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| author | Chris Metcalf <cmetcalf@ezchip.com> | 2015-01-13 22:39:05 +0300 |
|---|---|---|
| committer | Chris Metcalf <cmetcalf@ezchip.com> | 2015-01-14 02:44:17 +0300 |
| commit | f3c927125fa49a42d596434d1ed454195c0d4530 (patch) | |
| tree | 80fc76e45b361fe5021861bc8e2d57a46048c0c0 /arch/tile/include/asm/uaccess.h | |
| parent | e9118a4914e47e915952842828401779f09cecb8 (diff) | |
| download | linux-f3c927125fa49a42d596434d1ed454195c0d4530.tar.xz | |
tile: fix put_user sparse errors
Use x86's __inttype macro instead of using the typeof(x-x) trick to
generate a suitable integer size type. This avoids a sparse warning
when examining the x-x type with a bitwise type.
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Chris Metcalf <cmetcalf@ezchip.com>
Diffstat (limited to 'arch/tile/include/asm/uaccess.h')
| -rw-r--r-- | arch/tile/include/asm/uaccess.h | 18 |
1 files changed, 9 insertions, 9 deletions
diff --git a/arch/tile/include/asm/uaccess.h b/arch/tile/include/asm/uaccess.h index b6cde3209b96..b81b24a8489b 100644 --- a/arch/tile/include/asm/uaccess.h +++ b/arch/tile/include/asm/uaccess.h @@ -114,14 +114,14 @@ struct exception_table_entry { extern int fixup_exception(struct pt_regs *regs); /* + * This is a type: either unsigned long, if the argument fits into + * that type, or otherwise unsigned long long. + */ +#define __inttype(x) \ + __typeof__(__builtin_choose_expr(sizeof(x) > sizeof(0UL), 0ULL, 0UL)) + +/* * Support macros for __get_user(). - * - * Implementation note: The "case 8" logic of casting to the type of - * the result of subtracting the value from itself is basically a way - * of keeping all integer types the same, but casting any pointers to - * ptrdiff_t, i.e. also an integer type. This way there are no - * questionable casts seen by the compiler on an ILP32 platform. - * * Note that __get_user() and __put_user() assume proper alignment. */ @@ -178,7 +178,7 @@ extern int fixup_exception(struct pt_regs *regs); "9:" \ : "=r" (ret), "=r" (__a), "=&r" (__b) \ : "r" (ptr), "i" (-EFAULT)); \ - (x) = (__typeof(x))(__typeof((x)-(x))) \ + (x) = (__force __typeof(x))(__inttype(x)) \ (((u64)__hi32(__a, __b) << 32) | \ __lo32(__a, __b)); \ }) @@ -246,7 +246,7 @@ extern int __get_user_bad(void) #define __put_user_4(x, ptr, ret) __put_user_asm(sw, x, ptr, ret) #define __put_user_8(x, ptr, ret) \ ({ \ - u64 __x = (__typeof((x)-(x)))(x); \ + u64 __x = (__force __inttype(x))(x); \ int __lo = (int) __x, __hi = (int) (__x >> 32); \ asm volatile("1: { sw %1, %2; addi %0, %1, 4 }\n" \ "2: { sw %0, %3; movei %0, 0 }\n" \ |