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| author | Ingo Molnar <mingo@kernel.org> | 2012-11-23 19:19:07 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2015-04-20 08:41:37 +0200 |
| commit | 94d4b4765b7ddb8478b0d57663cf7a08e2263bbf (patch) | |
| tree | 24623ba9c1edeb13d491b036ec8c2c5f7557f953 /arch/x86 | |
| parent | config: Enable NEED_DMA_MAP_STATE by default when SWIOTLB is selected (diff) | |
| download | linux-94d4b4765b7ddb8478b0d57663cf7a08e2263bbf.tar.xz linux-94d4b4765b7ddb8478b0d57663cf7a08e2263bbf.zip | |
x86/mm: Clean up types in xlate_dev_mem_ptr()
Pavel Machek reported the following compiler warning on
x86/32 CONFIG_HIGHMEM64G=y builds:
arch/x86/mm/ioremap.c:344:10: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
Clean up the types in this function by using a single natural type for
internal calculations (unsigned long), to make it more apparent what's
happening, and also to remove fragile casts.
Reported-by: Pavel Machek <pavel@ucw.cz>
Cc: jgross@suse.com
Cc: roland@purestorage.com
Link: http://lkml.kernel.org/r/20150416080440.GA507@amd
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/mm/ioremap.c | 14 |
1 files changed, 8 insertions, 6 deletions
diff --git a/arch/x86/mm/ioremap.c b/arch/x86/mm/ioremap.c index fdf617c00e2f..4bf037b20f47 100644 --- a/arch/x86/mm/ioremap.c +++ b/arch/x86/mm/ioremap.c @@ -332,18 +332,20 @@ EXPORT_SYMBOL(iounmap); */ void *xlate_dev_mem_ptr(phys_addr_t phys) { - void *addr; - unsigned long start = phys & PAGE_MASK; + unsigned long start = phys & PAGE_MASK; + unsigned long offset = phys & ~PAGE_MASK; + unsigned long vaddr; /* If page is RAM, we can use __va. Otherwise ioremap and unmap. */ if (page_is_ram(start >> PAGE_SHIFT)) return __va(phys); - addr = (void __force *)ioremap_cache(start, PAGE_SIZE); - if (addr) - addr = (void *)((unsigned long)addr | (phys & ~PAGE_MASK)); + vaddr = (unsigned long)ioremap_cache(start, PAGE_SIZE); + /* Only add the offset on success and return NULL if the ioremap() failed: */ + if (vaddr) + vaddr += offset; - return addr; + return (void *)vaddr; } void unxlate_dev_mem_ptr(phys_addr_t phys, void *addr) |