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f833116ad2
Recently the kernel test robot reported:
> In file included from include/linux/kernel.h:29,
> from fs/binfmt_flat.c:21:
> fs/binfmt_flat.c: In function 'flat_core_dump':
> >> fs/binfmt_flat.c:121:50: error: invalid use of undefined type 'struct coredump_params'
> 121 | current->comm, current->pid, cprm->siginfo->si_signo);
> | ^~
> include/linux/printk.h:418:33: note: in definition of macro 'printk_index_wrap'
> 418 | _p_func(_fmt, ##__VA_ARGS__); \
> | ^~~~~~~~~~~
> include/linux/printk.h:499:9: note: in expansion of macro 'printk'
> 499 | printk(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)
> | ^~~~~~
> fs/binfmt_flat.c:120:9: note: in expansion of macro 'pr_warn'
> 120 | pr_warn("Process %s:%d received signr %d and should have core dumped\n",
> | ^~~~~~~
> At top level:
> fs/binfmt_flat.c:118:12: warning: 'flat_core_dump' defined but not used [-Wunused-function]
> 118 | static int flat_core_dump(struct coredump_params *cprm)
> | ^~~~~~~~~~~~~~
The little dinky do nothing function flat_core_dump has always been
compiled unconditionally. With my change to move coredump_params into
coredump.h coredump_params reasonably becomes unavailable when
coredump support is not compiled in. Fix this old issue by simply not
compiling flat_core_dump when coredump support is not supported.
Fixes:
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.