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mn10300: fix kernel build failures when using gcc-4.x
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>
This commit is contained in:
Mark Salter
Linus Torvalds
parent
933d35f00c
commit
d22a001bf6
3 changed files with 45 additions and 40 deletions
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@ -129,42 +129,47 @@ extern int fixup_exception(struct pt_regs *regs);
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struct __large_struct { unsigned long buf[100]; };
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#define __m(x) (*(struct __large_struct *)(x))
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#define __get_user_nocheck(x, ptr, size) \
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({ \
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__typeof(*(ptr)) __gu_val; \
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unsigned long __gu_addr; \
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int __gu_err; \
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__gu_addr = (unsigned long) (ptr); \
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switch (size) { \
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case 1: __get_user_asm("bu"); break; \
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case 2: __get_user_asm("hu"); break; \
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case 4: __get_user_asm("" ); break; \
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default: __get_user_unknown(); break; \
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} \
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x = (__typeof__(*(ptr))) __gu_val; \
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__gu_err; \
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#define __get_user_nocheck(x, ptr, size) \
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({ \
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unsigned long __gu_addr; \
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int __gu_err; \
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__gu_addr = (unsigned long) (ptr); \
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switch (size) { \
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case 1: { \
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unsigned char __gu_val; \
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__get_user_asm("bu"); \
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(x) = *(__force __typeof__(*(ptr))*) &__gu_val; \
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break; \
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} \
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case 2: { \
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unsigned short __gu_val; \
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__get_user_asm("hu"); \
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(x) = *(__force __typeof__(*(ptr))*) &__gu_val; \
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break; \
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} \
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case 4: { \
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unsigned int __gu_val; \
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__get_user_asm(""); \
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(x) = *(__force __typeof__(*(ptr))*) &__gu_val; \
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break; \
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} \
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default: \
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__get_user_unknown(); \
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break; \
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} \
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__gu_err; \
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})
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#define __get_user_check(x, ptr, size) \
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({ \
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__typeof__(*(ptr)) __gu_val; \
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unsigned long __gu_addr; \
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int __gu_err; \
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__gu_addr = (unsigned long) (ptr); \
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if (likely(__access_ok(__gu_addr,size))) { \
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switch (size) { \
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case 1: __get_user_asm("bu"); break; \
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case 2: __get_user_asm("hu"); break; \
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case 4: __get_user_asm("" ); break; \
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default: __get_user_unknown(); break; \
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} \
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} \
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else { \
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__gu_err = -EFAULT; \
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__gu_val = 0; \
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} \
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x = (__typeof__(*(ptr))) __gu_val; \
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__gu_err; \
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#define __get_user_check(x, ptr, size) \
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({ \
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int _e; \
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if (likely(__access_ok((unsigned long) (ptr), (size)))) \
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_e = __get_user_nocheck((x), (ptr), (size)); \
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else { \
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_e = -EFAULT; \
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(x) = (__typeof__(x))0; \
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} \
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_e; \
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})
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#define __get_user_asm(INSN) \
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@ -20,9 +20,9 @@ extern unsigned long mn10300_ioclk; /* IOCLK (crystal speed) in HZ */
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extern unsigned long mn10300_iobclk;
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extern unsigned long mn10300_tsc_per_HZ;
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#define MN10300_IOCLK ((unsigned long)mn10300_ioclk)
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#define MN10300_IOCLK mn10300_ioclk
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/* If this processors has a another clock, uncomment the below. */
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/* #define MN10300_IOBCLK ((unsigned long)mn10300_iobclk) */
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/* #define MN10300_IOBCLK mn10300_iobclk */
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#else /* !CONFIG_MN10300_RTC */
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@ -35,7 +35,7 @@ extern unsigned long mn10300_tsc_per_HZ;
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#define MN10300_TSCCLK MN10300_IOCLK
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#ifdef CONFIG_MN10300_RTC
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#define MN10300_TSC_PER_HZ ((unsigned long)mn10300_tsc_per_HZ)
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#define MN10300_TSC_PER_HZ mn10300_tsc_per_HZ
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#else /* !CONFIG_MN10300_RTC */
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#define MN10300_TSC_PER_HZ (MN10300_TSCCLK/HZ)
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#endif /* !CONFIG_MN10300_RTC */
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@ -20,9 +20,9 @@ extern unsigned long mn10300_ioclk; /* IOCLK (crystal speed) in HZ */
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extern unsigned long mn10300_iobclk;
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extern unsigned long mn10300_tsc_per_HZ;
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#define MN10300_IOCLK ((unsigned long)mn10300_ioclk)
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#define MN10300_IOCLK mn10300_ioclk
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/* If this processors has a another clock, uncomment the below. */
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/* #define MN10300_IOBCLK ((unsigned long)mn10300_iobclk) */
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/* #define MN10300_IOBCLK mn10300_iobclk */
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#else /* !CONFIG_MN10300_RTC */
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@ -35,7 +35,7 @@ extern unsigned long mn10300_tsc_per_HZ;
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#define MN10300_TSCCLK MN10300_IOCLK
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#ifdef CONFIG_MN10300_RTC
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#define MN10300_TSC_PER_HZ ((unsigned long)mn10300_tsc_per_HZ)
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#define MN10300_TSC_PER_HZ mn10300_tsc_per_HZ
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#else /* !CONFIG_MN10300_RTC */
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#define MN10300_TSC_PER_HZ (MN10300_TSCCLK/HZ)
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#endif /* !CONFIG_MN10300_RTC */
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