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mn10300: fix kernel build failures when using gcc-4.x
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Fix some build failures when using gcc-4.x for MN10300.

Firstly, __get_user() fails to build because the pointer points to a const and
__gu_val ends up being read-only:

In file included from include/linux/mempolicy.h:62,
                 from init/main.c:50:
include/linux/pagemap.h: In function 'fault_in_pages_readable':
include/linux/pagemap.h:394: error: read-only variable '__gu_val' used as 'asm' output
include/linux/pagemap.h:394: error: read-only variable '__gu_val' used as 'asm' output
include/linux/pagemap.h:394: error: read-only variable '__gu_val' used as 'asm' output
include/linux/pagemap.h:400: error: read-only variable '__gu_val' used as 'asm' output
include/linux/pagemap.h:400: error: read-only variable '__gu_val' used as 'asm' output
include/linux/pagemap.h:400: error: read-only variable '__gu_val' used as 'asm' output
make[1]: *** [init/main.o] Error 1

Secondly, gcc-4 doesn't allow casts of lvalues:

  UPD     include/linux/compile.h
arch/mn10300/kernel/rtc.c: In function 'calibrate_clock':
arch/mn10300/kernel/rtc.c:170: error: lvalue required as left operand of assignment
arch/mn10300/kernel/rtc.c:172: error: lvalue required as left operand of assignment
make[1]: *** [arch/mn10300/kernel/rtc.o] Error 1

These are seen with gcc 4.2.1.

Signed-off-by: Mark Salter <msalter@redhat.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Mark Salter authored and Linus Torvalds committed Oct 1, 2009
1 parent 933d35f commit d22a001
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Showing 3 changed files with 45 additions and 40 deletions.
73 changes: 39 additions & 34 deletions arch/mn10300/include/asm/uaccess.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -129,42 +129,47 @@ extern int fixup_exception(struct pt_regs *regs);
struct __large_struct { unsigned long buf[100]; };
#define __m(x) (*(struct __large_struct *)(x))

#define __get_user_nocheck(x, ptr, size) \
({ \
__typeof(*(ptr)) __gu_val; \
unsigned long __gu_addr; \
int __gu_err; \
__gu_addr = (unsigned long) (ptr); \
switch (size) { \
case 1: __get_user_asm("bu"); break; \
case 2: __get_user_asm("hu"); break; \
case 4: __get_user_asm("" ); break; \
default: __get_user_unknown(); break; \
} \
x = (__typeof__(*(ptr))) __gu_val; \
__gu_err; \
#define __get_user_nocheck(x, ptr, size) \
({ \
unsigned long __gu_addr; \
int __gu_err; \
__gu_addr = (unsigned long) (ptr); \
switch (size) { \
case 1: { \
unsigned char __gu_val; \
__get_user_asm("bu"); \
(x) = *(__force __typeof__(*(ptr))*) &__gu_val; \
break; \
} \
case 2: { \
unsigned short __gu_val; \
__get_user_asm("hu"); \
(x) = *(__force __typeof__(*(ptr))*) &__gu_val; \
break; \
} \
case 4: { \
unsigned int __gu_val; \
__get_user_asm(""); \
(x) = *(__force __typeof__(*(ptr))*) &__gu_val; \
break; \
} \
default: \
__get_user_unknown(); \
break; \
} \
__gu_err; \
})

#define __get_user_check(x, ptr, size) \
({ \
__typeof__(*(ptr)) __gu_val; \
unsigned long __gu_addr; \
int __gu_err; \
__gu_addr = (unsigned long) (ptr); \
if (likely(__access_ok(__gu_addr,size))) { \
switch (size) { \
case 1: __get_user_asm("bu"); break; \
case 2: __get_user_asm("hu"); break; \
case 4: __get_user_asm("" ); break; \
default: __get_user_unknown(); break; \
} \
} \
else { \
__gu_err = -EFAULT; \
__gu_val = 0; \
} \
x = (__typeof__(*(ptr))) __gu_val; \
__gu_err; \
#define __get_user_check(x, ptr, size) \
({ \
int _e; \
if (likely(__access_ok((unsigned long) (ptr), (size)))) \
_e = __get_user_nocheck((x), (ptr), (size)); \
else { \
_e = -EFAULT; \
(x) = (__typeof__(x))0; \
} \
_e; \
})

#define __get_user_asm(INSN) \
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6 changes: 3 additions & 3 deletions arch/mn10300/unit-asb2303/include/unit/clock.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -20,9 +20,9 @@ extern unsigned long mn10300_ioclk; /* IOCLK (crystal speed) in HZ */
extern unsigned long mn10300_iobclk;
extern unsigned long mn10300_tsc_per_HZ;

#define MN10300_IOCLK ((unsigned long)mn10300_ioclk)
#define MN10300_IOCLK mn10300_ioclk
/* If this processors has a another clock, uncomment the below. */
/* #define MN10300_IOBCLK ((unsigned long)mn10300_iobclk) */
/* #define MN10300_IOBCLK mn10300_iobclk */

#else /* !CONFIG_MN10300_RTC */

Expand All @@ -35,7 +35,7 @@ extern unsigned long mn10300_tsc_per_HZ;
#define MN10300_TSCCLK MN10300_IOCLK

#ifdef CONFIG_MN10300_RTC
#define MN10300_TSC_PER_HZ ((unsigned long)mn10300_tsc_per_HZ)
#define MN10300_TSC_PER_HZ mn10300_tsc_per_HZ
#else /* !CONFIG_MN10300_RTC */
#define MN10300_TSC_PER_HZ (MN10300_TSCCLK/HZ)
#endif /* !CONFIG_MN10300_RTC */
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6 changes: 3 additions & 3 deletions arch/mn10300/unit-asb2305/include/unit/clock.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -20,9 +20,9 @@ extern unsigned long mn10300_ioclk; /* IOCLK (crystal speed) in HZ */
extern unsigned long mn10300_iobclk;
extern unsigned long mn10300_tsc_per_HZ;

#define MN10300_IOCLK ((unsigned long)mn10300_ioclk)
#define MN10300_IOCLK mn10300_ioclk
/* If this processors has a another clock, uncomment the below. */
/* #define MN10300_IOBCLK ((unsigned long)mn10300_iobclk) */
/* #define MN10300_IOBCLK mn10300_iobclk */

#else /* !CONFIG_MN10300_RTC */

Expand All @@ -35,7 +35,7 @@ extern unsigned long mn10300_tsc_per_HZ;
#define MN10300_TSCCLK MN10300_IOCLK

#ifdef CONFIG_MN10300_RTC
#define MN10300_TSC_PER_HZ ((unsigned long)mn10300_tsc_per_HZ)
#define MN10300_TSC_PER_HZ mn10300_tsc_per_HZ
#else /* !CONFIG_MN10300_RTC */
#define MN10300_TSC_PER_HZ (MN10300_TSCCLK/HZ)
#endif /* !CONFIG_MN10300_RTC */
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