From 01c4b788e01bfdb715de9a6763a7515da7a30a8f Mon Sep 17 00:00:00 2001 From: Ira Weiny Date: Thu, 4 Jun 2020 16:47:22 -0700 Subject: arch/kmap: remove BUG_ON() Patch series "Remove duplicated kmap code", v3. The kmap infrastructure has been copied almost verbatim to every architecture. This series consolidates obvious duplicated code by defining core functions which call into the architectures only when needed. Some of the k[un]map_atomic() implementations have some similarities but the similarities were not sufficient to warrant further changes. In addition we remove a duplicate implementation of kmap() in DRM. This patch (of 15): Replace the use of BUG_ON(in_interrupt()) in the kmap() and kunmap() in favor of might_sleep(). Besides the benefits of might_sleep(), this normalizes the implementations such that they can be made generic in subsequent patches. Signed-off-by: Ira Weiny Signed-off-by: Andrew Morton Reviewed-by: Dan Williams Reviewed-by: Christoph Hellwig Cc: Al Viro Cc: Christian König Cc: Daniel Vetter Cc: Thomas Bogendoerfer Cc: "James E.J. Bottomley" Cc: Helge Deller Cc: Benjamin Herrenschmidt Cc: Paul Mackerras Cc: "David S. Miller" Cc: Thomas Gleixner Cc: Ingo Molnar Cc: Borislav Petkov Cc: "H. Peter Anvin" Cc: Dave Hansen Cc: Andy Lutomirski Cc: Peter Zijlstra Cc: Chris Zankel Cc: Max Filippov Link: http://lkml.kernel.org/r/20200507150004.1423069-1-ira.weiny@intel.com Link: http://lkml.kernel.org/r/20200507150004.1423069-2-ira.weiny@intel.com Signed-off-by: Linus Torvalds --- arch/arc/include/asm/highmem.h | 2 +- arch/arc/mm/highmem.c | 2 +- arch/arm/mm/highmem.c | 2 +- arch/csky/mm/highmem.c | 2 +- arch/microblaze/include/asm/highmem.h | 2 +- arch/mips/mm/highmem.c | 2 +- arch/nds32/mm/highmem.c | 2 +- arch/powerpc/include/asm/highmem.h | 2 +- arch/sparc/include/asm/highmem.h | 4 ++-- arch/x86/mm/highmem_32.c | 3 +-- arch/xtensa/include/asm/highmem.h | 4 ++-- 11 files changed, 13 insertions(+), 14 deletions(-) (limited to 'arch') diff --git a/arch/arc/include/asm/highmem.h b/arch/arc/include/asm/highmem.h index 1af00accb37f..042e92921c4c 100644 --- a/arch/arc/include/asm/highmem.h +++ b/arch/arc/include/asm/highmem.h @@ -45,7 +45,7 @@ static inline void flush_cache_kmaps(void) static inline void kunmap(struct page *page) { - BUG_ON(in_interrupt()); + might_sleep(); if (!PageHighMem(page)) return; kunmap_high(page); diff --git a/arch/arc/mm/highmem.c b/arch/arc/mm/highmem.c index fc8849e4f72e..39ef7b9a3aa9 100644 --- a/arch/arc/mm/highmem.c +++ b/arch/arc/mm/highmem.c @@ -51,7 +51,7 @@ static pte_t * fixmap_page_table; void *kmap(struct page *page) { - BUG_ON(in_interrupt()); + might_sleep(); if (!PageHighMem(page)) return page_address(page); diff --git a/arch/arm/mm/highmem.c b/arch/arm/mm/highmem.c index a76f8ace9ce6..cc6eb79ef20c 100644 --- a/arch/arm/mm/highmem.c +++ b/arch/arm/mm/highmem.c @@ -42,7 +42,7 @@ EXPORT_SYMBOL(kmap); void kunmap(struct page *page) { - BUG_ON(in_interrupt()); + might_sleep(); if (!PageHighMem(page)) return; kunmap_high(page); diff --git a/arch/csky/mm/highmem.c b/arch/csky/mm/highmem.c index 813129145f3d..690d678649d1 100644 --- a/arch/csky/mm/highmem.c +++ b/arch/csky/mm/highmem.c @@ -29,7 +29,7 @@ EXPORT_SYMBOL(kmap); void kunmap(struct page *page) { - BUG_ON(in_interrupt()); + might_sleep(); if (!PageHighMem(page)) return; kunmap_high(page); diff --git a/arch/microblaze/include/asm/highmem.h b/arch/microblaze/include/asm/highmem.h index 332c78e15198..99ced7278b5c 100644 --- a/arch/microblaze/include/asm/highmem.h +++ b/arch/microblaze/include/asm/highmem.h @@ -66,7 +66,7 @@ static inline void *kmap(struct page *page) static inline void kunmap(struct page *page) { - BUG_ON(in_interrupt()); + might_sleep(); if (!PageHighMem(page)) return; kunmap_high(page); diff --git a/arch/mips/mm/highmem.c b/arch/mips/mm/highmem.c index d08e6d7d533b..edd889f6cede 100644 --- a/arch/mips/mm/highmem.c +++ b/arch/mips/mm/highmem.c @@ -28,7 +28,7 @@ EXPORT_SYMBOL(kmap); void kunmap(struct page *page) { - BUG_ON(in_interrupt()); + might_sleep(); if (!PageHighMem(page)) return; kunmap_high(page); diff --git a/arch/nds32/mm/highmem.c b/arch/nds32/mm/highmem.c index 022779af6148..4c7c28e994ea 100644 --- a/arch/nds32/mm/highmem.c +++ b/arch/nds32/mm/highmem.c @@ -24,7 +24,7 @@ EXPORT_SYMBOL(kmap); void kunmap(struct page *page) { - BUG_ON(in_interrupt()); + might_sleep(); if (!PageHighMem(page)) return; kunmap_high(page); diff --git a/arch/powerpc/include/asm/highmem.h b/arch/powerpc/include/asm/highmem.h index a4b65b186ec6..529512f6d65a 100644 --- a/arch/powerpc/include/asm/highmem.h +++ b/arch/powerpc/include/asm/highmem.h @@ -74,7 +74,7 @@ static inline void *kmap(struct page *page) static inline void kunmap(struct page *page) { - BUG_ON(in_interrupt()); + might_sleep(); if (!PageHighMem(page)) return; kunmap_high(page); diff --git a/arch/sparc/include/asm/highmem.h b/arch/sparc/include/asm/highmem.h index 18d776925c45..7dd2d4b3f980 100644 --- a/arch/sparc/include/asm/highmem.h +++ b/arch/sparc/include/asm/highmem.h @@ -55,7 +55,7 @@ void kunmap_high(struct page *page); static inline void *kmap(struct page *page) { - BUG_ON(in_interrupt()); + might_sleep(); if (!PageHighMem(page)) return page_address(page); return kmap_high(page); @@ -63,7 +63,7 @@ static inline void *kmap(struct page *page) static inline void kunmap(struct page *page) { - BUG_ON(in_interrupt()); + might_sleep(); if (!PageHighMem(page)) return; kunmap_high(page); diff --git a/arch/x86/mm/highmem_32.c b/arch/x86/mm/highmem_32.c index 0a1898b8552e..8af66382672b 100644 --- a/arch/x86/mm/highmem_32.c +++ b/arch/x86/mm/highmem_32.c @@ -15,8 +15,7 @@ EXPORT_SYMBOL(kmap); void kunmap(struct page *page) { - if (in_interrupt()) - BUG(); + might_sleep(); if (!PageHighMem(page)) return; kunmap_high(page); diff --git a/arch/xtensa/include/asm/highmem.h b/arch/xtensa/include/asm/highmem.h index 04e9340eac4b..413848cc1e56 100644 --- a/arch/xtensa/include/asm/highmem.h +++ b/arch/xtensa/include/asm/highmem.h @@ -73,7 +73,7 @@ static inline void *kmap(struct page *page) */ BUILD_BUG_ON(PKMAP_BASE < TLBTEMP_BASE_1 + TLBTEMP_SIZE); - BUG_ON(in_interrupt()); + might_sleep(); if (!PageHighMem(page)) return page_address(page); return kmap_high(page); @@ -81,7 +81,7 @@ static inline void *kmap(struct page *page) static inline void kunmap(struct page *page) { - BUG_ON(in_interrupt()); + might_sleep(); if (!PageHighMem(page)) return; kunmap_high(page); -- cgit v1.2.3