diff options
| author |   Paul Mundt <lethal@linux-sh.org> | 2007-10-15 11:01:33 +0900 |
|---|---|---|
| committer | Paul Mundt <lethal@linux-sh.org> | 2007-10-30 08:44:13 +0900 |
| commit | afca03574555c9af9a86d5a025f0187d0b77ac32 (patch) | |
| tree | 1aecc7abac9c1e3942659e77c63d0d79cb3bd7ce | |
| parent | sh: Clean up Kconfig entry for Dreamcast. (diff) | |
| download | linux-dev-afca03574555c9af9a86d5a025f0187d0b77ac32.tar.xz linux-dev-afca03574555c9af9a86d5a025f0187d0b77ac32.zip | |
sh: Correct pte_page() breakage.
As noted by David:
pte_page() is a macro defined as follows;
include/asm-sh/pgtable.h
#define pte_page(x) phys_to_page(pte_val(x)&PTE_PHYS_MASK)
include/asm-sh/page.h
#define phys_to_page(phys) (pfn_to_page(phys >> PAGE_SHIFT))
So as you can see the phys_to_page() macro doesn't wrap the 'phys'
parameter in parentheses so we end up with;
pte_val(x)&PTE_PHYS_MASK >> PAGE_SHIFT
Which is not what we wanted as '>>' has a higher precedence than bitwise
AND. I dug into the git repository and I believe this bug was added with
this commit (104b8deaa5c0144cccfc7d914413ff80c7176af1);
2006-03-27 KAMEZAWA Hiroyuki [PATCH] unify pfn_to_page: sh pfn_to_page
-#define phys_to_page(phys) (mem_map + (((phys)-__MEMORY_START) >>
PAGE_SHIFT))
-#define page_to_phys(page) (((page - mem_map) << PAGE_SHIFT) +
__MEMORY_START)
+#define phys_to_page(phys) (pfn_to_page(phys >> PAGE_SHIFT))
+#define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT)
Reported-by: David ADDISON <david.addison@st.com>
Reported-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
| -rw-r--r-- | include/asm-sh/page.h | 1 | ||||
| -rw-r--r-- | include/asm-sh/pgtable.h | 2 |
2 files changed, 1 insertions, 2 deletions
diff --git a/include/asm-sh/page.h b/include/asm-sh/page.h index cb3d46c59eab..3aa8b07da47d 100644 --- a/include/asm-sh/page.h +++ b/include/asm-sh/page.h @@ -128,7 +128,6 @@ typedef struct { unsigned long pgd; } pgd_t; #define __va(x) ((void *)((unsigned long)(x)+PAGE_OFFSET)) #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT) -#define phys_to_page(phys) (pfn_to_page(phys >> PAGE_SHIFT)) #define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT) /* PFN start number, because of __MEMORY_START */ diff --git a/include/asm-sh/pgtable.h b/include/asm-sh/pgtable.h index cf0dd2b648c2..0b1d7c665659 100644 --- a/include/asm-sh/pgtable.h +++ b/include/asm-sh/pgtable.h @@ -399,7 +399,7 @@ static inline void set_pte(pte_t *ptep, pte_t pte) #define pmd_bad(x) (pmd_val(x) & ~PAGE_MASK) #define pages_to_mb(x) ((x) >> (20-PAGE_SHIFT)) -#define pte_page(x) phys_to_page(pte_val(x)&PTE_PHYS_MASK) +#define pte_page(x) pfn_to_page(pte_pfn(x)) /* * The following only work if pte_present() is true. |