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| author | Matthew Wilcox (Oracle) <willy@infradead.org> | 2022-04-30 00:37:59 +0300 |
|---|---|---|
| committer | akpm <akpm@linux-foundation.org> | 2022-04-30 00:37:59 +0300 |
| commit | 5d8de293c224896a4da99763fce4f9794308caf4 (patch) | |
| tree | 06554517aca8f686fdc890da04dd811c1254c995 /arch/s390 | |
| parent | 04d168c6d42d1772d35372301a14bb20784c81c5 (diff) | |
| download | linux-5d8de293c224896a4da99763fce4f9794308caf4.tar.xz | |
vmcore: convert copy_oldmem_page() to take an iov_iter
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@redhat.com
Link: https://lkml.kernel.org/r/20220408090636.560886-2-bhe@redhat.com
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Baoquan He <bhe@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Cc: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'arch/s390')
| -rw-r--r-- | arch/s390/kernel/crash_dump.c | 13 |
1 files changed, 8 insertions, 5 deletions
diff --git a/arch/s390/kernel/crash_dump.c b/arch/s390/kernel/crash_dump.c index 69819b765250..a2c1c55daec0 100644 --- a/arch/s390/kernel/crash_dump.c +++ b/arch/s390/kernel/crash_dump.c @@ -15,6 +15,7 @@ #include <linux/slab.h> #include <linux/memblock.h> #include <linux/elf.h> +#include <linux/uio.h> #include <asm/asm-offsets.h> #include <asm/os_info.h> #include <asm/elf.h> @@ -212,8 +213,8 @@ static int copy_oldmem_user(void __user *dst, unsigned long src, size_t count) /* * Copy one page from "oldmem" */ -ssize_t copy_oldmem_page(unsigned long pfn, char *buf, size_t csize, - unsigned long offset, int userbuf) +ssize_t copy_oldmem_page(struct iov_iter *iter, unsigned long pfn, size_t csize, + unsigned long offset) { unsigned long src; int rc; @@ -221,10 +222,12 @@ ssize_t copy_oldmem_page(unsigned long pfn, char *buf, size_t csize, if (!csize) return 0; src = pfn_to_phys(pfn) + offset; - if (userbuf) - rc = copy_oldmem_user((void __force __user *) buf, src, csize); + + /* XXX: pass the iov_iter down to a common function */ + if (iter_is_iovec(iter)) + rc = copy_oldmem_user(iter->iov->iov_base, src, csize); else - rc = copy_oldmem_kernel((void *) buf, src, csize); + rc = copy_oldmem_kernel(iter->kvec->iov_base, src, csize); return rc; } |