linux-kernel - next-20250821 cacheflush.h:61:3: error: incompatible pointer types passing 'memdesc_flags_t *' to parameter of type 'volatile unsigned long *' [-Werror,-Wincompatible-pointer-types]

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Message-ID: <CA+G9fYthMAr3w=U_GmbLPgMb7xNdjbqmxYWF0iUEuJzxnw3dxg@mail.gmail.com>
Date: Thu, 21 Aug 2025 16:26:55 +0530
From: Naresh Kamboju <naresh.kamboju@...aro.org>
To: open list <linux-kernel@...r.kernel.org>, linux-mips@...r.kernel.org, 
	lkft-triage@...ts.linaro.org, Linux Regressions <regressions@...ts.linux.dev>
Cc: Thomas Bogendoerfer <tsbogend@...ha.franken.de>, Arnd Bergmann <arnd@...db.de>, 
	Anders Roxell <anders.roxell@...aro.org>, Ben Copeland <benjamin.copeland@...aro.org>, 
	Dan Carpenter <dan.carpenter@...aro.org>
Subject: next-20250821 cacheflush.h:61:3: error: incompatible pointer types
 passing 'memdesc_flags_t *' to parameter of type 'volatile unsigned long *' [-Werror,-Wincompatible-pointer-types]

The following build warnings / errors noticed with mips defconfig with
clang-20 and gcc-12 toolchains.

Regression Analysis:
- New regression? yes
- Reproducibility? yes

Build regression: next-20250821 cacheflush.h:61:3: error: incompatible
pointer types passing 'memdesc_flags_t *' to parameter of type
'volatile unsigned long *' [-Werror,-Wincompatible-pointer-types]

Reported-by: Linux Kernel Functional Testing <lkft@...aro.org>

* mips, build
  - clang-nightly-allnoconfig
  - clang-nightly-defconfig
  - clang-nightly-lkftconfig-hardening
  - clang-nightly-lkftconfig-lto-full
  - clang-nightly-lkftconfig-lto-thing
  - clang-nightly-tinyconfig
  - gcc-12-allnoconfig
  - gcc-12-ath79_defconfig
  - gcc-12-bcm47xx_defconfig
  - gcc-12-bcm63xx_defconfig
  - gcc-12-cavium_octeon_defconfig
  - gcc-12-defconfig
  - gcc-12-malta_defconfig
  - gcc-12-rt305x_defconfig
  - gcc-12-tinyconfig
  - gcc-13-lkftconfig-hardening
  - gcc-8-allnoconfig
  - gcc-8-ath79_defconfig
  - gcc-8-bcm47xx_defconfig
  - gcc-8-bcm63xx_defconfig
  - gcc-8-cavium_octeon_defconfig
  - gcc-8-defconfig
  - gcc-8-lkftconfig-hardening
  - gcc-8-malta_defconfig
  - gcc-8-rt305x_defconfig
  - gcc-8-tinyconfig


## Build error mips
In file included from include/linux/cacheflush.h:5:
arch/mips/include/asm/cacheflush.h:61:3: error: incompatible pointer
types passing 'memdesc_flags_t *' to parameter of type 'volatile
unsigned long *' [-Werror,-Wincompatible-pointer-types]
   61 |                 folio_set_dcache_dirty(folio);
      |                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
arch/mips/include/asm/cacheflush.h:42:27: note: expanded from macro
'folio_set_dcache_dirty'
   42 |         set_bit(PG_dcache_dirty, &(folio)->flags)
      |                                  ^~~~~~~~~~~~~~~
arch/mips/include/asm/bitops.h:89:70: note: passing argument to
parameter 'addr' here
   89 | static inline void set_bit(unsigned long nr, volatile unsigned
long *addr)
      |                                                                      ^

In file included from include/linux/cacheflush.h:5:
arch/mips/include/asm/cacheflush.h:70:3: error: incompatible pointer
types passing 'memdesc_flags_t *' to parameter of type 'volatile
unsigned long *' [-Werror,-Wincompatible-pointer-types]
   70 |                 folio_set_dcache_dirty(page_folio(page));
      |                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
arch/mips/include/asm/cacheflush.h:42:27: note: expanded from macro
'folio_set_dcache_dirty'
   42 |         set_bit(PG_dcache_dirty, &(folio)->flags)
      |                                  ^~~~~~~~~~~~~~~
arch/mips/include/asm/bitops.h:89:70: note: passing argument to
parameter 'addr' here
   89 | static inline void set_bit(unsigned long nr, volatile unsigned
long *addr)
      |                                                                      ^
2 errors generated.

## Source
* Kernel version: 6.17.0-rc2
* Git tree: https://kernel.googlesource.com/pub/scm/linux/kernel/git/next/linux-next.git
* Git describe: next-20250821
* Git commit: 7fa4d8dc380fbd81a9d702a855c50690c9c6442c
* Architectures: mips
* Toolchains: clang-20 gcc-12
* Kconfigs: defconfig

## Build
* Build log: https://qa-reports.linaro.org/api/testruns/29616797/log_file/
* Build details mips:
https://regressions.linaro.org/lkft/linux-next-master/next-20250821/build/clang-nightly-defconfig/
* Build plan: https://tuxapi.tuxsuite.com/v1/groups/linaro/projects/lkft/builds/31aRYnoYJbpEW0zZyTGvO2w7OCn
* Build link: https://storage.tuxsuite.com/public/linaro/lkft/builds/31aRYnoYJbpEW0zZyTGvO2w7OCn/
* Kernel config:
https://storage.tuxsuite.com/public/linaro/lkft/builds/31aRYnoYJbpEW0zZyTGvO2w7OCn/config

--
Linaro LKFT
https://lkft.linaro.org