Commit dd39a265 authored Dec 11, 2015 by Russell King Committed by Steven Rostedt Dec 16, 2015

scripts: recordmcount: break hardlinks

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>

parent 9f9499ae

scripts/recordmcount.c

+14 −0

Original line number	Diff line number	Diff line
		@@ -211,6 +211,20 @@ 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;
		}