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x86: remove PG_uncached

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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) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Matthew Wilcox (Oracle) 2024-08-21 20:34:43 +01:00 committed by Andrew Morton
parent 02e1960aaf
commit 7a87225ae2
11 changed files with 31 additions and 76 deletions
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30
Documentation/features/vm/PG_uncached/arch-support.txt
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@ -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 |
-----------------------

3
arch/arm64/Kconfig
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@ -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

5
arch/x86/Kconfig
View File

@ -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

8
arch/x86/mm/pat/memtype.c
View File

@ -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)

8
fs/proc/page.c
View File

@ -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

1
include/linux/kernel-page-flags.h
View File

@ -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

13
include/linux/page-flags.h
View File

@ -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)

23
include/trace/events/mmflags.h
View File

@ -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, "|", \

9
mm/Kconfig
View File

@ -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

4
mm/huge_memory.c
View File

@ -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) |

3
tools/mm/page-types.c
View File

@ -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",