Greg Kroah-Hartman gregkh@linuxfoundation.org writes:
On Thu, Aug 15, 2019 at 02:55:42PM +1000, Alastair D'Silva wrote:
From: Alastair D'Silva alastair@d-silva.org
Heads Up: This patch cannot be submitted to Linus's tree, as the affected assembler functions have already been converted to C.
That was done in upstream commit:
22e9c88d486a ("powerpc/64: reuse PPC32 static inline flush_dcache_range()")
Which is a larger change that we don't want to backport. This patch is a minimal fix for stable trees.
When calling flush_(inval_)dcache_range with a size >4GB, we were masking off the upper 32 bits, so we would incorrectly flush a range smaller than intended.
This patch replaces the 32 bit shifts with 64 bit ones, so that the full size is accounted for.
Signed-off-by: Alastair D'Silva alastair@d-silva.org
arch/powerpc/kernel/misc_64.S | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
Acked-by: Michael Ellerman mpe@ellerman.id.au
<formletter>
This is not the correct way to submit patches for inclusion in the stable kernel tree. Please read: https://www.kernel.org/doc/html/latest/process/stable-kernel-rules.html for how to do this properly.
</formletter>
Hi Greg,
This is "option 3", submit the patch directly, and the patch "deviates from the original upstream patch" because the upstream patch was a wholesale conversion from asm to C.
This patch applies cleanly to v4.14 and v4.19.
The change log should have mentioned which upstream patch it is not a backport of, is there anything else we should have done differently to avoid the formletter bot :)
cheers