lkml.org 
[lkml]   [2020]   [Jun]   [29]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRe: [PATCH v2] powerpc/uaccess: Use flexible addressing with __put_user()/__get_user()
Date
Michael Ellerman <mpe@ellerman.id.au> writes:
> Christophe Leroy <christophe.leroy@csgroup.eu> writes:
>> Hi Michael,
>>
>> I see this patch is marked as "defered" in patchwork, but I can't see
>> any related discussion. Is it normal ?
>
> Because it uses the "m<>" constraint which didn't work on GCC 4.6.
>
> https://github.com/linuxppc/issues/issues/297
>
> So we should be able to pick it up for v5.9 hopefully.

It seems to break the build with the kernel.org 4.9.4 compiler and
corenet64_smp_defconfig:

+ make -s CC=powerpc64-linux-gnu-gcc -j 160
In file included from /linux/include/linux/uaccess.h:11:0,
from /linux/include/linux/sched/task.h:11,
from /linux/include/linux/sched/signal.h:9,
from /linux/include/linux/rcuwait.h:6,
from /linux/include/linux/percpu-rwsem.h:7,
from /linux/include/linux/fs.h:33,
from /linux/include/linux/huge_mm.h:8,
from /linux/include/linux/mm.h:675,
from /linux/arch/powerpc/kernel/signal_32.c:17:
/linux/arch/powerpc/kernel/signal_32.c: In function 'save_user_regs.isra.14.constprop':
/linux/arch/powerpc/include/asm/uaccess.h:161:2: error: 'asm' operand has impossible constraints
__asm__ __volatile__( \
^
/linux/arch/powerpc/include/asm/uaccess.h:197:12: note: in expansion of macro '__put_user_asm'
case 4: __put_user_asm(x, ptr, retval, "stw"); break; \
^
/linux/arch/powerpc/include/asm/uaccess.h:206:2: note: in expansion of macro '__put_user_size_allowed'
__put_user_size_allowed(x, ptr, size, retval); \
^
/linux/arch/powerpc/include/asm/uaccess.h:220:2: note: in expansion of macro '__put_user_size'
__put_user_size(__pu_val, __pu_addr, __pu_size, __pu_err); \
^
/linux/arch/powerpc/include/asm/uaccess.h:96:2: note: in expansion of macro '__put_user_nocheck'
__put_user_nocheck((__typeof__(*(ptr)))(x), (ptr), sizeof(*(ptr)))
^
/linux/arch/powerpc/kernel/signal_32.c:120:7: note: in expansion of macro '__put_user'
if (__put_user((unsigned int)gregs[i], &frame->mc_gregs[i]))
^
/linux/scripts/Makefile.build:280: recipe for target 'arch/powerpc/kernel/signal_32.o' failed
make[3]: *** [arch/powerpc/kernel/signal_32.o] Error 1
make[3]: *** Waiting for unfinished jobs....
In file included from /linux/include/linux/uaccess.h:11:0,
from /linux/include/linux/sched/task.h:11,
from /linux/include/linux/sched/signal.h:9,
from /linux/include/linux/rcuwait.h:6,
from /linux/include/linux/percpu-rwsem.h:7,
from /linux/include/linux/fs.h:33,
from /linux/include/linux/huge_mm.h:8,
from /linux/include/linux/mm.h:675,
from /linux/arch/powerpc/kernel/signal_64.c:12:
/linux/arch/powerpc/kernel/signal_64.c: In function '__se_sys_swapcontext':
/linux/arch/powerpc/include/asm/uaccess.h:319:2: error: 'asm' operand has impossible constraints
__asm__ __volatile__( \
^
/linux/arch/powerpc/include/asm/uaccess.h:359:10: note: in expansion of macro '__get_user_asm'
case 1: __get_user_asm(x, (u8 __user *)ptr, retval, "lbz"); break; \
^
/linux/arch/powerpc/include/asm/uaccess.h:370:2: note: in expansion of macro '__get_user_size_allowed'
__get_user_size_allowed(x, ptr, size, retval); \
^
/linux/arch/powerpc/include/asm/uaccess.h:393:3: note: in expansion of macro '__get_user_size'
__get_user_size(__gu_val, __gu_addr, __gu_size, __gu_err); \
^
/linux/arch/powerpc/include/asm/uaccess.h:94:2: note: in expansion of macro '__get_user_nocheck'
__get_user_nocheck((x), (ptr), sizeof(*(ptr)), true)
^
/linux/arch/powerpc/kernel/signal_64.c:672:9: note: in expansion of macro '__get_user'
|| __get_user(tmp, (u8 __user *) new_ctx + ctx_size - 1))
^
/linux/scripts/Makefile.build:280: recipe for target 'arch/powerpc/kernel/signal_64.o' failed
make[3]: *** [arch/powerpc/kernel/signal_64.o] Error 1
/linux/scripts/Makefile.build:497: recipe for target 'arch/powerpc/kernel' failed
make[2]: *** [arch/powerpc/kernel] Error 2
/linux/Makefile:1756: recipe for target 'arch/powerpc' failed
make[1]: *** [arch/powerpc] Error 2
Makefile:185: recipe for target '__sub-make' failed
make: *** [__sub-make] Error 2


cheers

\
 
 \ /
  Last update: 2020-06-30 03:19    [W:0.076 / U:7.480 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site