tracing: Have seq_buf use full buffer (8cd709ae) · Commits · 戴 / test

include/linux/seq_buf.h

+3 −3

Original line number	Diff line number	Diff line
		@@ -43,13 +43,13 @@ seq_buf_init(struct seq_buf s, unsigned char buf, unsigned int size)
		static inline bool
		seq_buf_has_overflowed(struct seq_buf *s)
		{
		return s->len == s->size;
		return s->len > s->size;
		}

		static inline void
		seq_buf_set_overflow(struct seq_buf *s)
		{
		s->len = s->size;
		s->len = s->size + 1;
		}

		/*
		@@ -61,7 +61,7 @@ seq_buf_buffer_left(struct seq_buf *s)
		if (seq_buf_has_overflowed(s))
		return 0;

		return (s->size - 1) - s->len;
		return s->size - s->len;
		}

		/* How much buffer was written? */

+6 −3

Original line number	Diff line number	Diff line
		@@ -26,7 +26,7 @@
		*/
		static bool seq_buf_can_fit(struct seq_buf *s, size_t len)
		{
		return s->len + len < s->size;
		return s->len + len <= s->size;
		}

		/**
		@@ -110,8 +110,11 @@ int seq_buf_bitmask(struct seq_buf s, const unsigned long maskp,
		WARN_ON(s->size == 0);

		/*
		* The last byte of the buffer is used to determine if we
		* overflowed or not.
		* Note, because bitmap_scnprintf() only returns the number of bytes
		* written and not the number that would be written, we use the last
		* byte of the buffer to let us know if we overflowed. There's a small
		* chance that the bitmap could have fit exactly inside the buffer, but
		* it's not that critical if that does happen.
		*/
		if (len > 1) {
		ret = bitmap_scnprintf(s->buffer + s->len, len, maskp, nmaskbits);