diff options
| author | Alexander Potapenko <glider@google.com> | 2022-09-15 17:04:02 +0200 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2022-10-03 14:03:23 -0700 |
| commit | 11b331f857b5fc3ff76bfec36c44a137a6b37de1 (patch) | |
| tree | 1022a84d8360bb61f1766bde51a5e79254a985ae /block | |
| parent | f630a5d0ca59a6e73b61e3f82c371dc230da99ff (diff) | |
| download | lwn-11b331f857b5fc3ff76bfec36c44a137a6b37de1.tar.gz lwn-11b331f857b5fc3ff76bfec36c44a137a6b37de1.zip | |
block: kmsan: skip bio block merging logic for KMSAN
KMSAN doesn't allow treating adjacent memory pages as such, if they were
allocated by different alloc_pages() calls. The block layer however does
so: adjacent pages end up being used together. To prevent this, make
page_is_mergeable() return false under KMSAN.
Link: https://lkml.kernel.org/r/20220915150417.722975-29-glider@google.com
Signed-off-by: Alexander Potapenko <glider@google.com>
Suggested-by: Eric Biggers <ebiggers@google.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Andrey Konovalov <andreyknvl@gmail.com>
Cc: Andrey Konovalov <andreyknvl@google.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Christoph Lameter <cl@linux.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Eric Biggers <ebiggers@kernel.org>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: Ilya Leoshkevich <iii@linux.ibm.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Marco Elver <elver@google.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Michael S. Tsirkin <mst@redhat.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Petr Mladek <pmladek@suse.com>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: Vegard Nossum <vegard.nossum@oracle.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'block')
| -rw-r--r-- | block/bio.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/block/bio.c b/block/bio.c index 3d3a2678fea2..106ef14f28c2 100644 --- a/block/bio.c +++ b/block/bio.c @@ -869,6 +869,8 @@ static inline bool page_is_mergeable(const struct bio_vec *bv, *same_page = ((vec_end_addr & PAGE_MASK) == page_addr); if (*same_page) return true; + else if (IS_ENABLED(CONFIG_KMSAN)) + return false; return (bv->bv_page + bv_end / PAGE_SIZE) == (page + off / PAGE_SIZE); } |