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authorIra Weiny <ira.weiny@intel.com>2020-06-05 02:47:46 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2020-06-05 05:06:22 +0300
commitabca2500c0c1b20c3e552f259da4c4a99db3b4d1 (patch)
tree3913a59673f03cdf62b74570102dfb99b7b9f834 /include/linux/highmem.h
parent78b6d91ec7bbfc5bcc2dd05bb2cf13c9de1dc7cd (diff)
downloadlinux-abca2500c0c1b20c3e552f259da4c4a99db3b4d1.tar.xz
arch/kunmap_atomic: consolidate duplicate code
Every single architecture (including !CONFIG_HIGHMEM) calls... pagefault_enable(); preempt_enable(); ... before returning from __kunmap_atomic(). Lift this code into the kunmap_atomic() macro. While we are at it rename __kunmap_atomic() to kunmap_atomic_high() to be consistent. [ira.weiny@intel.com: don't enable pagefault/preempt twice] Link: http://lkml.kernel.org/r/20200518184843.3029640-1-ira.weiny@intel.com [akpm@linux-foundation.org: coding style fixes] Signed-off-by: Ira Weiny <ira.weiny@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Reviewed-by: Christoph Hellwig <hch@lst.de> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Andy Lutomirski <luto@kernel.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Christian König <christian.koenig@amd.com> Cc: Chris Zankel <chris@zankel.net> Cc: Daniel Vetter <daniel.vetter@ffwll.ch> Cc: Dan Williams <dan.j.williams@intel.com> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: "David S. Miller" <davem@davemloft.net> Cc: Helge Deller <deller@gmx.de> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com> Cc: Max Filippov <jcmvbkbc@gmail.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Guenter Roeck <linux@roeck-us.net> Link: http://lkml.kernel.org/r/20200507150004.1423069-8-ira.weiny@intel.com Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/highmem.h')
-rw-r--r--include/linux/highmem.h13
1 files changed, 9 insertions, 4 deletions
diff --git a/include/linux/highmem.h b/include/linux/highmem.h
index d2209ae8be99..945b58d8a57b 100644
--- a/include/linux/highmem.h
+++ b/include/linux/highmem.h
@@ -33,6 +33,7 @@ static inline void invalidate_kernel_vmap_range(void *vaddr, int size)
#ifdef CONFIG_HIGHMEM
extern void *kmap_atomic_high(struct page *page);
+extern void kunmap_atomic_high(void *kvaddr);
#include <asm/highmem.h>
#ifndef ARCH_HAS_KMAP_FLUSH_TLB
@@ -151,10 +152,12 @@ static inline void *kmap_atomic(struct page *page)
}
#define kmap_atomic_prot(page, prot) kmap_atomic(page)
-static inline void __kunmap_atomic(void *addr)
+static inline void kunmap_atomic_high(void *addr)
{
- pagefault_enable();
- preempt_enable();
+ /*
+ * Nothing to do in the CONFIG_HIGHMEM=n case as kunmap_atomic()
+ * handles re-enabling faults + preemption
+ */
}
#define kmap_atomic_pfn(pfn) kmap_atomic(pfn_to_page(pfn))
@@ -204,7 +207,9 @@ static inline void kmap_atomic_idx_pop(void)
#define kunmap_atomic(addr) \
do { \
BUILD_BUG_ON(__same_type((addr), struct page *)); \
- __kunmap_atomic(addr); \
+ kunmap_atomic_high(addr); \
+ pagefault_enable(); \
+ preempt_enable(); \
} while (0)