From 2840eec439f3e1788047259d10994b555020de40 Mon Sep 17 00:00:00 2001 From: Thomas Gleixner Date: Tue, 3 Nov 2020 10:27:31 +0100 Subject: [PATCH 042/323] mm/highmem: Remove the old kmap_atomic cruft Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/5.10/older/patches-5.10.204-rt100.tar.xz All users gone. Signed-off-by: Thomas Gleixner Signed-off-by: Sebastian Andrzej Siewior --- 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 a5ce45dceae0..e632774cce87 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 77677c6844f7..499dfafd36b7 100644 --- a/mm/highmem.c +++ b/mm/highmem.c @@ -31,12 +31,6 @@ #include #include -#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 -- 2.43.0