netdev - drivers/net/wwan/iosm/iosm_ipc_protocol.c:244:36: error: passing argument 3 of 'dma_alloc_coherent' from incompatible pointer type [-Werror=incompatible-pointer-types]

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Date:   Thu, 17 Nov 2022 20:25:29 +0100
From:   Salvatore Bonaccorso <carnil@...ian.org>
To:     M Chetan Kumar <m.chetan.kumar@...el.com>,
        Intel Corporation <linuxwwan@...el.com>
Cc:     Loic Poulain <loic.poulain@...aro.org>,
        Sergey Ryazanov <ryazanov.s.a@...il.com>,
        Johannes Berg <johannes@...solutions.net>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: drivers/net/wwan/iosm/iosm_ipc_protocol.c:244:36: error: passing
 argument 3 of 'dma_alloc_coherent' from incompatible pointer type
 [-Werror=incompatible-pointer-types]

Hi

While preparing 6.1-rc5 for Debian, we noticed that compilation of
drivers/net/wwan/iosm/iosm_ipc_protocol.c fails (with
-Werror=incompatible-pointer-types), on armhf[1]:

   gcc-12 -Wp,-MMD,drivers/net/wwan/iosm/.iosm_ipc_protocol_ops.o.d -nostdinc -I/<<PKGBUILDDIR>>/arch/arm/include -I./arch/arm/include/generated -I/<<PKGBUILDDIR>>/include -I./include -I/<<PKGBUILDDIR>>/arch/arm/include/uapi -I./arch/ar
m/include/generated/uapi -I/<<PKGBUILDDIR>>/include/uapi -I./include/generated/uapi -include /<<PKGBUILDDIR>>/include/linux/compiler-version.h -include /<<PKGBUILDDIR>>/include/linux/kconfig.h -include /<<PKGBUILDDIR>>/include/linux/compiler_types.h -D__KERNEL__ -mlittle-endian -fmacro-prefix-map=/<<PKGBUILDDIR>>/= -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE -Werror=implicit-function-declaration -Werror=implicit-int -Werror=return-type -Wno-format-security -std=gnu11 -fno-dwarf2-cfi-asm -mno-fdpic -fno-ipa-sra -mabi=aapcs-linux -mfpu=vfp -funwind-tables -mtp=cp15 -marm -Wa,-mno-warn-deprecated -D__LINUX_ARM_ARCH__=7 -march=armv7-a -msoft-float -Uarm -fno-delete-null-pointer-checks -Wno-frame-address -Wno-format-truncation -Wno-format-overflow -Wno-address-of-packed-member -O2 -fno-allow-store-data-races -Wframe-larger-than=1024 -fstack-protector-strong -Wno-main -Wno-unused-but-set-variable -Wno-unused-const-variable -Wno-dangling-pointer -ftrivial-auto-var-init=zero -fno-stack-clash-protection -pg -Wdeclaration-after-statement -Wvla -Wno-pointer-sign -Wcast-function-type -Wno-stringop-truncation -Wno-stringop-overflow -Wno-restrict -Wno-maybe-uninitialized -Wno-array-bounds -Wno-alloc-size-larger-than -Wimplicit-fallthrough=5 -fno-strict-overflow -fno-stack-check -fconserve-stack -Werror=date-time -Werror=incompatible-pointer-types -Werror=designated-init -Wno-packed-not-aligned -g -fdebug-prefix-map=/<<PKGBUILDDIR>>/= -mstack-protector-guard=tls -mstack-protector-guard-offset=1592 -I /<<PKGBUILDDIR>>/drivers/net/wwan/iosm -I ./drivers/net/wwan/iosm  -DMODULE  -DKBUILD_BASENAME='"iosm_ipc_protocol_ops"' -DKBUILD_MODNAME='"iosm"' -D__KBUILD_MODNAME=kmod_iosm -c -o drivers/net/wwan/iosm/iosm_ipc_protocol_ops.o /<<PKGBUILDDIR>>/drivers/net/wwan/iosm/iosm_ipc_protocol_ops.c  
/<<PKGBUILDDIR>>/drivers/net/wwan/iosm/iosm_ipc_protocol.c: In function 'ipc_protocol_init':
/<<PKGBUILDDIR>>/drivers/net/wwan/iosm/iosm_ipc_protocol.c:244:36: error: passing argument 3 of 'dma_alloc_coherent' from incompatible pointer type [-Werror=incompatible-pointer-types]
  244 |                                    &ipc_protocol->phy_ap_shm, GFP_KERNEL);
      |                                    ^~~~~~~~~~~~~~~~~~~~~~~~~
      |                                    |
      |                                    phys_addr_t * {aka unsigned int *}
In file included from /<<PKGBUILDDIR>>/include/linux/skbuff.h:31,
                 from /<<PKGBUILDDIR>>/drivers/net/wwan/iosm/iosm_ipc_imem.h:9,
                 from /<<PKGBUILDDIR>>/drivers/net/wwan/iosm/iosm_ipc_protocol.c:6:
/<<PKGBUILDDIR>>/include/linux/dma-mapping.h:421:29: note: expected 'dma_addr_t *' {aka 'long long unsigned int *'} but argument is of type 'phys_addr_t *' {aka 'unsigned int *'}
  421 |                 dma_addr_t *dma_handle, gfp_t gfp)
      |                 ~~~~~~~~~~~~^~~~~~~~~~
cc1: some warnings being treated as errors
make[8]: *** [/<<PKGBUILDDIR>>/scripts/Makefile.build:255: drivers/net/wwan/iosm/iosm_ipc_protocol.o] Error 1
make[8]: *** Waiting for unfinished jobs....

Regards,
Salvtore

[1]: https://buildd.debian.org/status/fetch.php?pkg=linux&arch=armhf&ver=6.1%7Erc5-1%7Eexp1&stamp=1668648913&raw=0