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[PATCH v3 1/6] xen/arm: Skip initializing the BSS section when it is empty
- To: <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Ayan Kumar Halder <ayan.kumar.halder@xxxxxxx>
- Date: Thu, 10 Oct 2024 15:03:46 +0100
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- Cc: Ayan Kumar Halder <ayan.kumar.halder@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, "Volodymyr Babchuk" <Volodymyr_Babchuk@xxxxxxxx>
- Delivery-date: Thu, 10 Oct 2024 14:05:11 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
If the BSS section is empty, then the function can just return.
Signed-off-by: Ayan Kumar Halder <ayan.kumar.halder@xxxxxxx>
---
Changes from :-
v1..v2 - New patch introduced in v3.
xen/arch/arm/arm64/head.S | 2 ++
1 file changed, 2 insertions(+)
diff --git a/xen/arch/arm/arm64/head.S b/xen/arch/arm/arm64/head.S
index 14c3720d80..72c7b24498 100644
--- a/xen/arch/arm/arm64/head.S
+++ b/xen/arch/arm/arm64/head.S
@@ -346,6 +346,8 @@ FUNC_LOCAL(zero_bss)
PRINT("- Zero BSS -\r\n")
ldr x0, =__bss_start /* x0 := vaddr(__bss_start) */
ldr x1, =__bss_end /* x1 := vaddr(__bss_end) */
+ cmp x1, x0
+ beq skip_bss
1: str xzr, [x0], #8
cmp x0, x1
--
2.25.1
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