[Xen-changelog] [xen staging] xen/arm: cpufeature: Match register size with value size in cpus_have_const_cap

[patchbot@xxxxxxx]

commit 32a813fe7d531cdb81221930e150edfba7cbbf52
Author:     Julien Grall <julien.grall@xxxxxxx>
AuthorDate: Tue Mar 26 21:26:57 2019 +0000
Commit:     Julien Grall <julien.grall@xxxxxxx>
CommitDate: Thu Oct 3 11:38:34 2019 +0100

    xen/arm: cpufeature: Match register size with value size in 
cpus_have_const_cap
    
    Clang is pickier than GCC for the register size in asm statement. It
    expects the register size to match the value size.
    
    The asm statement expects a 32-bit (resp. 64-bit) value on Arm32
    (resp. Arm64) whereas the value is a boolean (Clang consider to be
    32-bit).
    
    It would be possible to impose 32-bit register for both architecture
    but this require the code to use __OP32. However, it does no really
    improve the assembly generated. Instead, replace switch the variable to
    use register_t.
    
    Signed-off-by: Julien Grall <julien.grall@xxxxxxx>
    Release-acked-by: Juergen Gross <jgross@xxxxxxxx>
    Acked-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>
---
 xen/include/asm-arm/cpufeature.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/xen/include/asm-arm/cpufeature.h b/xen/include/asm-arm/cpufeature.h
index c2c8f3417c..d06f09ecfa 100644
--- a/xen/include/asm-arm/cpufeature.h
+++ b/xen/include/asm-arm/cpufeature.h
@@ -67,7 +67,7 @@ static inline bool cpus_have_cap(unsigned int num)
 
 /* System capability check for constant cap */
 #define cpus_have_const_cap(num) ({                 \
-        bool __ret;                                 \
+        register_t __ret;                           \
                                                     \
         asm volatile (ALTERNATIVE("mov %0, #0",     \
                                   "mov %0, #1",     \
--
generated by git-patchbot for /home/xen/git/xen.git#staging

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