On 10/25/2015 10:47 PM, Florian Fainelli wrote: > Le 25/10/2015 14:10, Hauke Mehrtens a écrit : >> This patch is causing a build error for me on 4.3-rc7. >> >> CC arch/mips/kernel/signal.o >> arch/mips/kernel/signal.c: In function 'sc_to_extcontext': >> arch/mips/kernel/signal.c:143:12: error: 'struct ucontext' has no member >> named 'uc_extcontext' >> return &uc->uc_extcontext; >> ^ >> In file included from include/linux/poll.h:11:0, >> from include/linux/ring_buffer.h:7, >> from include/linux/trace_events.h:5, >> from include/trace/syscall.h:6, >> from include/linux/syscalls.h:81, >> from arch/mips/kernel/signal.c:26: >> arch/mips/kernel/signal.c: In function 'save_msa_extcontext': >> arch/mips/kernel/signal.c:171:40: error: dereferencing pointer to >> incomplete type 'struct msa_extcontext' >> err = __put_user(read_msa_csr(), &msa->csr); >> ^ >> ./arch/mips/include/asm/uaccess.h:441:15: note: in definition of macro >> '__put_user_nocheck' >> __typeof__(*(ptr)) __pu_val; \ >> ^ >> arch/mips/kernel/signal.c:171:9: note: in expansion of macro '__put_user' >> err = __put_user(read_msa_csr(), &msa->csr); >> ^ >> arch/mips/kernel/signal.c:186:20: error: 'MSA_EXTCONTEXT_MAGIC' >> undeclared (first use in this function) >> err |= __put_user(MSA_EXTCONTEXT_MAGIC, &msa->ext.magic); >> ^ >> ./arch/mips/include/asm/uaccess.h:444:14: note: in definition of macro >> '__put_user_nocheck' >> __pu_val = (x); \ >> ^ >> arch/mips/kernel/signal.c:186:9: note: in expansion of macro '__put_user' >> err |= __put_user(MSA_EXTCONTEXT_MAGIC, &msa->ext.magic); >> ^ >> arch/mips/kernel/signal.c:186:20: note: each undeclared identifier is >> reported only once for each function it appears in >> err |= __put_user(MSA_EXTCONTEXT_MAGIC, &msa->ext.magic); >> ^ >> ./arch/mips/include/asm/uaccess.h:444:14: note: in definition of macro >> '__put_user_nocheck' >> __pu_val = (x); \ >> ^ >> arch/mips/kernel/signal.c:186:9: note: in expansion of macro '__put_user' >> err |= __put_user(MSA_EXTCONTEXT_MAGIC, &msa->ext.magic); >> ^ >> ....... >> >> >> When I include uapi/asm/ucontext.h instead of asm/ucontext.h in signal.c >> it compiles again. > > The problem appears if you had previously auto-generated files in > arch/mips/include/generated that do not get automatically cleaned up > when you switch to a new kernel version, and with an incompatible > ucontext layout between the two. > > Jacek tripped over that here: > > https://www.linux-mips.org/archives/linux-mips/2015-09/msg00150.html > > and I asked whether we could follow-up with a proper Kbuild patch to > address that build dependency here: > > https://www.linux-mips.org/archives/linux-mips/2015-09/msg00165.html > > but this does not appear to have been proposed or addressed yet. > > Paul, could you look into this and see how we could teach Kbuild about > this build dependency? > Yes that was the problem, after doing this I worked again: rm arch/mips/include/generated/ -rf Hauke
