[xen master] xen: Drop the (almost) unused extern start[]

[patchbot@xxxxxxx]

commit 9380f06fe82fe1886a8ae468d22b901bd6c4d3d5
Author:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
AuthorDate: Tue Jul 25 16:32:35 2023 +0100
Commit:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
CommitDate: Wed Jul 26 10:56:27 2023 +0100

    xen: Drop the (almost) unused extern start[]
    
    This global variable is shadowed by plenty local variables, violating MISRA
    rule 5.3.  Some architectures happen to have a symbol by the name of start 
in
    their head.S's, but it's not a useful symbol to reference from C.
    
    In fact, the single use of the global start[] in RISC-V means to use 
_start[]
    as the linker symbol at the beginning of the .text section, not the function
    which happens to be in the same location.
    
    Fix RISC-V to use the right symbol for it's calculation, and drop the 
extern.
    
    Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    Reviewed-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>
    Reviewed-by: Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
---
 xen/arch/riscv/mm.c      | 2 +-
 xen/include/xen/kernel.h | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/xen/arch/riscv/mm.c b/xen/arch/riscv/mm.c
index fddb3cd0bd..99ed5e9623 100644
--- a/xen/arch/riscv/mm.c
+++ b/xen/arch/riscv/mm.c
@@ -148,7 +148,7 @@ static bool __init check_pgtbl_mode_support(struct mmu_desc 
*mmu_desc,
 
     unsigned long aligned_load_start = load_start & level_map_mask;
     unsigned long aligned_page_size = XEN_PT_LEVEL_SIZE(page_table_level);
-    unsigned long xen_size = (unsigned long)(_end - start);
+    unsigned long xen_size = (unsigned long)(_end - _start);
 
     if ( (load_start + xen_size) > (aligned_load_start + aligned_page_size) )
     {
diff --git a/xen/include/xen/kernel.h b/xen/include/xen/kernel.h
index 9ac2694dc7..46b3c9c026 100644
--- a/xen/include/xen/kernel.h
+++ b/xen/include/xen/kernel.h
@@ -66,7 +66,7 @@
 })
 
 /* SAF-0-safe */
-extern char _start[], _end[], start[];
+extern char _start[], _end[];
 #define is_kernel(p) ({                         \
     char *__p = (char *)(unsigned long)(p);     \
     (__p >= _start) && (__p < _end);            \
--
generated by git-patchbot for /home/xen/git/xen.git#master