Messages in this thread | | | From | Michael Ellerman <> | Subject | Re: [PATCH v2] powerpc/uaccess: Use flexible addressing with __put_user()/__get_user() | Date | Tue, 30 Jun 2020 11:19:29 +1000 |
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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
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