[xen staging] arm/div64: Drop do_div() macro for GCC version < 4

[patchbot@xxxxxxx]

commit 92b6f2f742431c8fc5328ebcc178da7fbeae85b2
Author:     Michal Orzel <michal.orzel@xxxxxxx>
AuthorDate: Tue Sep 3 14:48:34 2024 +0200
Commit:     Stefano Stabellini <stefano.stabellini@xxxxxxx>
CommitDate: Tue Sep 3 19:41:31 2024 -0700

    arm/div64: Drop do_div() macro for GCC version < 4
    
    As stated in README, the minimum supported GCC version for arm32 is
    4.9, therefore drop the custom do_div() macro in favor of using the
    optimized version.
    
    Suggested-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    Signed-off-by: Michal Orzel <michal.orzel@xxxxxxx>
    Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    Acked-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>
---
 xen/arch/arm/include/asm/div64.h | 16 ----------------
 1 file changed, 16 deletions(-)

diff --git a/xen/arch/arm/include/asm/div64.h b/xen/arch/arm/include/asm/div64.h
index da1f1fcbd5..8fe17f0ff2 100644
--- a/xen/arch/arm/include/asm/div64.h
+++ b/xen/arch/arm/include/asm/div64.h
@@ -54,20 +54,6 @@
        __rem;                                                  \
 })
 
-#if __GNUC__ < 4
-
-/*
- * gcc versions earlier than 4.0 are simply too problematic for the
- * optimized implementation below. First there is gcc PR 15089 that
- * tend to trig on more complex constructs, spurious .global __udivsi3
- * are inserted even if none of those symbols are referenced in the
- * generated code, and those gcc versions are not able to do constant
- * propagation on long long values anyway.
- */
-#define do_div(n, base) __do_div_asm(n, base)
-
-#elif __GNUC__ >= 4
-
 #include <xen/bug.h>
 
 /*
@@ -217,8 +203,6 @@
        __r;                                                            \
 })
 
-#endif /* GCC version */
-
 #endif /* BITS_PER_LONG */
 
 #endif
--
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