linux-kernel - [PATCH 0/1] spi: cadence-quadspi: Fix a compilation warning for 64-bit platform

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Date:   Tue, 12 Jan 2021 18:06:36 +0800
From:   Zhen Lei <thunder.leizhen@...wei.com>
To:     Mark Brown <broonie@...nel.org>,
        linux-spi <linux-spi@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
CC:     Zhen Lei <thunder.leizhen@...wei.com>,
        Yanteng Si <siyanteng@...ngson.cn>,
        Pratyush Yadav <p.yadav@...com>
Subject: [PATCH 0/1] spi: cadence-quadspi: Fix a compilation warning for 64-bit platform

This patch is based on the latest linux-next. So the Fixes commit-id
maybe changed when it merged int v5.12-rc1. For details about the problem
analysis, see the patch description. The auxiliary information is listed here.

1) the type of size_t on 32-bit and 64-bit platforms
include/uapi/asm-generic/posix_types.h:
typedef unsigned long   __kernel_ulong_t;

#if __BITS_PER_LONG != 64
typedef unsigned int    __kernel_size_t;
#else
typedef __kernel_ulong_t __kernel_size_t;
#endif

include/linux/types.h:
typedef __kernel_size_t         size_t;

2) The compilation warning information on arm64:
In file included from ./include/linux/kernel.h:14,
                 from ./include/linux/clk.h:13,
                 from drivers/spi/spi-cadence-quadspi.c:9:
drivers/spi/spi-cadence-quadspi.c: In function ‘cqspi_direct_read_execute’:
./include/linux/minmax.h:18:28: warning: comparison of distinct pointer types lacks a cast
   18 |  (!!(sizeof((typeof(x) *)1 == (typeof(y) *)1)))
      |                            ^~
./include/linux/minmax.h:32:4: note: in expansion of macro ‘__typecheck’
   32 |   (__typecheck(x, y) && __no_side_effects(x, y))
      |    ^~~~~~~~~~~
./include/linux/minmax.h:42:24: note: in expansion of macro ‘__safe_cmp’
   42 |  __builtin_choose_expr(__safe_cmp(x, y), \
      |                        ^~~~~~~~~~
./include/linux/minmax.h:58:19: note: in expansion of macro ‘__careful_cmp’
   58 | #define max(x, y) __careful_cmp(x, y, >)
      |                   ^~~~~~~~~~~~~
drivers/spi/spi-cadence-quadspi.c:1153:24: note: in expansion of macro ‘max’
 1153 |       msecs_to_jiffies(max(len, 500U)))) {
      |                        ^~~


Zhen Lei (1):
  spi: cadence-quadspi: Fix a compilation warning for 64-bit platform

 drivers/spi/spi-cadence-quadspi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

-- 
1.8.3