Messages in this thread | | | Date | Thu, 26 May 2022 16:17:15 +0700 | From | Bagas Sanjaya <> | Subject | dangling pointer to '__str' error on ppc64_defconfig, GCC 12.1.0 |
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Hi everyone,
Attempting to build ppc64_defconfig kernel with powerpc64-unknown-linux-gnu (GCC 12.1.0) on v5.18, I got build error on ftrace.o:
CC arch/powerpc/kernel/trace/ftrace.o CC init/init_task.o In file included from ./include/asm-generic/bug.h:22, from ./arch/powerpc/include/asm/bug.h:156, from ./include/linux/bug.h:5, from ./include/linux/thread_info.h:13, from ./include/asm-generic/preempt.h:5, from ./arch/powerpc/include/generated/asm/preempt.h:1, from ./include/linux/preempt.h:78, from ./include/linux/spinlock.h:55, from arch/powerpc/kernel/trace/ftrace.c:16: arch/powerpc/kernel/trace/ftrace.c: In function 'ftrace_modify_code': ./include/linux/printk.h:446:44: error: using a dangling pointer to '__str' [-Werror=dangling-pointer=] 446 | #define printk(fmt, ...) printk_index_wrap(_printk, fmt, ##__VA_ARGS__) | ^ ./include/linux/printk.h:418:17: note: in definition of macro 'printk_index_wrap' 418 | _p_func(_fmt, ##__VA_ARGS__); \ | ^~~~~~~ ./include/linux/printk.h:489:9: note: in expansion of macro 'printk' 489 | printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__) | ^~~~~~ arch/powerpc/kernel/trace/ftrace.c:75:17: note: in expansion of macro 'pr_err' 75 | pr_err("%p: replaced (%s) != old (%s)", | ^~~~~~ In file included from ./arch/powerpc/include/asm/code-patching.h:14, from arch/powerpc/kernel/trace/ftrace.c:26: ./arch/powerpc/include/asm/inst.h:156:14: note: '__str' declared here 156 | char __str[PPC_INST_STR_LEN]; \ | ^~~~~ ./include/linux/printk.h:418:33: note: in expansion of macro 'ppc_inst_as_str' 418 | _p_func(_fmt, ##__VA_ARGS__); \ | ^~~~~~~~~~~ ./include/linux/printk.h:446:26: note: in expansion of macro 'printk_index_wrap' 446 | #define printk(fmt, ...) printk_index_wrap(_printk, fmt, ##__VA_ARGS__) | ^~~~~~~~~~~~~~~~~ ./include/linux/printk.h:489:9: note: in expansion of macro 'printk' 489 | printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__) | ^~~~~~ arch/powerpc/kernel/trace/ftrace.c:75:17: note: in expansion of macro 'pr_err' 75 | pr_err("%p: replaced (%s) != old (%s)", | ^~~~~~ arch/powerpc/kernel/trace/ftrace.c: In function '__ftrace_make_nop_kernel': ./include/linux/printk.h:446:44: error: using a dangling pointer to '__str' [-Werror=dangling-pointer=] 446 | #define printk(fmt, ...) printk_index_wrap(_printk, fmt, ##__VA_ARGS__) | ^ ./include/linux/printk.h:418:17: note: in definition of macro 'printk_index_wrap' 418 | _p_func(_fmt, ##__VA_ARGS__); \ | ^~~~~~~ ./include/linux/printk.h:489:9: note: in expansion of macro 'printk' 489 | printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__) | ^~~~~~ arch/powerpc/kernel/trace/ftrace.c:379:17: note: in expansion of macro 'pr_err' 379 | pr_err("Not expected bl: opcode is %s\n", ppc_inst_as_str(op)); | ^~~~~~ ./arch/powerpc/include/asm/inst.h:156:14: note: '__str' declared here 156 | char __str[PPC_INST_STR_LEN]; \ | ^~~~~ ./include/linux/printk.h:418:33: note: in expansion of macro 'ppc_inst_as_str' 418 | _p_func(_fmt, ##__VA_ARGS__); \ | ^~~~~~~~~~~ ./include/linux/printk.h:446:26: note: in expansion of macro 'printk_index_wrap' 446 | #define printk(fmt, ...) printk_index_wrap(_printk, fmt, ##__VA_ARGS__) | ^~~~~~~~~~~~~~~~~ ./include/linux/printk.h:489:9: note: in expansion of macro 'printk' 489 | printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__) | ^~~~~~ arch/powerpc/kernel/trace/ftrace.c:379:17: note: in expansion of macro 'pr_err' 379 | pr_err("Not expected bl: opcode is %s\n", ppc_inst_as_str(op)); | ^~~~~~ arch/powerpc/kernel/trace/ftrace.c: In function '__ftrace_make_call_kernel': ./include/linux/printk.h:446:44: error: using a dangling pointer to '__str' [-Werror=dangling-pointer=] 446 | #define printk(fmt, ...) printk_index_wrap(_printk, fmt, ##__VA_ARGS__) | ^ ./include/linux/printk.h:418:17: note: in definition of macro 'printk_index_wrap' 418 | _p_func(_fmt, ##__VA_ARGS__); \ | ^~~~~~~ ./include/linux/printk.h:489:9: note: in expansion of macro 'printk' 489 | printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__) | ^~~~~~ arch/powerpc/kernel/trace/ftrace.c:638:17: note: in expansion of macro 'pr_err' 638 | pr_err("Unexpected call sequence at %p: %s\n", ip, ppc_inst_as_str(op)); | ^~~~~~ ./arch/powerpc/include/asm/inst.h:156:14: note: '__str' declared here 156 | char __str[PPC_INST_STR_LEN]; \ | ^~~~~ ./include/linux/printk.h:418:33: note: in expansion of macro 'ppc_inst_as_str' 418 | _p_func(_fmt, ##__VA_ARGS__); \ | ^~~~~~~~~~~ ./include/linux/printk.h:446:26: note: in expansion of macro 'printk_index_wrap' 446 | #define printk(fmt, ...) printk_index_wrap(_printk, fmt, ##__VA_ARGS__) | ^~~~~~~~~~~~~~~~~ ./include/linux/printk.h:489:9: note: in expansion of macro 'printk' 489 | printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__) | ^~~~~~ arch/powerpc/kernel/trace/ftrace.c:638:17: note: in expansion of macro 'pr_err' 638 | pr_err("Unexpected call sequence at %p: %s\n", ip, ppc_inst_as_str(op)); | ^~~~~~ arch/powerpc/kernel/trace/ftrace.c: In function '__ftrace_make_nop': ./include/linux/printk.h:446:44: error: using a dangling pointer to '__str' [-Werror=dangling-pointer=] 446 | #define printk(fmt, ...) printk_index_wrap(_printk, fmt, ##__VA_ARGS__) | ^ ./include/linux/printk.h:418:17: note: in definition of macro 'printk_index_wrap' 418 | _p_func(_fmt, ##__VA_ARGS__); \ | ^~~~~~~ ./include/linux/printk.h:489:9: note: in expansion of macro 'printk' 489 | printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__) | ^~~~~~ arch/powerpc/kernel/trace/ftrace.c:205:17: note: in expansion of macro 'pr_err' 205 | pr_err("Expected %08lx found %s\n", PPC_INST_LD_TOC, ppc_inst_as_str(op)); | ^~~~~~ ./arch/powerpc/include/asm/inst.h:156:14: note: '__str' declared here 156 | char __str[PPC_INST_STR_LEN]; \ | ^~~~~ ./include/linux/printk.h:418:33: note: in expansion of macro 'ppc_inst_as_str' 418 | _p_func(_fmt, ##__VA_ARGS__); \ | ^~~~~~~~~~~ ./include/linux/printk.h:446:26: note: in expansion of macro 'printk_index_wrap' 446 | #define printk(fmt, ...) printk_index_wrap(_printk, fmt, ##__VA_ARGS__) | ^~~~~~~~~~~~~~~~~ ./include/linux/printk.h:489:9: note: in expansion of macro 'printk' 489 | printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__) | ^~~~~~ arch/powerpc/kernel/trace/ftrace.c:205:17: note: in expansion of macro 'pr_err' 205 | pr_err("Expected %08lx found %s\n", PPC_INST_LD_TOC, ppc_inst_as_str(op)); | ^~~~~~ ./include/linux/printk.h:446:44: error: using a dangling pointer to '__str' [-Werror=dangling-pointer=] 446 | #define printk(fmt, ...) printk_index_wrap(_printk, fmt, ##__VA_ARGS__) | ^ ./include/linux/printk.h:418:17: note: in definition of macro 'printk_index_wrap' 418 | _p_func(_fmt, ##__VA_ARGS__); \ | ^~~~~~~ ./include/linux/printk.h:489:9: note: in expansion of macro 'printk' 489 | printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__) | ^~~~~~ arch/powerpc/kernel/trace/ftrace.c:139:17: note: in expansion of macro 'pr_err' 139 | pr_err("Not expected bl: opcode is %s\n", ppc_inst_as_str(op)); | ^~~~~~ ./arch/powerpc/include/asm/inst.h:156:14: note: '__str' declared here 156 | char __str[PPC_INST_STR_LEN]; \ | ^~~~~ ./include/linux/printk.h:418:33: note: in expansion of macro 'ppc_inst_as_str' 418 | _p_func(_fmt, ##__VA_ARGS__); \ | ^~~~~~~~~~~ ./include/linux/printk.h:446:26: note: in expansion of macro 'printk_index_wrap' 446 | #define printk(fmt, ...) printk_index_wrap(_printk, fmt, ##__VA_ARGS__) | ^~~~~~~~~~~~~~~~~ ./include/linux/printk.h:489:9: note: in expansion of macro 'printk' 489 | printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__) | ^~~~~~ arch/powerpc/kernel/trace/ftrace.c:139:17: note: in expansion of macro 'pr_err' 139 | pr_err("Not expected bl: opcode is %s\n", ppc_inst_as_str(op)); | ^~~~~~ arch/powerpc/kernel/trace/ftrace.c: In function '__ftrace_make_call': ./include/linux/printk.h:446:44: error: using a dangling pointer to '__str' [-Werror=dangling-pointer=] 446 | #define printk(fmt, ...) printk_index_wrap(_printk, fmt, ##__VA_ARGS__) | ^ ./include/linux/printk.h:418:17: note: in definition of macro 'printk_index_wrap' 418 | _p_func(_fmt, ##__VA_ARGS__); \ | ^~~~~~~ ./include/linux/printk.h:489:9: note: in expansion of macro 'printk' 489 | printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__) | ^~~~~~ arch/powerpc/kernel/trace/ftrace.c:506:17: note: in expansion of macro 'pr_err' 506 | pr_err("Unexpected call sequence at %p: %s %s\n", | ^~~~~~ ./arch/powerpc/include/asm/inst.h:156:14: note: '__str' declared here 156 | char __str[PPC_INST_STR_LEN]; \ | ^~~~~ ./include/linux/printk.h:418:33: note: in expansion of macro 'ppc_inst_as_str' 418 | _p_func(_fmt, ##__VA_ARGS__); \ | ^~~~~~~~~~~ ./include/linux/printk.h:446:26: note: in expansion of macro 'printk_index_wrap' 446 | #define printk(fmt, ...) printk_index_wrap(_printk, fmt, ##__VA_ARGS__) | ^~~~~~~~~~~~~~~~~ ./include/linux/printk.h:489:9: note: in expansion of macro 'printk' 489 | printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__) | ^~~~~~ arch/powerpc/kernel/trace/ftrace.c:506:17: note: in expansion of macro 'pr_err' 506 | pr_err("Unexpected call sequence at %p: %s %s\n", | ^~~~~~ cc1: all warnings being treated as errors make[3]: *** [scripts/Makefile.build:288: arch/powerpc/kernel/trace/ftrace.o] Error 1
I also hit this error on current master (commit babf0bb978e3c9 ("Merge tag 'xfs-5.19-for-linus' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux")).
Thanks.
Reported-by: Bagas Sanjaya <bagasdotme@gmail.com>
-- An old man doll... just what I always wanted! - Clara
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