5a0e3ad6af
percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_*.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). * x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: Tejun Heo <tj@kernel.org> Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
114 lines
2.8 KiB
C
114 lines
2.8 KiB
C
/*
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* linux/fs/binfmt_em86.c
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*
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* Based on linux/fs/binfmt_script.c
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* Copyright (C) 1996 Martin von Löwis
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* original #!-checking implemented by tytso.
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*
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* em86 changes Copyright (C) 1997 Jim Paradis
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*/
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#include <linux/module.h>
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#include <linux/string.h>
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#include <linux/stat.h>
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#include <linux/binfmts.h>
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#include <linux/elf.h>
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#include <linux/init.h>
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#include <linux/fs.h>
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#include <linux/file.h>
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#include <linux/errno.h>
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#define EM86_INTERP "/usr/bin/em86"
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#define EM86_I_NAME "em86"
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static int load_em86(struct linux_binprm *bprm,struct pt_regs *regs)
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{
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char *interp, *i_name, *i_arg;
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struct file * file;
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int retval;
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struct elfhdr elf_ex;
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/* Make sure this is a Linux/Intel ELF executable... */
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elf_ex = *((struct elfhdr *)bprm->buf);
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if (memcmp(elf_ex.e_ident, ELFMAG, SELFMAG) != 0)
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return -ENOEXEC;
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/* First of all, some simple consistency checks */
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if ((elf_ex.e_type != ET_EXEC && elf_ex.e_type != ET_DYN) ||
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(!((elf_ex.e_machine == EM_386) || (elf_ex.e_machine == EM_486))) ||
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(!bprm->file->f_op || !bprm->file->f_op->mmap)) {
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return -ENOEXEC;
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}
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bprm->recursion_depth++; /* Well, the bang-shell is implicit... */
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allow_write_access(bprm->file);
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fput(bprm->file);
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bprm->file = NULL;
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/* Unlike in the script case, we don't have to do any hairy
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* parsing to find our interpreter... it's hardcoded!
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*/
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interp = EM86_INTERP;
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i_name = EM86_I_NAME;
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i_arg = NULL; /* We reserve the right to add an arg later */
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/*
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* Splice in (1) the interpreter's name for argv[0]
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* (2) (optional) argument to interpreter
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* (3) filename of emulated file (replace argv[0])
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*
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* This is done in reverse order, because of how the
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* user environment and arguments are stored.
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*/
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remove_arg_zero(bprm);
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retval = copy_strings_kernel(1, &bprm->filename, bprm);
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if (retval < 0) return retval;
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bprm->argc++;
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if (i_arg) {
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retval = copy_strings_kernel(1, &i_arg, bprm);
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if (retval < 0) return retval;
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bprm->argc++;
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}
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retval = copy_strings_kernel(1, &i_name, bprm);
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if (retval < 0) return retval;
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bprm->argc++;
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/*
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* OK, now restart the process with the interpreter's inode.
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* Note that we use open_exec() as the name is now in kernel
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* space, and we don't need to copy it.
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*/
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file = open_exec(interp);
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if (IS_ERR(file))
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return PTR_ERR(file);
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bprm->file = file;
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retval = prepare_binprm(bprm);
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if (retval < 0)
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return retval;
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return search_binary_handler(bprm, regs);
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}
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static struct linux_binfmt em86_format = {
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.module = THIS_MODULE,
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.load_binary = load_em86,
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};
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static int __init init_em86_binfmt(void)
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{
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return register_binfmt(&em86_format);
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}
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static void __exit exit_em86_binfmt(void)
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{
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unregister_binfmt(&em86_format);
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}
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core_initcall(init_em86_binfmt);
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module_exit(exit_em86_binfmt);
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MODULE_LICENSE("GPL");
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