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highmem: Make __kunmap_{local,atomic}() take const void pointer

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__kunmap_ {local,atomic}() currently take pointers to void. However, this
is semantically incorrect, since these functions do not change the memory
their arguments point to.

Therefore, make this semantics explicit by modifying the
__kunmap_{local,atomic}() prototypes to take pointers to const void.

As a side effect, compilers may produce more efficient code.

Acked-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Helge Deller <deller@gmx.de>  # parisc
Suggested-by: David Sterba <dsterba@suse.cz>
Suggested-by: Ira Weiny <ira.weiny@intel.com>
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Signed-off-by: Fabio M. De Francesco <fmdefrancesco@gmail.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Fabio M. De Francesco
2022-07-06 13:15:19 +02:00
committed by David Sterba
parent ac5e666951
commit 39ade048a3
4 changed files with 10 additions and 10 deletions
Download Patch File Download Diff File Expand all files Collapse all files

10
include/linux/highmem-internal.h
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@@ -8,7 +8,7 @@
#ifdef CONFIG_KMAP_LOCAL
void *__kmap_local_pfn_prot(unsigned long pfn, pgprot_t prot);
void *__kmap_local_page_prot(struct page *page, pgprot_t prot);
void kunmap_local_indexed(void *vaddr);
void kunmap_local_indexed(const void *vaddr);
void kmap_local_fork(struct task_struct *tsk);
void __kmap_local_sched_out(void);
void __kmap_local_sched_in(void);
@@ -89,7 +89,7 @@ static inline void *kmap_local_pfn(unsigned long pfn)
return __kmap_local_pfn_prot(pfn, kmap_prot);
}
static inline void __kunmap_local(void *vaddr)
static inline void __kunmap_local(const void *vaddr)
{
kunmap_local_indexed(vaddr);
}
@@ -121,7 +121,7 @@ static inline void *kmap_atomic_pfn(unsigned long pfn)
return __kmap_local_pfn_prot(pfn, kmap_prot);
}
static inline void __kunmap_atomic(void *addr)
static inline void __kunmap_atomic(const void *addr)
{
kunmap_local_indexed(addr);
pagefault_enable();
@@ -197,7 +197,7 @@ static inline void *kmap_local_pfn(unsigned long pfn)
return kmap_local_page(pfn_to_page(pfn));
}
static inline void __kunmap_local(void *addr)
static inline void __kunmap_local(const void *addr)
{
#ifdef ARCH_HAS_FLUSH_ON_KUNMAP
kunmap_flush_on_unmap(addr);
@@ -224,7 +224,7 @@ static inline void *kmap_atomic_pfn(unsigned long pfn)
return kmap_atomic(pfn_to_page(pfn));
}
static inline void __kunmap_atomic(void *addr)
static inline void __kunmap_atomic(const void *addr)
{
#ifdef ARCH_HAS_FLUSH_ON_KUNMAP
kunmap_flush_on_unmap(addr);