef CONFIG_X86_PAT /* - * X86 PAT uses page flags arch_1 and uncached together to keep track of + * X86 PAT uses page flags arch_1 and arch_2 together to keep track of * memory type of pages that have backing page struct. * * X86 PAT supports 4 different memory types: @@ -118,9 +118,9 @@ __setup("debugpat", pat_debug_setup); #define _PGMT_WB 0 #define _PGMT_WC (1UL << PG_arch_1) -#define _PGMT_UC_MINUS (1UL << PG_uncached) -#define _PGMT_WT (1UL << PG_uncached | 1UL << PG_arch_1) -#define _PGMT_MASK (1UL << PG_uncached | 1UL << PG_arch_1) +#define _PGMT_UC_MINUS (1UL << PG_arch_2) +#define _PGMT_WT (1UL << PG_arch_2 | 1UL << PG_arch_1) +#define _PGMT_MASK (1UL << PG_arch_2 | 1UL << PG_arch_1) #define _PGMT_CLEAR_MASK (~_PGMT_MASK) static inline enum page_cache_mode get_page_memtype(struct page *pg) diff --git a/fs/proc/page.c b/fs/proc/page.c index e74e639893be..a55f5acefa97 100644 --- a/fs/proc/page.c +++ b/fs/proc/page.c @@ -206,18 +206,16 @@ u64 stable_page_flags(const struct page *page) u |= kpf_copy_bit(page->flags, KPF_HWPOISON, PG_hwpoison); #endif -#ifdef CONFIG_ARCH_USES_PG_UNCACHED - u |= kpf_copy_bit(k, KPF_UNCACHED, PG_uncached); -#endif - u |= kpf_copy_bit(k, KPF_RESERVED, PG_reserved); u |= kpf_copy_bit(k, KPF_OWNER_2, PG_owner_2); u |= kpf_copy_bit(k, KPF_PRIVATE, PG_private); u |= kpf_copy_bit(k, KPF_PRIVATE_2, PG_private_2); u |= kpf_copy_bit(k, KPF_OWNER_PRIVATE, PG_owner_priv_1); u |= kpf_copy_bit(k, KPF_ARCH, PG_arch_1); -#ifdef CONFIG_ARCH_USES_PG_ARCH_X +#ifdef CONFIG_ARCH_USES_PG_ARCH_2 u |= kpf_copy_bit(k, KPF_ARCH_2, PG_arch_2); +#endif +#ifdef CONFIG_ARCH_USES_PG_ARCH_3 u |= kpf_copy_bit(k, KPF_ARCH_3, PG_arch_3); #endif diff --git a/include/linux/kernel-page-flags.h b/include/linux/kernel-page-flags.h index 7c587a711be1..196778a087c4 100644 --- a/include/linux/kernel-page-flags.h +++ b/include/linux/kernel-page-flags.h @@ -15,7 +15,6 @@ #define KPF_PRIVATE_2 36 #define KPF_OWNER_PRIVATE 37 #define KPF_ARCH 38 -#define KPF_UNCACHED 39 #define KPF_SOFTDIRTY 40 #define KPF_ARCH_2 41 #define KPF_ARCH_3 42 diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h index 1ff3d172c22c..2175ebceb41c 100644 --- a/include/linux/page-flags.h +++ b/include/linux/page-flags.h @@ -113,9 +113,6 @@ enum pageflags { #ifdef CONFIG_MMU PG_mlocked, /* Page is vma mlocked */ #endif -#ifdef CONFIG_ARCH_USES_PG_UNCACHED - PG_uncached, /* Page has been mapped as uncached */ -#endif #ifdef CONFIG_MEMORY_FAILURE PG_hwpoison, /* hardware poisoned page. Don't touch */ #endif @@ -123,8 +120,10 @@ enum pageflags { PG_young, PG_idle, #endif -#ifdef CONFIG_ARCH_USES_PG_ARCH_X +#ifdef CONFIG_ARCH_USES_PG_ARCH_2 PG_arch_2, +#endif +#ifdef CONFIG_ARCH_USES_PG_ARCH_3 PG_arch_3, #endif __NR_PAGEFLAGS, @@ -602,12 +601,6 @@ FOLIO_FLAG_FALSE(mlocked) FOLIO_TEST_SET_FLAG_FALSE(mlocked) #endif -#ifdef CONFIG_ARCH_USES_PG_UNCACHED -PAGEFLAG(Uncached, uncached, PF_NO_COMPOUND) -#else -PAGEFLAG_FALSE(Uncached, uncached) -#endif - #ifdef CONFIG_MEMORY_FAILURE PAGEFLAG(HWPoison, hwpoison, PF_ANY) TESTSCFLAG(HWPoison, hwpoison, PF_ANY) diff --git a/include/trace/events/mmflags.h b/include/trace/events/mmflags.h index 3b51558cdc9b..58f2699331b6 100644 --- a/include/trace/events/mmflags.h +++ b/include/trace/events/mmflags.h @@ -71,12 +71,6 @@ #define IF_HAVE_PG_MLOCK(_name) #endif -#ifdef CONFIG_ARCH_USES_PG_UNCACHED -#define IF_HAVE_PG_UNCACHED(_name) ,{1UL << PG_##_name, __stringify(_name)} -#else -#define IF_HAVE_PG_UNCACHED(_name) -#endif - #ifdef CONFIG_MEMORY_FAILURE #define IF_HAVE_PG_HWPOISON(_name) ,{1UL << PG_##_name, __stringify(_name)} #else @@ -89,10 +83,16 @@ #define IF_HAVE_PG_IDLE(_name) #endif -#ifdef CONFIG_ARCH_USES_PG_ARCH_X -#define IF_HAVE_PG_ARCH_X(_name) ,{1UL << PG_##_name, __stringify(_name)} +#ifdef CONFIG_ARCH_USES_PG_ARCH_2 +#define IF_HAVE_PG_ARCH_2(_name) ,{1UL << PG_##_name, __stringify(_name)} #else -#define IF_HAVE_PG_ARCH_X(_name) +#define IF_HAVE_PG_ARCH_2(_name) +#endif + +#ifdef CONFIG_ARCH_USES_PG_ARCH_3 +#define IF_HAVE_PG_ARCH_3(_name) ,{1UL << PG_##_name, __stringify(_name)} +#else +#define IF_HAVE_PG_ARCH_3(_name) #endif #define DEF_PAGEFLAG_NAME(_name) { 1UL << PG_##_name, __stringify(_name) } @@ -118,12 +118,11 @@ DEF_PAGEFLAG_NAME(swapbacked), \ DEF_PAGEFLAG_NAME(unevictable) \ IF_HAVE_PG_MLOCK(mlocked) \ -IF_HAVE_PG_UNCACHED(uncached) \ IF_HAVE_PG_HWPOISON(hwpoison) \ IF_HAVE_PG_IDLE(idle) \ IF_HAVE_PG_IDLE(young) \ -IF_HAVE_PG_ARCH_X(arch_2) \ -IF_HAVE_PG_ARCH_X(arch_3) +IF_HAVE_PG_ARCH_2(arch_2) \ +IF_HAVE_PG_ARCH_3(arch_3) #define show_page_flags(flags) \ (flags) ? __print_flags(flags, "|", \ diff --git a/mm/Kconfig b/mm/Kconfig index 5946dcdcaeda..8078a4b3c509 100644 --- a/mm/Kconfig +++ b/mm/Kconfig @@ -1079,13 +1079,10 @@ config ARCH_USES_HIGH_VMA_FLAGS config ARCH_HAS_PKEYS bool -config ARCH_USES_PG_ARCH_X +config ARCH_USES_PG_ARCH_2 + bool +config ARCH_USES_PG_ARCH_3 bool - help - Enable the definition of PG_arch_x page flags with x > 1. Only - suitable for 64-bit architectures with CONFIG_FLATMEM or - CONFIG_SPARSEMEM_VMEMMAP enabled, otherwise there may not be - enough room for additional bits in page->flags. config VM_EVENT_COUNTERS default y diff --git a/mm/huge_memory.c b/mm/huge_memory.c index 8dfb912ebdaa..c4b45ad576f6 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -2993,8 +2993,10 @@ static void __split_huge_page_tail(struct folio *folio, int tail, (1L << PG_workingset) | (1L << PG_locked) | (1L << PG_unevictable) | -#ifdef CONFIG_ARCH_USES_PG_ARCH_X +#ifdef CONFIG_ARCH_USES_PG_ARCH_2 (1L << PG_arch_2) | +#endif +#ifdef CONFIG_ARCH_USES_PG_ARCH_3 (1L << PG_arch_3) | #endif (1L << PG_dirty) | diff --git a/tools/mm/page-types.c b/tools/mm/page-types.c index 8ca41c41105e..fa050d5a48cd 100644 --- a/tools/mm/page-types.c +++ b/tools/mm/page-types.c @@ -76,7 +76,7 @@ #define KPF_PRIVATE_2 36 #define KPF_OWNER_PRIVATE 37 #define KPF_ARCH 38 -#define KPF_UNCACHED 39 +#define KPF_UNCACHED 39 /* unused */ #define KPF_SOFTDIRTY 40 #define KPF_ARCH_2 41 @@ -134,7 +134,6 @@ static const char * const page_flag_names[] = { [KPF_PRIVATE_2] = "p:private_2", [KPF_OWNER_PRIVATE] = "O:owner_private", [KPF_ARCH] = "h:arch", - [KPF_UNCACHED] = "c:uncached", [KPF_SOFTDIRTY] = "f:softdirty", [KPF_ARCH_2] = "H:arch_2",