On Mon, Jun 27, 2022 at 01:21:25PM +0200, Greg Kroah-Hartman wrote: > From: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx> > > [ Upstream commit 5d8de293c224896a4da99763fce4f9794308caf4 ] > > Patch series "Convert vmcore to use an iov_iter", v5. > > For some reason several people have been sending bad patches to fix > compiler warnings in vmcore recently. Here's how it should be done. > Compile-tested only on x86. As noted in the first patch, s390 should take > this conversion a bit further, but I'm not inclined to do that work > myself. > > This patch (of 3): > > Instead of passing in a 'buf' and 'userbuf' argument, pass in an iov_iter. > s390 needs more work to pass the iov_iter down further, or refactor, but > I'd be more comfortable if someone who can test on s390 did that work. > > It's more convenient to convert the whole of read_from_oldmem() to take an > iov_iter at the same time, so rename it to read_from_oldmem_iter() and add > a temporary read_from_oldmem() wrapper that creates an iov_iter. > > Link: https://lkml.kernel.org/r/20220408090636.560886-1-bhe@xxxxxxxxxx > Link: https://lkml.kernel.org/r/20220408090636.560886-2-bhe@xxxxxxxxxx > Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx> > Signed-off-by: Baoquan He <bhe@xxxxxxxxxx> > Reviewed-by: Christoph Hellwig <hch@xxxxxx> > Cc: Heiko Carstens <hca@xxxxxxxxxxxxx> > Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> > Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> > --- > arch/arm/kernel/crash_dump.c | 27 +++------------- > arch/arm64/kernel/crash_dump.c | 29 +++-------------- > arch/ia64/kernel/crash_dump.c | 32 +++---------------- > arch/mips/kernel/crash_dump.c | 27 +++------------- > arch/powerpc/kernel/crash_dump.c | 35 +++------------------ > arch/riscv/kernel/crash_dump.c | 26 +++------------ > arch/s390/kernel/crash_dump.c | 13 +++++--- > arch/sh/kernel/crash_dump.c | 29 +++-------------- > arch/x86/kernel/crash_dump_32.c | 29 +++-------------- > arch/x86/kernel/crash_dump_64.c | 41 +++++++----------------- > fs/proc/vmcore.c | 54 ++++++++++++++++++++------------ > include/linux/crash_dump.h | 9 +++--- > 12 files changed, 91 insertions(+), 260 deletions(-) This one breaks s390. You would also need to apply the following two commits: cc02e6e21aa5 ("s390/crash: add missing iterator advance in copy_oldmem_page()") af2debd58bd7 ("s390/crash: make copy_oldmem_page() return number of bytes copied")
