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[PATCH] iommu/exynos: prevent building on big-endian kernels

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  [PATCH] iommu/exynos: prevent building on big-endian kernels Arnd Bergmann <arnd@arndb.de> - 2017-07-28 15:30 +0200
    Re: [PATCH] iommu/exynos: prevent building on big-endian kernels Krzysztof Kozlowski <krzk@kernel.org> - 2017-07-28 21:20 +0200

#1698785 — [PATCH] iommu/exynos: prevent building on big-endian kernels

Since we print the correct warning, an allmodconfig build is no longer
clean but always prints it, which defeats compile-testing:

drivers/iommu/exynos-iommu.c:58:2: error: #warning "revisit driver if we can enable big-endian ptes" [-Werror=cpp]

This replaces the #warning with a dependency, moving warning text into
a comment.

Fixes: 1f59adb1766d ("iommu/exynos: Replace non-existing big-endian Kconfig option")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 drivers/iommu/Kconfig        | 1 +
 drivers/iommu/exynos-iommu.c | 4 ----
 2 files changed, 1 insertion(+), 4 deletions(-)

diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig
index f73ff28f77e2..c5d80fe3dab9 100644
--- a/drivers/iommu/Kconfig
+++ b/drivers/iommu/Kconfig
@@ -253,6 +253,7 @@ config TEGRA_IOMMU_SMMU
 config EXYNOS_IOMMU
 	bool "Exynos IOMMU Support"
 	depends on ARCH_EXYNOS && MMU
+	depends on !CPU_BIG_ENDIAN # revisit driver if we can enable big-endian ptes
 	select IOMMU_API
 	select ARM_DMA_USE_IOMMU
 	help
diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c
index b7aebaf28b82..c6b69e91132b 100644
--- a/drivers/iommu/exynos-iommu.c
+++ b/drivers/iommu/exynos-iommu.c
@@ -54,10 +54,6 @@ typedef u32 sysmmu_pte_t;
 #define lv2ent_small(pent) ((*(pent) & 2) == 2)
 #define lv2ent_large(pent) ((*(pent) & 3) == 1)
 
-#ifdef CONFIG_CPU_BIG_ENDIAN
-#warning "revisit driver if we can enable big-endian ptes"
-#endif
-
 /*
  * v1.x - v3.x SYSMMU supports 32bit physical and 32bit virtual address spaces
  * v5.0 introduced support for 36bit physical address space by shifting
-- 
2.9.0

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#1699038

On Fri, Jul 28, 2017 at 03:19:19PM +0200, Arnd Bergmann wrote:
> Since we print the correct warning, an allmodconfig build is no longer
> clean but always prints it, which defeats compile-testing:
> 
> drivers/iommu/exynos-iommu.c:58:2: error: #warning "revisit driver if we can enable big-endian ptes" [-Werror=cpp]
> 
> This replaces the #warning with a dependency, moving warning text into
> a comment.
> 
> Fixes: 1f59adb1766d ("iommu/exynos: Replace non-existing big-endian Kconfig option")
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> ---
>  drivers/iommu/Kconfig        | 1 +
>  drivers/iommu/exynos-iommu.c | 4 ----
>  2 files changed, 1 insertion(+), 4 deletions(-)
>

Makes sense, although there is no error to fix (for fixes tag). If there
was an error, then probably the one bringing warning and wrong kconfig
option (6ae5343c26f9cba5e9ef8 "iommu/exynos: update to use iommu
big-endian")?

Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org>

Best regards,
Krzysztof

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