[tip: core/mm] mm/highmem: Remove the old kmap_atomic cruft

[tip-bot2 for Thomas Gleixner]

The following commit has been merged into the core/mm branch of tip:

Commit-ID:     3c1016b53c311906878c703af1e2b29855a9a962
Gitweb:        https://git.kernel.org/tip/3c1016b53c311906878c703af1e2b29855a9a962
Author:        Thomas Gleixner <tglx@xxxxxxxxxxxxx>
AuthorDate:    Tue, 03 Nov 2020 10:27:31 +01:00
Committer:     Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CommitterDate: Fri, 06 Nov 2020 23:14:58 +01:00

mm/highmem: Remove the old kmap_atomic cruft

All users gone.

Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Arnd Bergmann <arnd@xxxxxxxx>
Link: https://lore.kernel.org/r/20201103095858.516281567@xxxxxxxxxxxxx

---
 include/linux/highmem.h | 63 ++--------------------------------------
 mm/highmem.c            |  7 +----
 2 files changed, 5 insertions(+), 65 deletions(-)

diff --git a/include/linux/highmem.h b/include/linux/highmem.h
index de78869..3180a8f 100644
--- a/include/linux/highmem.h
+++ b/include/linux/highmem.h
@@ -86,31 +86,16 @@ static inline void kunmap(struct page *page)
  * be used in IRQ contexts, so in some (very limited) cases we need
  * it.
  */
-
-#ifndef CONFIG_KMAP_LOCAL
-void *kmap_atomic_high_prot(struct page *page, pgprot_t prot);
-void kunmap_atomic_high(void *kvaddr);
-
 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);
-}
-
-static inline void __kunmap_atomic(void *vaddr)
-{
-	kunmap_atomic_high(vaddr);
+	return __kmap_local_page_prot(page, prot);
 }
-#else /* !CONFIG_KMAP_LOCAL */
 
-static inline void *kmap_atomic_prot(struct page *page, pgprot_t prot)
+static inline void *kmap_atomic(struct page *page)
 {
-	preempt_disable();
-	pagefault_disable();
-	return __kmap_local_page_prot(page, prot);
+	return kmap_atomic_prot(page, kmap_prot);
 }
 
 static inline void *kmap_atomic_pfn(unsigned long pfn)
@@ -125,13 +110,6 @@ static inline void __kunmap_atomic(void *addr)
 	kunmap_local_indexed(addr);
 }
 
-#endif /* CONFIG_KMAP_LOCAL */
-
-static inline void *kmap_atomic(struct page *page)
-{
-	return kmap_atomic_prot(page, kmap_prot);
-}
-
 /* declarations for linux/mm/highmem.c */
 unsigned int nr_free_highpages(void);
 extern atomic_long_t _totalhigh_pages;
@@ -212,41 +190,8 @@ static inline void __kunmap_atomic(void *addr)
 
 #define kmap_flush_unused()	do {} while(0)
 
-#endif /* CONFIG_HIGHMEM */
-
-#if !defined(CONFIG_KMAP_LOCAL)
-#if defined(CONFIG_HIGHMEM)
-
-DECLARE_PER_CPU(int, __kmap_atomic_idx);
-
-static inline int kmap_atomic_idx_push(void)
-{
-	int idx = __this_cpu_inc_return(__kmap_atomic_idx) - 1;
-
-#ifdef CONFIG_DEBUG_HIGHMEM
-	WARN_ON_ONCE(in_irq() && !irqs_disabled());
-	BUG_ON(idx >= KM_TYPE_NR);
-#endif
-	return idx;
-}
-
-static inline int kmap_atomic_idx(void)
-{
-	return __this_cpu_read(__kmap_atomic_idx) - 1;
-}
 
-static inline void kmap_atomic_idx_pop(void)
-{
-#ifdef CONFIG_DEBUG_HIGHMEM
-	int idx = __this_cpu_dec_return(__kmap_atomic_idx);
-
-	BUG_ON(idx < 0);
-#else
-	__this_cpu_dec(__kmap_atomic_idx);
-#endif
-}
-#endif
-#endif
+#endif /* CONFIG_HIGHMEM */
 
 /*
  * Prevent people trying to call kunmap_atomic() as if it were kunmap()
diff --git a/mm/highmem.c b/mm/highmem.c
index 77677c6..499dfaf 100644
--- a/mm/highmem.c
+++ b/mm/highmem.c
@@ -31,12 +31,6 @@
 #include <asm/tlbflush.h>
 #include <linux/vmalloc.h>
 
-#ifndef CONFIG_KMAP_LOCAL
-#ifdef CONFIG_HIGHMEM
-DEFINE_PER_CPU(int, __kmap_atomic_idx);
-#endif
-#endif
-
 /*
  * Virtual_count is not a pure "count".
  *  0 means that it is not mapped, and has not been mapped
@@ -410,6 +404,7 @@ static inline void kmap_local_idx_pop(void)
 #ifndef arch_kmap_local_post_map
 # define arch_kmap_local_post_map(vaddr, pteval)	do { } while (0)
 #endif
+
 #ifndef arch_kmap_local_pre_unmap
 # define arch_kmap_local_pre_unmap(vaddr)		do { } while (0)
 #endif