linux-kernel - arch/ia64/kernel/ivt.S:759: Error: Operand 3 of `add' should be a general register r0-r3

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Date:   Sun, 11 Dec 2016 08:35:36 +0800
From:   kbuild test robot <fengguang.wu@...el.com>
To:     Will Deacon <will.deacon@....com>
Cc:     kbuild-all@...org, linux-kernel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linux Memory Management List <linux-mm@...ck.org>
Subject: arch/ia64/kernel/ivt.S:759: Error: Operand 3 of `add' should be a
 general register r0-r3

Hi Will,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   045169816b31b10faed984b01c390db1b32ee4c1
commit: da48d094ce5d7c7dcdad9011648a81c42fd1c2ef Kconfig: remove HAVE_LATENCYTOP_SUPPORT
date:   11 months ago
config: ia64-allmodconfig (attached as .config)
compiler: ia64-linux-gcc (GCC) 6.2.0
reproduce:
        wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        git checkout da48d094ce5d7c7dcdad9011648a81c42fd1c2ef
        # save the attached .config to linux build tree
        make.cross ARCH=ia64 

All errors (new ones prefixed by >>):

   arch/ia64/kernel/ivt.S: Assembler messages:
>> arch/ia64/kernel/ivt.S:759: Error: Operand 3 of `add' should be a general register r0-r3
--
   arch/ia64/kernel/entry.S: Assembler messages:
>> arch/ia64/kernel/entry.S:621: Error: Operand 2 of `adds' should be a 14-bit integer (-8192-8191)
   arch/ia64/kernel/entry.S:728: Error: Operand 2 of `adds' should be a 14-bit integer (-8192-8191)
   arch/ia64/kernel/entry.S:859: Error: Operand 2 of `adds' should be a 14-bit integer (-8192-8191)
--
   arch/ia64/kernel/fsys.S: Assembler messages:
>> arch/ia64/kernel/fsys.S:67: Error: Operand 3 of `add' should be a general register r0-r3
   arch/ia64/kernel/fsys.S:97: Error: Operand 3 of `add' should be a general register r0-r3
   arch/ia64/kernel/fsys.S:193: Error: Operand 3 of `add' should be a general register r0-r3
   arch/ia64/kernel/fsys.S:336: Error: Operand 3 of `add' should be a general register r0-r3
   arch/ia64/kernel/fsys.S:338: Error: Operand 3 of `add' should be a general register r0-r3

vim +759 arch/ia64/kernel/ivt.S

f8fa5448 David Mosberger-Tang 2005-04-27  743  	nop.m 0					// M
f8fa5448 David Mosberger-Tang 2005-04-27  744  	mov r20=r1				// A			save r1
f8fa5448 David Mosberger-Tang 2005-04-27  745  
f8fa5448 David Mosberger-Tang 2005-04-27  746  	nop.m 0
f8fa5448 David Mosberger-Tang 2005-04-27  747  	movl r30=sys_call_table			// X
f8fa5448 David Mosberger-Tang 2005-04-27  748  
498c5170 Isaku Yamahata       2008-05-19  749  	MOV_FROM_IIP(r28)			// M2 (2 cyc)
f8fa5448 David Mosberger-Tang 2005-04-27  750  	cmp.eq p0,p7=r18,r17			// I0 is this a system call?
f8fa5448 David Mosberger-Tang 2005-04-27  751  (p7)	br.cond.spnt non_syscall		// B  no ->
f8fa5448 David Mosberger-Tang 2005-04-27  752  	//
f8fa5448 David Mosberger-Tang 2005-04-27  753  	// From this point on, we are definitely on the syscall-path
f8fa5448 David Mosberger-Tang 2005-04-27  754  	// and we can use (non-banked) scratch registers.
f8fa5448 David Mosberger-Tang 2005-04-27  755  	//
f8fa5448 David Mosberger-Tang 2005-04-27  756  ///////////////////////////////////////////////////////////////////////
f8fa5448 David Mosberger-Tang 2005-04-27  757  	mov r1=r16				// A    move task-pointer to "addl"-addressable reg
f8fa5448 David Mosberger-Tang 2005-04-27  758  	mov r2=r16				// A    setup r2 for ia64_syscall_setup
f8fa5448 David Mosberger-Tang 2005-04-27 @759  	add r9=TI_FLAGS+IA64_TASK_SIZE,r16	// A	r9 = &current_thread_info()->flags
f8fa5448 David Mosberger-Tang 2005-04-27  760  
f8fa5448 David Mosberger-Tang 2005-04-27  761  	adds r16=IA64_TASK_THREAD_ON_USTACK_OFFSET,r16
f8fa5448 David Mosberger-Tang 2005-04-27  762  	adds r15=-1024,r15			// A    subtract 1024 from syscall number
^1da177e Linus Torvalds       2005-04-16  763  	mov r3=NR_syscalls - 1
^1da177e Linus Torvalds       2005-04-16  764  	;;
f8fa5448 David Mosberger-Tang 2005-04-27  765  	ld1.bias r17=[r16]			// M0|1 r17 = current->thread.on_ustack flag
f8fa5448 David Mosberger-Tang 2005-04-27  766  	ld4 r9=[r9]				// M0|1 r9 = current_thread_info()->flags
f8fa5448 David Mosberger-Tang 2005-04-27  767  	extr.u r8=r29,41,2			// I0   extract ei field from cr.ipsr

:::::: The code at line 759 was first introduced by commit
:::::: f8fa5448fc9b4a7806b1297a0b57808f12fe4d43 [IA64] Reschedule break_fault() for better performance.

:::::: TO: David Mosberger-Tang <davidm@....hp.com>
:::::: CC: Tony Luck <tony.luck@...el.com>

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