From 102a0743326a03cd1a1202ceda21e175b7d3575c Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Tue, 20 Feb 2024 01:20:52 +0000
Subject: [PATCH] add new system file
---
kernel/fs/eventfd.c | 7 +++++--
1 files changed, 5 insertions(+), 2 deletions(-)
diff --git a/kernel/fs/eventfd.c b/kernel/fs/eventfd.c
index 4a14295..3673eb8 100644
--- a/kernel/fs/eventfd.c
+++ b/kernel/fs/eventfd.c
@@ -187,11 +187,14 @@
return events;
}
-static void eventfd_ctx_do_read(struct eventfd_ctx *ctx, __u64 *cnt)
+void eventfd_ctx_do_read(struct eventfd_ctx *ctx, __u64 *cnt)
{
- *cnt = (ctx->flags & EFD_SEMAPHORE) ? 1 : ctx->count;
+ lockdep_assert_held(&ctx->wqh.lock);
+
+ *cnt = ((ctx->flags & EFD_SEMAPHORE) && ctx->count) ? 1 : ctx->count;
ctx->count -= *cnt;
}
+EXPORT_SYMBOL_GPL(eventfd_ctx_do_read);
/**
* eventfd_ctx_remove_wait_queue - Read the current counter and removes wait queue.
--
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