[PATCH] mips: fix vdso32 build, again

[PATCH] mips: fix vdso32 build, again

[Arnd Bergmann]

The generic vdso support adds the same #if hack in two places,
asm/vdso/vdso.h and config-n32-o32-env.c, but only the second
is actually used. The result lacks the BUILD_VDSO32_64 macro,
and that triggers a build error:

./include/linux/page-flags-layout.h:95:2: error: #error "Not enough bits in page flags"

Move the macro into the other place, and remove the duplicated
bits.

Reported-by: Guenter Roeck <linux@roeck-us.net>
Fixes: ee38d94a0ad8 ("page flags: prioritize kasan bits over last-cpuid")
Fixes: 24640f233b46 ("mips: Add support for generic vDSO")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
Please fold into the vdso patch
---
 arch/mips/include/asm/vdso/vdso.h   | 11 -----------
 arch/mips/vdso/config-n32-o32-env.c |  1 +
 2 files changed, 1 insertion(+), 11 deletions(-)

diff --git a/arch/mips/include/asm/vdso/vdso.h b/arch/mips/include/asm/vdso/vdso.h
index 3b96db735f7f..737ddfc3411c 100644
--- a/arch/mips/include/asm/vdso/vdso.h
+++ b/arch/mips/include/asm/vdso/vdso.h
@@ -6,17 +6,6 @@
 
 #include <asm/sgidefs.h>
 
-#if _MIPS_SIM != _MIPS_SIM_ABI64 && defined(CONFIG_64BIT)
-
-/* Building 32-bit VDSO for the 64-bit kernel. Fake a 32-bit Kconfig. */
-#define BUILD_VDSO32_64
-#undef CONFIG_64BIT
-#define CONFIG_32BIT 1
-#ifndef __ASSEMBLY__
-#include <asm-generic/atomic64.h>
-#endif
-#endif
-
 #ifndef __ASSEMBLY__
 
 #include <asm/asm.h>
diff --git a/arch/mips/vdso/config-n32-o32-env.c b/arch/mips/vdso/config-n32-o32-env.c
index da4994b2b3e5..7f8d957abd4a 100644
--- a/arch/mips/vdso/config-n32-o32-env.c
+++ b/arch/mips/vdso/config-n32-o32-env.c
@@ -12,6 +12,7 @@
 
 #define CONFIG_32BIT 1
 #define CONFIG_GENERIC_ATOMIC64 1
+#define BUILD_VDSO32_64
 
 #endif
 
-- 
2.20.0

Re: [PATCH] mips: fix vdso32 build, again

[Paul Burton]

Hello,

Arnd Bergmann wrote:
> The generic vdso support adds the same #if hack in two places,
> asm/vdso/vdso.h and config-n32-o32-env.c, but only the second
> is actually used. The result lacks the BUILD_VDSO32_64 macro,
> and that triggers a build error:
> 
> ./include/linux/page-flags-layout.h:95:2: error: #error "Not enough bits in page flags"
> 
> Move the macro into the other place, and remove the duplicated
> bits.

Applied to mips-next.

> commit 6393e6064486
> https://git.kernel.org/mips/c/6393e6064486
> 
> Reported-by: Guenter Roeck <linux@roeck-us.net>
> Fixes: ee38d94a0ad8 ("page flags: prioritize kasan bits over last-cpuid")
> Fixes: 24640f233b46 ("mips: Add support for generic vDSO")
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> Signed-off-by: Paul Burton <paul.burton@mips.com>

Thanks,
    Paul

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