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seq_buf: Make DECLARE_SEQ_BUF() usable

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Using the address operator on the array doesn't work:

./include/linux/seq_buf.h:27:27: error: initialization of ‘char *’
  from incompatible pointer type ‘char (*)[128]’
  [-Werror=incompatible-pointer-types]
   27 |                 .buffer = &__ ## NAME ## _buffer,       \
      |                           ^

Apart from fixing that, we can improve DECLARE_SEQ_BUF() by using a
compound literal to define the buffer array without attaching a name
to it. This makes the macro a single statement, allowing constructs
such as:

  static DECLARE_SEQ_BUF(my_seq_buf, MYSB_SIZE);

to work as intended.

Link: https://lkml.kernel.org/r/20240116-declare-seq-buf-fix-v1-1-915db4692f32@linux.ibm.com

Cc: stable@vger.kernel.org
Acked-by: Kees Cook <keescook@chromium.org>
Fixes: dcc4e5728eea ("seq_buf: Introduce DECLARE_SEQ_BUF and seq_buf_str()")
Signed-off-by: Nathan Lynch <nathanl@linux.ibm.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
This commit is contained in:
Nathan Lynch 2024-01-16 08:09:25 -06:00 committed by Steven Rostedt (Google)
parent 1057066009
commit 7a8e9cdf94
1 changed files with 1 additions and 2 deletions
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3
include/linux/seq_buf.h
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@ -22,9 +22,8 @@ struct seq_buf {
};
#define DECLARE_SEQ_BUF(NAME, SIZE) \
char __ ## NAME ## _buffer[SIZE] = ""; \
struct seq_buf NAME = { \
.buffer = &__ ## NAME ## _buffer, \
.buffer = (char[SIZE]) { 0 }, \
.size = SIZE, \
}