[PATCH V2 05/11] {x86,powerpc,microblaze}/kmap: Move preempt disable

ira.weiny
2020-05-04T01:09:29Z

From: Ira Weiny <ira.weiny@intel.com>

During this kmap() conversion series we must maintain bisect-ability.
To do this, kmap_atomic_prot() in x86, powerpc, and microblaze need to
remain functional.

Create a temporary inline version of kmap_atomic_prot within these
architectures so we can rework their kmap_atomic() calls and then lift
kmap_atomic_prot() to the core.

Signed-off-by: Ira Weiny <ira.weiny@intel.com>

---
Changes from V1:
New patch
---
arch/microblaze/include/asm/highmem.h | 11 ++++++++++-
arch/microblaze/mm/highmem.c | 10 ++--------
arch/powerpc/include/asm/highmem.h | 11 ++++++++++-
arch/powerpc/mm/highmem.c | 9 ++-------
arch/x86/include/asm/highmem.h | 11 ++++++++++-
arch/x86/mm/highmem_32.c | 10 ++--------
6 files changed, 36 insertions(+), 26 deletions(-)

diff --git a/arch/microblaze/include/asm/highmem.h b/arch/microblaze/include/asm/highmem.h
index 0c94046f2d58..ec9954b091e1 100644
--- a/arch/microblaze/include/asm/highmem.h
+++ b/arch/microblaze/include/asm/highmem.h
@@ -51,7 +51,16 @@ extern pte_t *pkmap_page_table;
#define PKMAP_NR(virt) ((virt - PKMAP_BASE) >> PAGE_SHIFT)
#define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << PAGE_SHIFT))

-extern void *kmap_atomic_prot(struct page *page, pgprot_t prot);
+extern void *kmap_atomic_high_prot(struct page *page, pgprot_t prot);
+void *kmap_atomic_prot(struct page *page, pgprot_t prot)
+{
+ preempt_disable();
+ pagefault_disable();
+ if (!PageHighMem(page))
+ return page_address(page);
+
+ return kmap_atomic_high_prot(page, prot);
+}
extern void __kunmap_atomic(void *kvaddr);

static inline void *kmap_atomic(struct page *page)
diff --git a/arch/microblaze/mm/highmem.c b/arch/microblaze/mm/highmem.c
index d7569f77fa15..0e3efaa8a004 100644
--- a/arch/microblaze/mm/highmem.c
+++ b/arch/microblaze/mm/highmem.c
@@ -32,18 +32,12 @@
*/
#include <asm/tlbflush.h>

-void *kmap_atomic_prot(struct page *page, pgprot_t prot)
+void *kmap_atomic_high_prot(struct page *page, pgprot_t prot)
{

unsigned long vaddr;
int idx, type;

- preempt_disable();
- pagefault_disable();
- if (!PageHighMem(page))
- return page_address(page);
-
-
type = kmap_atomic_idx_push();
idx = type + KM_TYPE_NR*smp_processor_id();
vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx);
@@ -55,7 +49,7 @@ void *kmap_atomic_prot(struct page *page, pgprot_t prot)

return (void *) vaddr;
}
-EXPORT_SYMBOL(kmap_atomic_prot);
+EXPORT_SYMBOL(kmap_atomic_high_prot);

void __kunmap_atomic(void *kvaddr)
{
diff --git a/arch/powerpc/include/asm/highmem.h b/arch/powerpc/include/asm/highmem.h
index ba3371977d49..d049806a8354 100644
--- a/arch/powerpc/include/asm/highmem.h
+++ b/arch/powerpc/include/asm/highmem.h
@@ -59,7 +59,16 @@ extern pte_t *pkmap_page_table;
#define PKMAP_NR(virt) ((virt-PKMAP_BASE) >> PAGE_SHIFT)
#define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << PAGE_SHIFT))

-extern void *kmap_atomic_prot(struct page *page, pgprot_t prot);
+extern void *kmap_atomic_high_prot(struct page *page, pgprot_t prot);
+static inline void *kmap_atomic_prot(struct page *page, pgprot_t prot)
+{
+ preempt_disable();
+ pagefault_disable();
+ if (!PageHighMem(page))
+ return page_address(page);
+
+ return kmap_atomic_high_prot(page, prot);
+}
extern void __kunmap_atomic(void *kvaddr);

static inline void *kmap_atomic(struct page *page)
diff --git a/arch/powerpc/mm/highmem.c b/arch/powerpc/mm/highmem.c
index 320c1672b2ae..f075cef6d663 100644
--- a/arch/powerpc/mm/highmem.c
+++ b/arch/powerpc/mm/highmem.c
@@ -30,16 +30,11 @@
* be used in IRQ contexts, so in some (very limited) cases we need
* it.
*/
-void *kmap_atomic_prot(struct page *page, pgprot_t prot)
+void *kmap_atomic_high_prot(struct page *page, pgprot_t prot)
{
unsigned long vaddr;
int idx, type;

- preempt_disable();
- pagefault_disable();
- if (!PageHighMem(page))
- return page_address(page);
-
type = kmap_atomic_idx_push();
idx = type + KM_TYPE_NR*smp_processor_id();
vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx);
@@ -49,7 +44,7 @@ void *kmap_atomic_prot(struct page *page, pgprot_t prot)

return (void*) vaddr;
}
-EXPORT_SYMBOL(kmap_atomic_prot);
+EXPORT_SYMBOL(kmap_atomic_high_prot);

void __kunmap_atomic(void *kvaddr)
{
diff --git a/arch/x86/include/asm/highmem.h b/arch/x86/include/asm/highmem.h
index 90b96594d6c5..61f47fef40e5 100644
--- a/arch/x86/include/asm/highmem.h
+++ b/arch/x86/include/asm/highmem.h
@@ -58,7 +58,16 @@ extern unsigned long highstart_pfn, highend_pfn;
#define PKMAP_NR(virt) ((virt-PKMAP_BASE) >> PAGE_SHIFT)
#define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << PAGE_SHIFT))

-void *kmap_atomic_prot(struct page *page, pgprot_t prot);
+extern void *kmap_atomic_high_prot(struct page *page, pgprot_t prot);
+static inline void *kmap_atomic_prot(struct page *page, pgprot_t prot)
+{
+ preempt_disable();
+ pagefault_disable();
+ if (!PageHighMem(page))
+ return page_address(page);
+
+ return kmap_atomic_high_prot(page, prot);
+}
void *kmap_atomic(struct page *page);
void __kunmap_atomic(void *kvaddr);
void *kmap_atomic_pfn(unsigned long pfn);
diff --git a/arch/x86/mm/highmem_32.c b/arch/x86/mm/highmem_32.c
index c4ebfd0ae401..48b56b1af902 100644
--- a/arch/x86/mm/highmem_32.c
+++ b/arch/x86/mm/highmem_32.c
@@ -12,17 +12,11 @@
* However when holding an atomic kmap it is not legal to sleep, so atomic
* kmaps are appropriate for short, tight code paths only.
*/
-void *kmap_atomic_prot(struct page *page, pgprot_t prot)
+void *kmap_atomic_high_prot(struct page *page, pgprot_t prot)
{
unsigned long vaddr;
int idx, type;

- preempt_disable();
- pagefault_disable();
-
- if (!PageHighMem(page))
- return page_address(page);
-
type = kmap_atomic_idx_push();
idx = type + KM_TYPE_NR*smp_processor_id();
vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx);
@@ -32,7 +26,7 @@ void *kmap_atomic_prot(struct page *page, pgprot_t prot)

return (void *)vaddr;
}
-EXPORT_SYMBOL(kmap_atomic_prot);
+EXPORT_SYMBOL(kmap_atomic_high_prot);

void *kmap_atomic(struct page *page)
{
--
2.25.1