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SubjectRe: [PATCH] x86/fpu: move FPU state into separate cache
Hi Kees,

[auto build test ERROR on kvm/linux-next]
[also build test ERROR on v4.11-rc4 next-20170330]
[cannot apply to tip/x86/core]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url: https://github.com/0day-ci/linux/commits/Kees-Cook/x86-fpu-move-FPU-state-into-separate-cache/20170331-110507
base: https://git.kernel.org/pub/scm/virt/kvm/kvm.git linux-next
config: i386-randconfig-s0-201713 (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
# save the attached .config to linux build tree
make ARCH=i386

All error/warnings (new ones prefixed by >>):

In file included from arch/x86/include/asm/cpufeature.h:4:0,
from arch/x86/include/asm/thread_info.h:52,
from include/linux/thread_info.h:25,
from arch/x86/include/asm/preempt.h:6,
from include/linux/preempt.h:80,
from include/linux/spinlock.h:50,
from include/linux/rcupdate.h:38,
from include/linux/init_task.h:4,
from init/init_task.c:1:
>> arch/x86/include/asm/processor.h:805:17: error: 'init_fpregs_state' undeclared here (not in a function)
.fpu.state = &init_fpregs_state, \
^
>> include/linux/init_task.h:255:13: note: in expansion of macro 'INIT_THREAD'
.thread = INIT_THREAD, \
^~~~~~~~~~~
>> init/init_task.c:19:32: note: in expansion of macro 'INIT_TASK'
struct task_struct init_task = INIT_TASK(init_task);
^~~~~~~~~
--
In file included from arch/x86/math-emu/fpu_entry.c:35:0:
arch/x86/math-emu/status_w.h: In function 'setcc':
>> arch/x86/math-emu/fpu_system.h:71:30: error: 'get_current()->thread.fpu.state' is a pointer; did you mean to use '->'?
#define partial_status (I387->soft.swd)
^
->
>> arch/x86/math-emu/status_w.h:53:2: note: in expansion of macro 'partial_status'
partial_status &= ~(SW_C0 | SW_C1 | SW_C2 | SW_C3);
^~~~~~~~~~~~~~
>> arch/x86/math-emu/fpu_system.h:71:30: error: 'get_current()->thread.fpu.state' is a pointer; did you mean to use '->'?
#define partial_status (I387->soft.swd)
^
->
arch/x86/math-emu/status_w.h:54:2: note: in expansion of macro 'partial_status'
partial_status |= (cc) & (SW_C0 | SW_C1 | SW_C2 | SW_C3);
^~~~~~~~~~~~~~
arch/x86/math-emu/fpu_entry.c: In function 'math_emulate':
arch/x86/math-emu/fpu_system.h:50:24: error: 'get_current()->thread.fpu.state' is a pointer; did you mean to use '->'?
#define FPU_info (I387->soft.info)
^
->
>> arch/x86/math-emu/fpu_entry.c:126:2: note: in expansion of macro 'FPU_info'
FPU_info = info;
^~~~~~~~
arch/x86/math-emu/fpu_system.h:50:24: error: 'get_current()->thread.fpu.state' is a pointer; did you mean to use '->'?
#define FPU_info (I387->soft.info)
^
->
>> arch/x86/math-emu/fpu_system.h:58:24: note: in expansion of macro 'FPU_info'
#define FPU_ORIG_EIP (FPU_info->___orig_eip)
^~~~~~~~
>> arch/x86/math-emu/fpu_entry.c:128:2: note: in expansion of macro 'FPU_ORIG_EIP'
FPU_ORIG_EIP = FPU_EIP;
^~~~~~~~~~~~
arch/x86/math-emu/fpu_system.h:50:24: error: 'get_current()->thread.fpu.state' is a pointer; did you mean to use '->'?
#define FPU_info (I387->soft.info)
^
->
arch/x86/math-emu/fpu_system.h:57:20: note: in expansion of macro 'FPU_info'
#define FPU_EIP (FPU_info->regs->ip)
^~~~~~~~
>> arch/x86/math-emu/fpu_entry.c:128:17: note: in expansion of macro 'FPU_EIP'
FPU_ORIG_EIP = FPU_EIP;
^~~~~~~
arch/x86/math-emu/fpu_system.h:50:24: error: 'get_current()->thread.fpu.state' is a pointer; did you mean to use '->'?
#define FPU_info (I387->soft.info)
^
->
arch/x86/math-emu/fpu_system.h:56:22: note: in expansion of macro 'FPU_info'
#define FPU_EFLAGS (FPU_info->regs->flags)
^~~~~~~~
>> arch/x86/math-emu/fpu_entry.c:130:7: note: in expansion of macro 'FPU_EFLAGS'
if ((FPU_EFLAGS & 0x00020000) != 0) {
^~~~~~~~~~
arch/x86/math-emu/fpu_system.h:50:24: error: 'get_current()->thread.fpu.state' is a pointer; did you mean to use '->'?
#define FPU_info (I387->soft.info)
^
->
arch/x86/math-emu/fpu_system.h:57:20: note: in expansion of macro 'FPU_info'
#define FPU_EIP (FPU_info->regs->ip)
^~~~~~~~
arch/x86/math-emu/fpu_entry.c:133:3: note: in expansion of macro 'FPU_EIP'
FPU_EIP += code_base = FPU_CS << 4;
^~~~~~~
arch/x86/math-emu/fpu_system.h:50:24: error: 'get_current()->thread.fpu.state' is a pointer; did you mean to use '->'?
#define FPU_info (I387->soft.info)
^
->
arch/x86/math-emu/fpu_system.h:52:41: note: in expansion of macro 'FPU_info'
#define FPU_CS (*(unsigned short *) &(FPU_info->regs->cs))
^~~~~~~~
>> arch/x86/math-emu/fpu_entry.c:133:26: note: in expansion of macro 'FPU_CS'
FPU_EIP += code_base = FPU_CS << 4;
^~~~~~
arch/x86/math-emu/fpu_system.h:50:24: error: 'get_current()->thread.fpu.state' is a pointer; did you mean to use '->'?
#define FPU_info (I387->soft.info)
^
->
arch/x86/math-emu/fpu_system.h:52:41: note: in expansion of macro 'FPU_info'
#define FPU_CS (*(unsigned short *) &(FPU_info->regs->cs))
^~~~~~~~
arch/x86/math-emu/fpu_entry.c:135:13: note: in expansion of macro 'FPU_CS'
} else if (FPU_CS == __USER_CS && FPU_DS == __USER_DS) {
^~~~~~
arch/x86/math-emu/fpu_system.h:50:24: error: 'get_current()->thread.fpu.state' is a pointer; did you mean to use '->'?
#define FPU_info (I387->soft.info)
^
->
arch/x86/math-emu/fpu_system.h:54:41: note: in expansion of macro 'FPU_info'
#define FPU_DS (*(unsigned short *) &(FPU_info->regs->ds))
^~~~~~~~
>> arch/x86/math-emu/fpu_entry.c:135:36: note: in expansion of macro 'FPU_DS'
} else if (FPU_CS == __USER_CS && FPU_DS == __USER_DS) {
^~~~~~
arch/x86/math-emu/fpu_system.h:50:24: error: 'get_current()->thread.fpu.state' is a pointer; did you mean to use '->'?
#define FPU_info (I387->soft.info)
^
->
arch/x86/math-emu/fpu_system.h:52:41: note: in expansion of macro 'FPU_info'
#define FPU_CS (*(unsigned short *) &(FPU_info->regs->cs))
^~~~~~~~
arch/x86/math-emu/fpu_entry.c:137:13: note: in expansion of macro 'FPU_CS'
} else if (FPU_CS == __KERNEL_CS) {
^~~~~~
arch/x86/math-emu/fpu_system.h:50:24: error: 'get_current()->thread.fpu.state' is a pointer; did you mean to use '->'?
#define FPU_info (I387->soft.info)
^
->
arch/x86/math-emu/fpu_system.h:52:41: note: in expansion of macro 'FPU_info'
#define FPU_CS (*(unsigned short *) &(FPU_info->regs->cs))
^~~~~~~~
arch/x86/math-emu/fpu_entry.c:138:40: note: in expansion of macro 'FPU_CS'
printk("math_emulate: %04x:%08lx\n", FPU_CS, FPU_EIP);
^~~~~~
arch/x86/math-emu/fpu_system.h:50:24: error: 'get_current()->thread.fpu.state' is a pointer; did you mean to use '->'?
#define FPU_info (I387->soft.info)
^
->
arch/x86/math-emu/fpu_system.h:57:20: note: in expansion of macro 'FPU_info'
#define FPU_EIP (FPU_info->regs->ip)
^~~~~~~~
arch/x86/math-emu/fpu_entry.c:138:48: note: in expansion of macro 'FPU_EIP'
printk("math_emulate: %04x:%08lx\n", FPU_CS, FPU_EIP);
^~~~~~~
arch/x86/math-emu/fpu_system.h:50:24: error: 'get_current()->thread.fpu.state' is a pointer; did you mean to use '->'?
#define FPU_info (I387->soft.info)
^
->
arch/x86/math-emu/fpu_system.h:52:41: note: in expansion of macro 'FPU_info'
#define FPU_CS (*(unsigned short *) &(FPU_info->regs->cs))
^~~~~~~~
arch/x86/math-emu/fpu_entry.c:142:8: note: in expansion of macro 'FPU_CS'
if ((FPU_CS & 4) != 4) { /* Must be in the LDT */
^~~~~~
arch/x86/math-emu/fpu_system.h:50:24: error: 'get_current()->thread.fpu.state' is a pointer; did you mean to use '->'?
#define FPU_info (I387->soft.info)
^
->
arch/x86/math-emu/fpu_entry.c:146:15: note: in expansion of macro 'FPU_info'
math_abort(FPU_info, SIGILL);
^~~~~~~~
arch/x86/math-emu/fpu_system.h:50:24: error: 'get_current()->thread.fpu.state' is a pointer; did you mean to use '->'?
#define FPU_info (I387->soft.info)
^
->
arch/x86/math-emu/fpu_system.h:52:41: note: in expansion of macro 'FPU_info'
#define FPU_CS (*(unsigned short *) &(FPU_info->regs->cs))
^~~~~~~~
arch/x86/math-emu/fpu_entry.c:149:44: note: in expansion of macro 'FPU_CS'
code_descriptor = FPU_get_ldt_descriptor(FPU_CS);
^~~~~~
arch/x86/math-emu/fpu_system.h:50:24: error: 'get_current()->thread.fpu.state' is a pointer; did you mean to use '->'?
#define FPU_info (I387->soft.info)
^
->
arch/x86/math-emu/fpu_system.h:57:20: note: in expansion of macro 'FPU_info'
#define FPU_EIP (FPU_info->regs->ip)
^~~~~~~~
arch/x86/math-emu/fpu_entry.c:158:3: note: in expansion of macro 'FPU_EIP'
FPU_EIP += code_base = SEG_BASE_ADDR(code_descriptor);
^~~~~~~
arch/x86/math-emu/fpu_system.h:60:38: error: 'get_current()->thread.fpu.state' is a pointer; did you mean to use '->'?
#define FPU_lookahead (I387->soft.lookahead)
^
->
>> arch/x86/math-emu/fpu_entry.c:167:2: note: in expansion of macro 'FPU_lookahead'
FPU_lookahead = !(FPU_EFLAGS & X86_EFLAGS_TF);
^~~~~~~~~~~~~
arch/x86/math-emu/fpu_system.h:50:24: error: 'get_current()->thread.fpu.state' is a pointer; did you mean to use '->'?
#define FPU_info (I387->soft.info)
^
->
arch/x86/math-emu/fpu_system.h:56:22: note: in expansion of macro 'FPU_info'
#define FPU_EFLAGS (FPU_info->regs->flags)
^~~~~~~~
arch/x86/math-emu/fpu_entry.c:167:20: note: in expansion of macro 'FPU_EFLAGS'
FPU_lookahead = !(FPU_EFLAGS & X86_EFLAGS_TF);
^~~~~~~~~~
arch/x86/math-emu/fpu_system.h:50:24: error: 'get_current()->thread.fpu.state' is a pointer; did you mean to use '->'?
#define FPU_info (I387->soft.info)
^
->
arch/x86/math-emu/fpu_system.h:57:20: note: in expansion of macro 'FPU_info'
#define FPU_EIP (FPU_info->regs->ip)
^~~~~~~~
arch/x86/math-emu/fpu_entry.c:169:49: note: in expansion of macro 'FPU_EIP'
if (!valid_prefix(&byte1, (u_char __user **) & FPU_EIP,
^~~~~~~
arch/x86/math-emu/fpu_system.h:50:24: error: 'get_current()->thread.fpu.state' is a pointer; did you mean to use '->'?
#define FPU_info (I387->soft.info)
^
->
arch/x86/math-emu/fpu_entry.c:178:14: note: in expansion of macro 'FPU_info'
math_abort(FPU_info, SIGILL);
^~~~~~~~
arch/x86/math-emu/fpu_system.h:64:41: error: 'get_current()->thread.fpu.state' is a pointer; did you mean to use '->'?
#define no_ip_update (*(u_char *)&(I387->soft.no_update))
^
->
>> arch/x86/math-emu/fpu_entry.c:183:2: note: in expansion of macro 'no_ip_update'
no_ip_update = 0;
^~~~~~~~~~~~
arch/x86/math-emu/fpu_system.h:50:24: error: 'get_current()->thread.fpu.state' is a pointer; did you mean to use '->'?
#define FPU_info (I387->soft.info)
^
->
arch/x86/math-emu/fpu_system.h:57:20: note: in expansion of macro 'FPU_info'
#define FPU_EIP (FPU_info->regs->ip)
^~~~~~~~
arch/x86/math-emu/fpu_entry.c:185:2: note: in expansion of macro 'FPU_EIP'
FPU_EIP++; /* We have fetched the prefix and first code bytes. */
^~~~~~~
arch/x86/math-emu/fpu_system.h:50:24: error: 'get_current()->thread.fpu.state' is a pointer; did you mean to use '->'?
#define FPU_info (I387->soft.info)
^
->
arch/x86/math-emu/fpu_system.h:57:20: note: in expansion of macro 'FPU_info'
#define FPU_EIP (FPU_info->regs->ip)
^~~~~~~~
arch/x86/math-emu/fpu_entry.c:190:7: note: in expansion of macro 'FPU_EIP'
if (FPU_EIP > code_limit)
^~~~~~~
arch/x86/math-emu/fpu_system.h:50:24: error: 'get_current()->thread.fpu.state' is a pointer; did you mean to use '->'?
#define FPU_info (I387->soft.info)
^
->
arch/x86/math-emu/fpu_entry.c:191:15: note: in expansion of macro 'FPU_info'
math_abort(FPU_info, SIGSEGV);
^~~~~~~~
>> arch/x86/math-emu/fpu_system.h:71:30: error: 'get_current()->thread.fpu.state' is a pointer; did you mean to use '->'?
#define partial_status (I387->soft.swd)
^
->
>> arch/x86/math-emu/fpu_entry.c:196:8: note: in expansion of macro 'partial_status'
if (partial_status & SW_Summary)
^~~~~~~~~~~~~~
arch/x86/math-emu/fpu_system.h:50:24: error: 'get_current()->thread.fpu.state' is a pointer; did you mean to use '->'?
#define FPU_info (I387->soft.info)
^
->
arch/x86/math-emu/fpu_entry.c:203:14: note: in expansion of macro 'FPU_info'
math_abort(FPU_info, SIGILL);
^~~~~~~~
In file included from include/asm-generic/bug.h:4:0,
from arch/x86/include/asm/bug.h:35,
from include/linux/bug.h:4,
from include/linux/signal.h:4,
from arch/x86/math-emu/fpu_entry.c:27:
arch/x86/math-emu/fpu_system.h:50:24: error: 'get_current()->thread.fpu.state' is a pointer; did you mean to use '->'?
#define FPU_info (I387->soft.info)
^
->
include/linux/compiler.h:178:40: note: in definition of macro 'likely'
# define likely(x) __builtin_expect(!!(x), 1)
^
>> arch/x86/include/asm/uaccess.h:100:10: note: in expansion of macro '__range_not_ok'
likely(!__range_not_ok(addr, size, user_addr_max())); \
^~~~~~~~~~~~~~
>> arch/x86/math-emu/fpu_system.h:80:36: note: in expansion of macro 'access_ok'
#define FPU_access_ok(x,y,z) if ( !access_ok(x,y,z) ) \
^~~~~~~~~
>> arch/x86/math-emu/fpu_system.h:95:31: note: in expansion of macro 'FPU_access_ok'
#define FPU_code_access_ok(z) FPU_access_ok(VERIFY_READ,(void __user *)FPU_EIP,z)
^~~~~~~~~~~~~
arch/x86/math-emu/fpu_system.h:57:20: note: in expansion of macro 'FPU_info'
#define FPU_EIP (FPU_info->regs->ip)
^~~~~~~~
>> arch/x86/math-emu/fpu_system.h:95:72: note: in expansion of macro 'FPU_EIP'
#define FPU_code_access_ok(z) FPU_access_ok(VERIFY_READ,(void __user *)FPU_EIP,z)
^~~~~~~
>> arch/x86/math-emu/fpu_entry.c:208:2: note: in expansion of macro 'FPU_code_access_ok'
FPU_code_access_ok(1);
^~~~~~~~~~~~~~~~~~
In file included from arch/x86/math-emu/fpu_entry.c:35:0:
arch/x86/math-emu/fpu_system.h:50:24: error: 'get_current()->thread.fpu.state' is a pointer; did you mean to use '->'?
#define FPU_info (I387->soft.info)
^
->
arch/x86/math-emu/fpu_system.h:81:16: note: in expansion of macro 'FPU_info'
math_abort(FPU_info,SIGSEGV)
^~~~~~~~
>> arch/x86/math-emu/fpu_system.h:95:31: note: in expansion of macro 'FPU_access_ok'
#define FPU_code_access_ok(z) FPU_access_ok(VERIFY_READ,(void __user *)FPU_EIP,z)
^~~~~~~~~~~~~
..

vim +/init_fpregs_state +805 arch/x86/include/asm/processor.h

799
800 #define INIT_THREAD { \
801 .sp0 = TOP_OF_INIT_STACK, \
802 .sysenter_cs = __KERNEL_CS, \
803 .io_bitmap_ptr = NULL, \
804 .addr_limit = KERNEL_DS, \
> 805 .fpu.state = &init_fpregs_state, \
806 }
807
808 /*

---
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