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scripts: recordmcount: break hardlinks 

commit dd39a26538e37f6c6131e829a4a510787e43c783 upstream.

recordmcount edits the file in-place, which can cause problems when
using ccache in hardlink mode.  Arrange for recordmcount to break a
hardlinked object.

Link: http://lkml.kernel.org/r/E1a7MVT-0000et-62@rmk-PC.arm.linux.org.uk

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Russell King 2015-12-11 12:09:03 +00:00 committed by Greg Kroah-Hartman
parent f80e6add95
commit 099e9d4f2c
1 changed files with 14 additions and 0 deletions
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14
scripts/recordmcount.c
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@ -189,6 +189,20 @@ static void *mmap_file(char const *fname)
addr = umalloc(sb.st_size);
uread(fd_map, addr, sb.st_size);
}
if (sb.st_nlink != 1) {
/* file is hard-linked, break the hard link */
close(fd_map);
if (unlink(fname) < 0) {
perror(fname);
fail_file();
}
fd_map = open(fname, O_RDWR | O_CREAT, sb.st_mode);
if (fd_map < 0) {
perror(fname);
fail_file();
}
uwrite(fd_map, addr, sb.st_size);
}
return addr;
}