[PATCH] um: fix and optimize xor select template for CONFIG64 and timetravel mode

[PATCH] um: fix and optimize xor select template for CONFIG64 and timetravel mode

[Benjamin Beichler]

Due to dropped inclusion of asm-generic/xor.h, xor_block_8regs symbol is
missing with CONFIG64 and break compilation, as the asm/xor_64.h also did
not include it. The patch recreate the logic from arch/x86, which check
whether AVX is available and add fallbacks for 32bit and 64bit config of
um.

A very minor additional "fix" is, the return of the macro parameter
instead of NULL, as this is the original intent of the macro, but
this does not change the actual behavior.

Fixes: c0ecca6604b8 ("um: enable the use of optimized xor routines in UML")
Signed-off-by: Benjamin Beichler <benjamin.beichler@uni-rostock.de>
---
 arch/um/include/asm/xor.h | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/um/include/asm/xor.h b/arch/um/include/asm/xor.h
index f512704a9ec7..22b39de73c24 100644
--- a/arch/um/include/asm/xor.h
+++ b/arch/um/include/asm/xor.h
@@ -4,8 +4,10 @@
 
 #ifdef CONFIG_64BIT
 #undef CONFIG_X86_32
+#define TT_CPU_INF_XOR_DEFAULT (AVX_SELECT(&xor_block_sse_pf64))
 #else
 #define CONFIG_X86_32 1
+#define TT_CPU_INF_XOR_DEFAULT (AVX_SELECT(&xor_block_8regs))
 #endif
 
 #include <asm/cpufeature.h>
@@ -16,7 +18,7 @@
 #undef XOR_SELECT_TEMPLATE
 /* pick an arbitrary one - measuring isn't possible with inf-cpu */
 #define XOR_SELECT_TEMPLATE(x)	\
-	(time_travel_mode == TT_MODE_INFCPU ? &xor_block_8regs : NULL)
+	(time_travel_mode == TT_MODE_INFCPU ? TT_CPU_INF_XOR_DEFAULT : x))
 #endif
 
 #endif
-- 
2.25.1

Re: [PATCH] um: fix and optimize xor select template for CONFIG64 and timetravel mode

[Anton Ivanov]

On 11/01/2022 20:05, Benjamin Beichler wrote:
> Due to dropped inclusion of asm-generic/xor.h, xor_block_8regs symbol is
> missing with CONFIG64 and break compilation, as the asm/xor_64.h also did
> not include it. The patch recreate the logic from arch/x86, which check
> whether AVX is available and add fallbacks for 32bit and 64bit config of
> um.
> 
> A very minor additional "fix" is, the return of the macro parameter
> instead of NULL, as this is the original intent of the macro, but
> this does not change the actual behavior.
> 
> Fixes: c0ecca6604b8 ("um: enable the use of optimized xor routines in UML")
> Signed-off-by: Benjamin Beichler <benjamin.beichler@uni-rostock.de>
> ---
>   arch/um/include/asm/xor.h | 4 +++-
>   1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/um/include/asm/xor.h b/arch/um/include/asm/xor.h
> index f512704a9ec7..22b39de73c24 100644
> --- a/arch/um/include/asm/xor.h
> +++ b/arch/um/include/asm/xor.h
> @@ -4,8 +4,10 @@
>   
>   #ifdef CONFIG_64BIT
>   #undef CONFIG_X86_32
> +#define TT_CPU_INF_XOR_DEFAULT (AVX_SELECT(&xor_block_sse_pf64))
>   #else
>   #define CONFIG_X86_32 1
> +#define TT_CPU_INF_XOR_DEFAULT (AVX_SELECT(&xor_block_8regs))
>   #endif
>   
>   #include <asm/cpufeature.h>
> @@ -16,7 +18,7 @@
>   #undef XOR_SELECT_TEMPLATE
>   /* pick an arbitrary one - measuring isn't possible with inf-cpu */
>   #define XOR_SELECT_TEMPLATE(x)	\
> -	(time_travel_mode == TT_MODE_INFCPU ? &xor_block_8regs : NULL)
> +	(time_travel_mode == TT_MODE_INFCPU ? TT_CPU_INF_XOR_DEFAULT : x))
>   #endif
>   
>   #endif
> 
Acked-By: Anton Ivanov <anton.ivanov@cambridgegreys.com>
-- 
Anton R. Ivanov
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