3.18-stable review patch. If anyone has any objections, please let me know.
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From: Russell King rmk+kernel@arm.linux.org.uk
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
Cc: stable@vger.kernel.org # 2.6.37+ Signed-off-by: Russell King rmk+kernel@arm.linux.org.uk Signed-off-by: Steven Rostedt rostedt@goodmis.org Cc: Arnd Bergmann arnd@arndb.de Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- scripts/recordmcount.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+)
--- a/scripts/recordmcount.c +++ b/scripts/recordmcount.c @@ -201,6 +201,20 @@ 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; }