Introduce utility functions setting the foundation for ptdescs. These
will also assist in the splitting out of ptdesc from struct page.
ptdesc_alloc() is defined to allocate new ptdesc pages as compound
pages. This is to standardize ptdescs by allowing for one allocation
and one free function, in contrast to 2 allocation and 2 free functions.
Signed-off-by: Vishal Moola (Oracle) <vishal.moola@gmail.com>
---
include/asm-generic/tlb.h | 11 ++++++++++
include/linux/mm.h | 44 +++++++++++++++++++++++++++++++++++++++
include/linux/pgtable.h | 13 ++++++++++++
3 files changed, 68 insertions(+)
diff --git a/include/asm-generic/tlb.h b/include/asm-generic/tlb.h
index b46617207c93..6bade9e0e799 100644
--- a/include/asm-generic/tlb.h
+++ b/include/asm-generic/tlb.h
@@ -481,6 +481,17 @@ static inline void tlb_remove_page(struct mmu_gather *tlb, struct page *page)
return tlb_remove_page_size(tlb, page, PAGE_SIZE);
}
+static inline void tlb_remove_ptdesc(struct mmu_gather *tlb, void *pt)
+{
+ tlb_remove_table(tlb, pt);
+}
+
+/* Like tlb_remove_ptdesc, but for page-like page directories. */
+static inline void tlb_remove_page_ptdesc(struct mmu_gather *tlb, struct ptdesc *pt)
+{
+ tlb_remove_page(tlb, ptdesc_page(pt));
+}
+
static inline void tlb_change_page_size(struct mmu_gather *tlb,
unsigned int page_size)
{
diff --git a/include/linux/mm.h b/include/linux/mm.h
index b18848ae7e22..ec3cbe2fa665 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -2744,6 +2744,45 @@ static inline pmd_t *pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long a
}
#endif /* CONFIG_MMU */
+static inline struct ptdesc *virt_to_ptdesc(const void *x)
+{
+ return page_ptdesc(virt_to_head_page(x));
+}
+
+static inline void *ptdesc_to_virt(struct ptdesc *pt)
+{
+ return page_to_virt(ptdesc_page(pt));
+}
+
+static inline void *ptdesc_address(struct ptdesc *pt)
+{
+ return folio_address(ptdesc_folio(pt));
+}
+
+static inline bool ptdesc_is_reserved(struct ptdesc *pt)
+{
+ return folio_test_reserved(ptdesc_folio(pt));
+}
+
+static inline struct ptdesc *ptdesc_alloc(gfp_t gfp, unsigned int order)
+{
+ struct page *page = alloc_pages(gfp | __GFP_COMP, order);
+
+ return page_ptdesc(page);
+}
+
+static inline void ptdesc_free(struct ptdesc *pt)
+{
+ struct page *page = ptdesc_page(pt);
+
+ __free_pages(page, compound_order(page));
+}
+
+static inline void ptdesc_clear(void *x)
+{
+ clear_page(x);
+}
+
#if USE_SPLIT_PTE_PTLOCKS
#if ALLOC_SPLIT_PTLOCKS
void __init ptlock_cache_init(void);
@@ -2970,6 +3009,11 @@ static inline void mark_page_reserved(struct page *page)
adjust_managed_page_count(page, -1);
}
+static inline void free_reserved_ptdesc(struct ptdesc *pt)
+{
+ free_reserved_page(ptdesc_page(pt));
+}
+
/*
* Default method to free all the __init memory into the buddy system.
* The freed pages will be poisoned with pattern "poison" if it's within
diff --git a/include/linux/pgtable.h b/include/linux/pgtable.h
index 7cc6ea057ee9..7cd803aa38eb 100644
--- a/include/linux/pgtable.h
+++ b/include/linux/pgtable.h
@@ -97,6 +97,19 @@ TABLE_MATCH(ptl, ptl);
#undef TABLE_MATCH
static_assert(sizeof(struct ptdesc) <= sizeof(struct page));
+#define ptdesc_page(pt) (_Generic((pt), \
+ const struct ptdesc *: (const struct page *)(pt), \
+ struct ptdesc *: (struct page *)(pt)))
+
+#define ptdesc_folio(pt) (_Generic((pt), \
+ const struct ptdesc *: (const struct folio *)(pt), \
+ struct ptdesc *: (struct folio *)(pt)))
+
+static inline struct ptdesc *page_ptdesc(struct page *page)
+{
+ return (struct ptdesc *)page;
+}
+
/*
* A page table page can be thought of an array like this: pXd_t[PTRS_PER_PxD]
*
--
2.39.2On Mon, Apr 17, 2023 at 01:50:19PM -0700, Vishal Moola wrote:
> Introduce utility functions setting the foundation for ptdescs. These
> will also assist in the splitting out of ptdesc from struct page.
>
> ptdesc_alloc() is defined to allocate new ptdesc pages as compound
> pages. This is to standardize ptdescs by allowing for one allocation
> and one free function, in contrast to 2 allocation and 2 free functions.
>
> Signed-off-by: Vishal Moola (Oracle) <vishal.moola@gmail.com>
> ---
> include/asm-generic/tlb.h | 11 ++++++++++
> include/linux/mm.h | 44 +++++++++++++++++++++++++++++++++++++++
> include/linux/pgtable.h | 13 ++++++++++++
> 3 files changed, 68 insertions(+)
>
> diff --git a/include/asm-generic/tlb.h b/include/asm-generic/tlb.h
> index b46617207c93..6bade9e0e799 100644
> --- a/include/asm-generic/tlb.h
> +++ b/include/asm-generic/tlb.h
> @@ -481,6 +481,17 @@ static inline void tlb_remove_page(struct mmu_gather *tlb, struct page *page)
> return tlb_remove_page_size(tlb, page, PAGE_SIZE);
> }
>
> +static inline void tlb_remove_ptdesc(struct mmu_gather *tlb, void *pt)
> +{
> + tlb_remove_table(tlb, pt);
> +}
> +
> +/* Like tlb_remove_ptdesc, but for page-like page directories. */
> +static inline void tlb_remove_page_ptdesc(struct mmu_gather *tlb, struct ptdesc *pt)
> +{
> + tlb_remove_page(tlb, ptdesc_page(pt));
> +}
> +
> static inline void tlb_change_page_size(struct mmu_gather *tlb,
> unsigned int page_size)
> {
> diff --git a/include/linux/mm.h b/include/linux/mm.h
> index b18848ae7e22..ec3cbe2fa665 100644
> --- a/include/linux/mm.h
> +++ b/include/linux/mm.h
> @@ -2744,6 +2744,45 @@ static inline pmd_t *pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long a
> }
> #endif /* CONFIG_MMU */
>
> +static inline struct ptdesc *virt_to_ptdesc(const void *x)
> +{
> + return page_ptdesc(virt_to_head_page(x));
> +}
> +
> +static inline void *ptdesc_to_virt(struct ptdesc *pt)
> +{
> + return page_to_virt(ptdesc_page(pt));
> +}
> +
> +static inline void *ptdesc_address(struct ptdesc *pt)
> +{
> + return folio_address(ptdesc_folio(pt));
> +}
> +
> +static inline bool ptdesc_is_reserved(struct ptdesc *pt)
> +{
> + return folio_test_reserved(ptdesc_folio(pt));
> +}
> +
> +static inline struct ptdesc *ptdesc_alloc(gfp_t gfp, unsigned int order)
> +{
> + struct page *page = alloc_pages(gfp | __GFP_COMP, order);
> +
> + return page_ptdesc(page);
> +}
> +
> +static inline void ptdesc_free(struct ptdesc *pt)
> +{
> + struct page *page = ptdesc_page(pt);
> +
> + __free_pages(page, compound_order(page));
> +}
> +
> +static inline void ptdesc_clear(void *x)
> +{
> + clear_page(x);
> +}
> +
> #if USE_SPLIT_PTE_PTLOCKS
> #if ALLOC_SPLIT_PTLOCKS
> void __init ptlock_cache_init(void);
> @@ -2970,6 +3009,11 @@ static inline void mark_page_reserved(struct page *page)
> adjust_managed_page_count(page, -1);
> }
>
> +static inline void free_reserved_ptdesc(struct ptdesc *pt)
> +{
> + free_reserved_page(ptdesc_page(pt));
> +}
> +
> /*
> * Default method to free all the __init memory into the buddy system.
> * The freed pages will be poisoned with pattern "poison" if it's within
> diff --git a/include/linux/pgtable.h b/include/linux/pgtable.h
> index 7cc6ea057ee9..7cd803aa38eb 100644
> --- a/include/linux/pgtable.h
> +++ b/include/linux/pgtable.h
> @@ -97,6 +97,19 @@ TABLE_MATCH(ptl, ptl);
> #undef TABLE_MATCH
> static_assert(sizeof(struct ptdesc) <= sizeof(struct page));
>
> +#define ptdesc_page(pt) (_Generic((pt), \
> + const struct ptdesc *: (const struct page *)(pt), \
> + struct ptdesc *: (struct page *)(pt)))
> +
> +#define ptdesc_folio(pt) (_Generic((pt), \
> + const struct ptdesc *: (const struct folio *)(pt), \
> + struct ptdesc *: (struct folio *)(pt)))
> +
> +static inline struct ptdesc *page_ptdesc(struct page *page)
> +{
> + return (struct ptdesc *)page;
> +}
Hi Vishal,
I'm a little curious, why is the page_ptdesc() using inline functions instead of macro?
If this is any magic, please tell me, thank you very much.
> +
> /*
> * A page table page can be thought of an array like this: pXd_t[PTRS_PER_PxD]
> *
>
> --
> 2.39.2
>
On Wed, Apr 19, 2023 at 6:34 AM Vernon Yang <vernon2gm@gmail.com> wrote:
>
> On Mon, Apr 17, 2023 at 01:50:19PM -0700, Vishal Moola wrote:
> > Introduce utility functions setting the foundation for ptdescs. These
> > will also assist in the splitting out of ptdesc from struct page.
> >
> > ptdesc_alloc() is defined to allocate new ptdesc pages as compound
> > pages. This is to standardize ptdescs by allowing for one allocation
> > and one free function, in contrast to 2 allocation and 2 free functions.
> >
> > Signed-off-by: Vishal Moola (Oracle) <vishal.moola@gmail.com>
> > ---
> > include/asm-generic/tlb.h | 11 ++++++++++
> > include/linux/mm.h | 44 +++++++++++++++++++++++++++++++++++++++
> > include/linux/pgtable.h | 13 ++++++++++++
> > 3 files changed, 68 insertions(+)
> >
> > diff --git a/include/asm-generic/tlb.h b/include/asm-generic/tlb.h
> > index b46617207c93..6bade9e0e799 100644
> > --- a/include/asm-generic/tlb.h
> > +++ b/include/asm-generic/tlb.h
> > @@ -481,6 +481,17 @@ static inline void tlb_remove_page(struct mmu_gather *tlb, struct page *page)
> > return tlb_remove_page_size(tlb, page, PAGE_SIZE);
> > }
> >
> > +static inline void tlb_remove_ptdesc(struct mmu_gather *tlb, void *pt)
> > +{
> > + tlb_remove_table(tlb, pt);
> > +}
> > +
> > +/* Like tlb_remove_ptdesc, but for page-like page directories. */
> > +static inline void tlb_remove_page_ptdesc(struct mmu_gather *tlb, struct ptdesc *pt)
> > +{
> > + tlb_remove_page(tlb, ptdesc_page(pt));
> > +}
> > +
> > static inline void tlb_change_page_size(struct mmu_gather *tlb,
> > unsigned int page_size)
> > {
> > diff --git a/include/linux/mm.h b/include/linux/mm.h
> > index b18848ae7e22..ec3cbe2fa665 100644
> > --- a/include/linux/mm.h
> > +++ b/include/linux/mm.h
> > @@ -2744,6 +2744,45 @@ static inline pmd_t *pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long a
> > }
> > #endif /* CONFIG_MMU */
> >
> > +static inline struct ptdesc *virt_to_ptdesc(const void *x)
> > +{
> > + return page_ptdesc(virt_to_head_page(x));
> > +}
> > +
> > +static inline void *ptdesc_to_virt(struct ptdesc *pt)
> > +{
> > + return page_to_virt(ptdesc_page(pt));
> > +}
> > +
> > +static inline void *ptdesc_address(struct ptdesc *pt)
> > +{
> > + return folio_address(ptdesc_folio(pt));
> > +}
> > +
> > +static inline bool ptdesc_is_reserved(struct ptdesc *pt)
> > +{
> > + return folio_test_reserved(ptdesc_folio(pt));
> > +}
> > +
> > +static inline struct ptdesc *ptdesc_alloc(gfp_t gfp, unsigned int order)
> > +{
> > + struct page *page = alloc_pages(gfp | __GFP_COMP, order);
> > +
> > + return page_ptdesc(page);
> > +}
> > +
> > +static inline void ptdesc_free(struct ptdesc *pt)
> > +{
> > + struct page *page = ptdesc_page(pt);
> > +
> > + __free_pages(page, compound_order(page));
> > +}
> > +
> > +static inline void ptdesc_clear(void *x)
> > +{
> > + clear_page(x);
> > +}
> > +
> > #if USE_SPLIT_PTE_PTLOCKS
> > #if ALLOC_SPLIT_PTLOCKS
> > void __init ptlock_cache_init(void);
> > @@ -2970,6 +3009,11 @@ static inline void mark_page_reserved(struct page *page)
> > adjust_managed_page_count(page, -1);
> > }
> >
> > +static inline void free_reserved_ptdesc(struct ptdesc *pt)
> > +{
> > + free_reserved_page(ptdesc_page(pt));
> > +}
> > +
> > /*
> > * Default method to free all the __init memory into the buddy system.
> > * The freed pages will be poisoned with pattern "poison" if it's within
> > diff --git a/include/linux/pgtable.h b/include/linux/pgtable.h
> > index 7cc6ea057ee9..7cd803aa38eb 100644
> > --- a/include/linux/pgtable.h
> > +++ b/include/linux/pgtable.h
> > @@ -97,6 +97,19 @@ TABLE_MATCH(ptl, ptl);
> > #undef TABLE_MATCH
> > static_assert(sizeof(struct ptdesc) <= sizeof(struct page));
> >
> > +#define ptdesc_page(pt) (_Generic((pt), \
> > + const struct ptdesc *: (const struct page *)(pt), \
> > + struct ptdesc *: (struct page *)(pt)))
> > +
> > +#define ptdesc_folio(pt) (_Generic((pt), \
> > + const struct ptdesc *: (const struct folio *)(pt), \
> > + struct ptdesc *: (struct folio *)(pt)))
> > +
> > +static inline struct ptdesc *page_ptdesc(struct page *page)
> > +{
> > + return (struct ptdesc *)page;
> > +}
>
> Hi Vishal,
>
> I'm a little curious, why is the page_ptdesc() using inline functions instead of macro?
> If this is any magic, please tell me, thank you very much.
No magic here, I was mainly basing it off Matthew's netmem
series. I'm not too clear on when to use macros vs inlines
myself :/.
If there's a benefit to having it be a macro let me
know and I can make that change in v2.
Hi Vishal,
kernel test robot noticed the following build errors:
[auto build test ERROR on akpm-mm/mm-everything]
[also build test ERROR on s390/features powerpc/next powerpc/fixes geert-m68k/for-next geert-m68k/for-linus linus/master v6.3-rc7 next-20230417]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]
url: https://github.com/intel-lab-lkp/linux/commits/Vishal-Moola-Oracle/s390-Use-_pt_s390_gaddr-for-gmap-address-tracking/20230418-045832
base: https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
patch link: https://lore.kernel.org/r/20230417205048.15870-5-vishal.moola%40gmail.com
patch subject: [PATCH 04/33] mm: add utility functions for ptdesc
config: sh-allmodconfig (https://download.01.org/0day-ci/archive/20230418/202304180913.p1BuXrBb-lkp@intel.com/config)
compiler: sh4-linux-gcc (GCC) 12.1.0
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# https://github.com/intel-lab-lkp/linux/commit/1b6f8137ca50a543ad2937092836635ca58c78ce
git remote add linux-review https://github.com/intel-lab-lkp/linux
git fetch --no-tags linux-review Vishal-Moola-Oracle/s390-Use-_pt_s390_gaddr-for-gmap-address-tracking/20230418-045832
git checkout 1b6f8137ca50a543ad2937092836635ca58c78ce
# save the config file
mkdir build_dir && cp config build_dir/.config
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=sh olddefconfig
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=sh prepare
If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>
| Link: https://lore.kernel.org/oe-kbuild-all/202304180913.p1BuXrBb-lkp@intel.com/
All error/warnings (new ones prefixed by >>):
In file included from arch/sh/kernel/asm-offsets.c:14:
include/linux/mm.h: In function 'virt_to_ptdesc':
>> include/linux/mm.h:2723:16: error: implicit declaration of function 'page_ptdesc' [-Werror=implicit-function-declaration]
2723 | return page_ptdesc(virt_to_head_page(x));
| ^~~~~~~~~~~
>> include/linux/mm.h:2723:16: warning: returning 'int' from a function with return type 'struct ptdesc *' makes pointer from integer without a cast [-Wint-conversion]
2723 | return page_ptdesc(virt_to_head_page(x));
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from arch/sh/include/asm/thread_info.h:13,
from include/linux/thread_info.h:60,
from include/asm-generic/preempt.h:5,
from ./arch/sh/include/generated/asm/preempt.h:1,
from include/linux/preempt.h:78,
from include/linux/spinlock.h:56,
from include/linux/mmzone.h:8,
from include/linux/gfp.h:7,
from include/linux/mm.h:7:
include/linux/mm.h: In function 'ptdesc_to_virt':
>> include/linux/mm.h:2728:29: error: implicit declaration of function 'ptdesc_page'; did you mean 'pte_page'? [-Werror=implicit-function-declaration]
2728 | return page_to_virt(ptdesc_page(pt));
| ^~~~~~~~~~~
arch/sh/include/asm/page.h:139:27: note: in definition of macro '___va'
139 | #define ___va(x) ((x)+PAGE_OFFSET)
| ^
include/linux/mm.h:117:25: note: in expansion of macro '__va'
117 | #define page_to_virt(x) __va(PFN_PHYS(page_to_pfn(x)))
| ^~~~
include/linux/mm.h:117:30: note: in expansion of macro 'PFN_PHYS'
117 | #define page_to_virt(x) __va(PFN_PHYS(page_to_pfn(x)))
| ^~~~~~~~
include/asm-generic/memory_model.h:64:21: note: in expansion of macro '__page_to_pfn'
64 | #define page_to_pfn __page_to_pfn
| ^~~~~~~~~~~~~
include/linux/mm.h:2728:16: note: in expansion of macro 'page_to_virt'
2728 | return page_to_virt(ptdesc_page(pt));
| ^~~~~~~~~~~~
>> include/asm-generic/memory_model.h:46:35: warning: initialization of 'const struct page *' from 'int' makes pointer from integer without a cast [-Wint-conversion]
46 | ({ const struct page *__pg = (pg); \
| ^
arch/sh/include/asm/page.h:139:27: note: in definition of macro '___va'
139 | #define ___va(x) ((x)+PAGE_OFFSET)
| ^
include/linux/mm.h:117:25: note: in expansion of macro '__va'
117 | #define page_to_virt(x) __va(PFN_PHYS(page_to_pfn(x)))
| ^~~~
include/linux/mm.h:117:30: note: in expansion of macro 'PFN_PHYS'
117 | #define page_to_virt(x) __va(PFN_PHYS(page_to_pfn(x)))
| ^~~~~~~~
include/asm-generic/memory_model.h:64:21: note: in expansion of macro '__page_to_pfn'
64 | #define page_to_pfn __page_to_pfn
| ^~~~~~~~~~~~~
include/linux/mm.h:117:39: note: in expansion of macro 'page_to_pfn'
117 | #define page_to_virt(x) __va(PFN_PHYS(page_to_pfn(x)))
| ^~~~~~~~~~~
include/linux/mm.h:2728:16: note: in expansion of macro 'page_to_virt'
2728 | return page_to_virt(ptdesc_page(pt));
| ^~~~~~~~~~~~
include/linux/mm.h: In function 'ptdesc_address':
>> include/linux/mm.h:2733:30: error: implicit declaration of function 'ptdesc_folio'; did you mean 'page_folio'? [-Werror=implicit-function-declaration]
2733 | return folio_address(ptdesc_folio(pt));
| ^~~~~~~~~~~~
| page_folio
>> include/linux/mm.h:2733:30: warning: passing argument 1 of 'folio_address' makes pointer from integer without a cast [-Wint-conversion]
2733 | return folio_address(ptdesc_folio(pt));
| ^~~~~~~~~~~~~~~~
| |
| int
include/linux/mm.h:2151:55: note: expected 'const struct folio *' but argument is of type 'int'
2151 | static inline void *folio_address(const struct folio *folio)
| ~~~~~~~~~~~~~~~~~~~~^~~~~
include/linux/mm.h: In function 'ptdesc_is_reserved':
>> include/linux/mm.h:2738:36: warning: passing argument 1 of 'folio_test_reserved' makes pointer from integer without a cast [-Wint-conversion]
2738 | return folio_test_reserved(ptdesc_folio(pt));
| ^~~~~~~~~~~~~~~~
| |
| int
In file included from include/linux/mmzone.h:23:
include/linux/page-flags.h:375:62: note: expected 'struct folio *' but argument is of type 'int'
375 | static __always_inline bool folio_test_##lname(struct folio *folio) \
| ~~~~~~~~~~~~~~^~~~~
include/linux/page-flags.h:423:9: note: in expansion of macro 'TESTPAGEFLAG'
423 | TESTPAGEFLAG(uname, lname, policy) \
| ^~~~~~~~~~~~
include/linux/page-flags.h:494:1: note: in expansion of macro 'PAGEFLAG'
494 | PAGEFLAG(Reserved, reserved, PF_NO_COMPOUND)
| ^~~~~~~~
include/linux/mm.h: In function 'ptdesc_alloc':
include/linux/mm.h:2745:16: warning: returning 'int' from a function with return type 'struct ptdesc *' makes pointer from integer without a cast [-Wint-conversion]
2745 | return page_ptdesc(page);
| ^~~~~~~~~~~~~~~~~
include/linux/mm.h: In function 'ptdesc_free':
>> include/linux/mm.h:2750:29: warning: initialization of 'struct page *' from 'int' makes pointer from integer without a cast [-Wint-conversion]
2750 | struct page *page = ptdesc_page(pt);
| ^~~~~~~~~~~
include/linux/mm.h: In function 'free_reserved_ptdesc':
>> include/linux/mm.h:2988:28: warning: passing argument 1 of 'free_reserved_page' makes pointer from integer without a cast [-Wint-conversion]
2988 | free_reserved_page(ptdesc_page(pt));
| ^~~~~~~~~~~~~~~
| |
| int
include/linux/mm.h:2971:52: note: expected 'struct page *' but argument is of type 'int'
2971 | static inline void free_reserved_page(struct page *page)
| ~~~~~~~~~~~~~^~~~
cc1: some warnings being treated as errors
make[2]: *** [scripts/Makefile.build:114: arch/sh/kernel/asm-offsets.s] Error 1
make[2]: Target 'prepare' not remade because of errors.
make[1]: *** [Makefile:1286: prepare0] Error 2
make[1]: Target 'prepare' not remade because of errors.
make: *** [Makefile:226: __sub-make] Error 2
make: Target 'prepare' not remade because of errors.
vim +/page_ptdesc +2723 include/linux/mm.h
2720
2721 static inline struct ptdesc *virt_to_ptdesc(const void *x)
2722 {
> 2723 return page_ptdesc(virt_to_head_page(x));
2724 }
2725
2726 static inline void *ptdesc_to_virt(struct ptdesc *pt)
2727 {
> 2728 return page_to_virt(ptdesc_page(pt));
2729 }
2730
2731 static inline void *ptdesc_address(struct ptdesc *pt)
2732 {
> 2733 return folio_address(ptdesc_folio(pt));
2734 }
2735
2736 static inline bool ptdesc_is_reserved(struct ptdesc *pt)
2737 {
> 2738 return folio_test_reserved(ptdesc_folio(pt));
2739 }
2740
2741 static inline struct ptdesc *ptdesc_alloc(gfp_t gfp, unsigned int order)
2742 {
2743 struct page *page = alloc_pages(gfp | __GFP_COMP, order);
2744
2745 return page_ptdesc(page);
2746 }
2747
2748 static inline void ptdesc_free(struct ptdesc *pt)
2749 {
> 2750 struct page *page = ptdesc_page(pt);
2751
2752 __free_pages(page, compound_order(page));
2753 }
2754
--
0-DAY CI Kernel Test Service
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