Hi, On 06/24/2016 12:00 PM, kbuild test robot wrote: > tree: https://git.kernel.org/pub/scm/linux/kernel/git/mel/linux mm-vmscan-node-lru-v8r12 > head: 572d76872348caf13577b82f35e4f1869fd79681 > commit: 6a8bfa2685fa2969d95b16470c846175c0ded7a4 [185/295] dynamic_debug: add jump label support > config: arm-allyesconfig (attached as .config) > compiler: arm-linux-gnueabi-gcc (Debian 5.3.1-8) 5.3.1 20160205 > 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 6a8bfa2685fa2969d95b16470c846175c0ded7a4 > # save the attached .config to linux build tree > make.cross ARCH=arm > > All error/warnings (new ones prefixed by >>): > > In file included from include/linux/compiler.h:60:0, > from include/linux/linkage.h:4, > from include/linux/kernel.h:6, > from drivers/crypto/ux500/cryp/cryp_irq.c:11: > arch/arm/include/asm/jump_label.h: In function 'cryp_enable_irq_src': >>> include/linux/compiler-gcc.h:243:38: warning: asm operand 0 probably doesn't match constraints > #define asm_volatile_goto(x...) do { asm goto(x); asm (""); } while (0) > In drivers/crypto/ux500/cryp/Makefile, there is an explicit setting to disable gcc optimizations: ifdef CONFIG_CRYPTO_DEV_UX500_DEBUG CFLAGS_cryp_core.o := -DDEBUG -O0 CFLAGS_cryp.o := -DDEBUG -O0 CFLAGS_cryp_irq.o := -DDEBUG -O0 endif If I change those to -O1 or -O2, it seems to build fine, strange...I was able to reproduce this with gcc 4.9.0 as well. Thanks, -Jason ^ >>> arch/arm/include/asm/jump_label.h:13:2: note: in expansion of macro 'asm_volatile_goto' > asm_volatile_goto("1:\n\t" > ^ >>> include/linux/compiler-gcc.h:243:38: error: impossible constraint in 'asm' > #define asm_volatile_goto(x...) do { asm goto(x); asm (""); } while (0) > ^ >>> arch/arm/include/asm/jump_label.h:13:2: note: in expansion of macro 'asm_volatile_goto' > asm_volatile_goto("1:\n\t" > ^ > arch/arm/include/asm/jump_label.h: In function 'cryp_disable_irq_src': >>> include/linux/compiler-gcc.h:243:38: warning: asm operand 0 probably doesn't match constraints > #define asm_volatile_goto(x...) do { asm goto(x); asm (""); } while (0) > ^ >>> arch/arm/include/asm/jump_label.h:13:2: note: in expansion of macro 'asm_volatile_goto' > asm_volatile_goto("1:\n\t" > ^ > -- > In file included from include/linux/compiler.h:60:0, > from include/linux/err.h:4, > from include/linux/clk.h:15, > from drivers/crypto/ux500/cryp/cryp_core.c:12: > arch/arm/include/asm/jump_label.h: In function 'cryp_interrupt_handler': >>> include/linux/compiler-gcc.h:243:38: warning: asm operand 0 probably doesn't match constraints > #define asm_volatile_goto(x...) do { asm goto(x); asm (""); } while (0) > ^ >>> arch/arm/include/asm/jump_label.h:13:2: note: in expansion of macro 'asm_volatile_goto' > asm_volatile_goto("1:\n\t" > ^ >>> include/linux/compiler-gcc.h:243:38: error: impossible constraint in 'asm' > #define asm_volatile_goto(x...) do { asm goto(x); asm (""); } while (0) > ^ >>> arch/arm/include/asm/jump_label.h:13:2: note: in expansion of macro 'asm_volatile_goto' > asm_volatile_goto("1:\n\t" > ^ > arch/arm/include/asm/jump_label.h: In function 'cfg_iv': >>> include/linux/compiler-gcc.h:243:38: warning: asm operand 0 probably doesn't match constraints > #define asm_volatile_goto(x...) do { asm goto(x); asm (""); } while (0) > ^ >>> arch/arm/include/asm/jump_label.h:13:2: note: in expansion of macro 'asm_volatile_goto' > asm_volatile_goto("1:\n\t" > ^ > arch/arm/include/asm/jump_label.h: In function 'cfg_ivs': >>> include/linux/compiler-gcc.h:243:38: warning: asm operand 0 probably doesn't match constraints > #define asm_volatile_goto(x...) do { asm goto(x); asm (""); } while (0) > ^ >>> arch/arm/include/asm/jump_label.h:13:2: note: in expansion of macro 'asm_volatile_goto' > asm_volatile_goto("1:\n\t" > ^ > arch/arm/include/asm/jump_label.h: In function 'set_key': >>> include/linux/compiler-gcc.h:243:38: warning: asm operand 0 probably doesn't match constraints > #define asm_volatile_goto(x...) do { asm goto(x); asm (""); } while (0) > ^ >>> arch/arm/include/asm/jump_label.h:13:2: note: in expansion of macro 'asm_volatile_goto' > asm_volatile_goto("1:\n\t" > ^ > arch/arm/include/asm/jump_label.h: In function 'cfg_keys': >>> include/linux/compiler-gcc.h:243:38: warning: asm operand 0 probably doesn't match constraints > #define asm_volatile_goto(x...) do { asm goto(x); asm (""); } while (0) > ^ >>> arch/arm/include/asm/jump_label.h:13:2: note: in expansion of macro 'asm_volatile_goto' > asm_volatile_goto("1:\n\t" > ^ > arch/arm/include/asm/jump_label.h: In function 'cryp_get_device_data': >>> include/linux/compiler-gcc.h:243:38: warning: asm operand 0 probably doesn't match constraints > #define asm_volatile_goto(x...) do { asm goto(x); asm (""); } while (0) > ^ >>> arch/arm/include/asm/jump_label.h:13:2: note: in expansion of macro 'asm_volatile_goto' > asm_volatile_goto("1:\n\t" > ^ > arch/arm/include/asm/jump_label.h: In function 'cryp_dma_out_callback': >>> include/linux/compiler-gcc.h:243:38: warning: asm operand 0 probably doesn't match constraints > #define asm_volatile_goto(x...) do { asm goto(x); asm (""); } while (0) > ^ >>> arch/arm/include/asm/jump_label.h:13:2: note: in expansion of macro 'asm_volatile_goto' > asm_volatile_goto("1:\n\t" > ^ > arch/arm/include/asm/jump_label.h: In function 'cryp_set_dma_transfer': >>> include/linux/compiler-gcc.h:243:38: warning: asm operand 0 probably doesn't match constraints > #define asm_volatile_goto(x...) do { asm goto(x); asm (""); } while (0) > ^ >>> arch/arm/include/asm/jump_label.h:13:2: note: in expansion of macro 'asm_volatile_goto' > asm_volatile_goto("1:\n\t" > ^ >>> include/linux/compiler-gcc.h:243:38: warning: asm operand 0 probably doesn't match constraints > #define asm_volatile_goto(x...) do { asm goto(x); asm (""); } while (0) > ^ >>> arch/arm/include/asm/jump_label.h:13:2: note: in expansion of macro 'asm_volatile_goto' > asm_volatile_goto("1:\n\t" > ^ > > vim +/asm_volatile_goto +13 arch/arm/include/asm/jump_label.h > > 09f05d85 Rabin Vincent 2012-02-18 1 #ifndef _ASM_ARM_JUMP_LABEL_H > 09f05d85 Rabin Vincent 2012-02-18 2 #define _ASM_ARM_JUMP_LABEL_H > 09f05d85 Rabin Vincent 2012-02-18 3 > 55dd0df7 Anton Blanchard 2015-04-09 4 #ifndef __ASSEMBLY__ > 09f05d85 Rabin Vincent 2012-02-18 5 > 09f05d85 Rabin Vincent 2012-02-18 6 #include <linux/types.h> > 11276d53 Peter Zijlstra 2015-07-24 7 #include <asm/unified.h> > 09f05d85 Rabin Vincent 2012-02-18 8 > 09f05d85 Rabin Vincent 2012-02-18 9 #define JUMP_LABEL_NOP_SIZE 4 > 09f05d85 Rabin Vincent 2012-02-18 10 > 11276d53 Peter Zijlstra 2015-07-24 11 static __always_inline bool arch_static_branch(struct static_key *key, bool branch) > 11276d53 Peter Zijlstra 2015-07-24 12 { > 11276d53 Peter Zijlstra 2015-07-24 @13 asm_volatile_goto("1:\n\t" > 11276d53 Peter Zijlstra 2015-07-24 14 WASM(nop) "\n\t" > 11276d53 Peter Zijlstra 2015-07-24 15 ".pushsection __jump_table, \"aw\"\n\t" > 11276d53 Peter Zijlstra 2015-07-24 16 ".word 1b, %l[l_yes], %c0\n\t" > 11276d53 Peter Zijlstra 2015-07-24 17 ".popsection\n\t" > 11276d53 Peter Zijlstra 2015-07-24 18 : : "i" (&((char *)key)[branch]) : : l_yes); > 11276d53 Peter Zijlstra 2015-07-24 19 > 11276d53 Peter Zijlstra 2015-07-24 20 return false; > 11276d53 Peter Zijlstra 2015-07-24 21 l_yes: > > :::::: The code at line 13 was first introduced by commit > :::::: 11276d5306b8e5b438a36bbff855fe792d7eaa61 locking/static_keys: Add a new static_key interface > > :::::: TO: Peter Zijlstra <peterz@xxxxxxxxxxxxx> > :::::: CC: Ingo Molnar <mingo@xxxxxxxxxx> > > --- > 0-DAY kernel test infrastructure Open Source Technology Center > https://lists.01.org/pipermail/kbuild-all Intel Corporation > -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. 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