Messages in this thread Patch in this message | | | Date | Mon, 8 Apr 2024 14:52:29 -0700 | Subject | [PATCH v1] erofs: use raw_smp_processor_id() to get buffer from global buffer pool | From | Sandeep Dhavale <> |
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erofs will decompress in the preemptible context (kworker or per cpu thread). As smp_processor_id() cannot be used in preemptible contexts, use raw_smp_processor_id() instead to index into global buffer pool.
Reported-by: syzbot+27cc650ef45b379dfe5a@syzkaller.appspotmail.com Fixes: 7a7513292cc6 ("erofs: rename per-CPU buffers to global buffer pool and make it configurable") Signed-off-by: Sandeep Dhavale <dhavale@google.com> --- fs/erofs/zutil.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/fs/erofs/zutil.c b/fs/erofs/zutil.c index b9b99158bb4e..036024bce9f7 100644 --- a/fs/erofs/zutil.c +++ b/fs/erofs/zutil.c @@ -30,7 +30,7 @@ static struct shrinker *erofs_shrinker_info; static unsigned int z_erofs_gbuf_id(void) { - return smp_processor_id() % z_erofs_gbuf_count; + return raw_smp_processor_id() % z_erofs_gbuf_count; } void *z_erofs_get_gbuf(unsigned int requiredpages) -- 2.44.0.478.gd926399ef9-goog
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