Bug 216090
| Summary: | GCC12: printk.h:446:44: error: using a dangling pointer to '__str' | ||
|---|---|---|---|
| Product: | Platform Specific/Hardware | Reporter: | Vitaly Chikunov (vt) |
| Component: | PPC-64 | Assignee: | platform_ppc-64 |
| Status: | CLOSED CODE_FIX | ||
| Severity: | normal | CC: | michael |
| Priority: | P1 | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Kernel Version: | 5.17.13 | Subsystem: | |
| Regression: | Yes | Bisected commit-id: | |
Linux kernel developers are well aware of the regressions related to GCC 12.x. Patches are being worked on. Fixed in 2a83afe72a2b ("powerpc/64: Drop ppc_inst_as_str()").
The warning has also been disabled in 49beadbd47c2 ("gcc-12: disable '-Wdangling-pointer' warning for now").
|
There is build error on GCC 12: [00:00:26] CC arch/powerpc/kernel/trace/ftrace.o [00:00:26] In file included from ./include/asm-generic/bug.h:22, [00:00:26] from ./arch/powerpc/include/asm/bug.h:149, [00:00:26] from ./include/linux/bug.h:5, [00:00:26] from ./include/linux/thread_info.h:13, [00:00:26] from ./include/asm-generic/preempt.h:5, [00:00:26] from ./arch/powerpc/include/generated/asm/preempt.h:1, [00:00:26] from ./include/linux/preempt.h:78, [00:00:26] from ./include/linux/spinlock.h:55, [00:00:26] from arch/powerpc/kernel/trace/ftrace.c:16: [00:00:26] arch/powerpc/kernel/trace/ftrace.c: In function 'ftrace_modify_code': [00:00:26] ./include/linux/printk.h:446:44: error: using a dangling pointer to '__str' [-Werror=dangling-pointer=] [00:00:26] 446 | #define printk(fmt, ...) printk_index_wrap(_printk, fmt, ##__VA_ARGS__) [00:00:26] | ^ [00:00:26] ./include/linux/printk.h:418:17: note: in definition of macro 'printk_index_wrap' [00:00:26] 418 | _p_func(_fmt, ##__VA_ARGS__); \ [00:00:26] | ^~~~~~~ [00:00:26] ./include/linux/printk.h:489:9: note: in expansion of macro 'printk' [00:00:26] 489 | printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__) [00:00:26] | ^~~~~~ [00:00:26] arch/powerpc/kernel/trace/ftrace.c:76:17: note: in expansion of macro 'pr_err' [00:00:26] 76 | pr_err("%p: replaced (%s) != old (%s)", [00:00:26] | ^~~~~~ [00:00:26] In file included from ./arch/powerpc/include/asm/code-patching.h:14, [00:00:26] from arch/powerpc/kernel/trace/ftrace.c:27: [00:00:26] ./arch/powerpc/include/asm/inst.h:156:14: note: '__str' declared here [00:00:26] 156 | char __str[PPC_INST_STR_LEN]; \ [00:00:26] | ^~~~~ [00:00:26] ./include/linux/printk.h:418:33: note: in expansion of macro 'ppc_inst_as_str' [00:00:26] 418 | _p_func(_fmt, ##__VA_ARGS__); \ [00:00:26] | ^~~~~~~~~~~ [00:00:26] ./include/linux/printk.h:446:26: note: in expansion of macro 'printk_index_wrap' [00:00:26] 446 | #define printk(fmt, ...) printk_index_wrap(_printk, fmt, ##__VA_ARGS__) This may be related discussion: https://lore.kernel.org/all/20220601162023.GW25951@gate.crashing.org/T/