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From:   Sunil V L <sunilvl@ventanamicro.com>
To:     linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
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Cc:     Jonathan Corbet <corbet@lwn.net>,
        Paul Walmsley <paul.walmsley@sifive.com>,
        Palmer Dabbelt <palmer@dabbelt.com>,
        Albert Ou <aou@eecs.berkeley.edu>,
        "Rafael J . Wysocki" <rafael@kernel.org>,
        Len Brown <lenb@kernel.org>,
        Daniel Lezcano <daniel.lezcano@linaro.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Weili Qian <qianweili@huawei.com>,
        Zhou Wang <wangzhou1@hisilicon.com>,
        Herbert Xu <herbert@gondor.apana.org.au>,
        "David S . Miller" <davem@davemloft.net>,
        Marc Zyngier <maz@kernel.org>,
        Maximilian Luz <luzmaximilian@gmail.com>,
        Hans de Goede <hdegoede@redhat.com>,
        Mark Gross <markgross@kernel.org>,
        Nathan Chancellor <nathan@kernel.org>,
        Nick Desaulniers <ndesaulniers@google.com>,
        Tom Rix <trix@redhat.com>, Sunil V L <sunilvl@ventanamicro.com>
Subject: [PATCH V5 02/21] platform/surface: Disable for RISC-V
Date:   Mon,  8 May 2023 17:22:18 +0530
Message-Id: <20230508115237.216337-3-sunilvl@ventanamicro.com>
In-Reply-To: <20230508115237.216337-1-sunilvl@ventanamicro.com>
References: <20230508115237.216337-1-sunilvl@ventanamicro.com>
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With CONFIG_ACPI enabled for RISC-V, this driver gets enabled
in allmodconfig build. However, RISC-V doesn't support sub-word
atomics which is used by this driver. Due to this, the build fails
with below error.

In function ‘ssh_seq_next’,
    inlined from ‘ssam_request_write_data’ at drivers/platform/surface/aggregator/controller.c:1483:8:
././include/linux/compiler_types.h:399:45: error: call to ‘__compiletime_assert_335’ declared with attribute error: BUILD_BUG failed
  399 |         _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
      |                                             ^
./include/linux/compiler.h:78:45: note: in definition of macro ‘unlikely’
   78 | # define unlikely(x)    __builtin_expect(!!(x), 0)
      |                                             ^
././include/linux/compiler_types.h:387:9: note: in expansion of macro ‘__compiletime_assert’
  387 |         __compiletime_assert(condition, msg, prefix, suffix)
      |         ^~~~~~~~~~~~~~~~~~~~
././include/linux/compiler_types.h:399:9: note: in expansion of macro ‘_compiletime_assert’
  399 |         _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
      |         ^~~~~~~~~~~~~~~~~~~
./include/linux/build_bug.h:39:37: note: in expansion of macro ‘compiletime_assert’
   39 | #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
      |                                     ^~~~~~~~~~~~~~~~~~
./include/linux/build_bug.h:59:21: note: in expansion of macro ‘BUILD_BUG_ON_MSG’
   59 | #define BUILD_BUG() BUILD_BUG_ON_MSG(1, "BUILD_BUG failed")
      |                     ^~~~~~~~~~~~~~~~
./arch/riscv/include/asm/cmpxchg.h:335:17: note: in expansion of macro ‘BUILD_BUG’
  335 |                 BUILD_BUG();                                            \
      |                 ^~~~~~~~~
./arch/riscv/include/asm/cmpxchg.h:344:30: note: in expansion of macro ‘__cmpxchg’
  344 |         (__typeof__(*(ptr))) __cmpxchg((ptr),                           \
      |                              ^~~~~~~~~
./include/linux/atomic/atomic-instrumented.h:1916:9: note: in expansion of macro ‘arch_cmpxchg’
 1916 |         arch_cmpxchg(__ai_ptr, __VA_ARGS__); \
      |         ^~~~~~~~~~~~
drivers/platform/surface/aggregator/controller.c:61:32: note: in expansion of macro ‘cmpxchg’
   61 |         while (unlikely((ret = cmpxchg(&c->value, old, new)) != old)) {
      |                                ^~~~~~~

There is currently no plan to support this driver for RISC-V. So,
disable this driver for RISC-V even when ACPI is enabled for now.

Signed-off-by: Sunil V L <sunilvl@ventanamicro.com>
Acked-by: Maximilian Luz <luzmaximilian@gmail.com>
---
 drivers/platform/surface/aggregator/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/platform/surface/aggregator/Kconfig b/drivers/platform/surface/aggregator/Kconfig
index c114f9dd5fe1..88afc38ffdc5 100644
--- a/drivers/platform/surface/aggregator/Kconfig
+++ b/drivers/platform/surface/aggregator/Kconfig
@@ -4,7 +4,7 @@
 menuconfig SURFACE_AGGREGATOR
 	tristate "Microsoft Surface System Aggregator Module Subsystem and Drivers"
 	depends on SERIAL_DEV_BUS
-	depends on ACPI
+	depends on ACPI && !RISCV
 	select CRC_CCITT
 	help
 	  The Surface System Aggregator Module (Surface SAM or SSAM) is an
-- 
2.34.1