Patch "powerpc/spufs: Fix coredump of SPU contexts" has been added to the 4.4-stable tree

This is a note to let you know that I've just added the patch titled

powerpc/spufs: Fix coredump of SPU contexts

to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
powerpc-spufs-fix-coredump-of-spu-contexts.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Michael Ellerman <[email protected]>
Date: Mon, 29 May 2017 20:26:07 +1000
Subject: powerpc/spufs: Fix coredump of SPU contexts

From: Michael Ellerman <[email protected]>

[ Upstream commit 99acc9bede06bbb2662aafff51f5b9e529fa845e ]

If a process dumps core while it has SPU contexts active then we have code to also dump information about the SPU contexts.

Unfortunately it's been broken for 3 1/2 years, and we didn't notice. In commit 7b1f4020d0d1 ("spufs: get rid of dump_emit() wrappers") the nread variable was removed and rc used instead. That means when the loop exits successfully, rc has the number of bytes read, but it's then used as the return value for the function, which should return 0 on success.

So fix it by setting rc = 0 before returning in the success case.

---
 arch/powerpc/platforms/cell/spufs/coredump.c |    2 ++
 1 file changed, 2 insertions(+)

@@ -174,6 +174,8 @@ static int spufs_arch_write_note(struct
 	if (!dump_skip(cprm,
 		       roundup(cprm->written - total + sz, 4) - cprm->written))
 		goto Eio;
+
+	rc = 0;
 out:
 	free_page((unsigned long)buf);
 	return rc;

Patches currently in stable-queue which might be from [email protected] are

queue-4.4/selftests-powerpc-fix-tm-resched-dscr-test-with-some-compilers.patch queue-4.4/powerpc-mm-fix-virt_addr_valid-etc.-on-64-bit-hash.patch queue-4.4/powerpc-spufs-fix-coredump-of-spu-contexts.patch queue-4.4/signal-powerpc-document-conflicts-with-si_user-and-sigfpe-and-sigtrap.patch queue-4.4/powerpc-don-t-clobber-tcr-when-setting-tcr.patch