[RFC PATCH 1/6] arm64: mm: explicitly declare module and ftrace execmem regions

["Adrian Barnaś" <abarnas@google.com>]

Replace the reliance on the EXECMEM_DEFAULT fallback by explicitly defining
the execution memory (execmem) regions for MODULE_TEXT, MODULE_DATA, and
FTRACE in execmem_arch_setup().

Signed-off-by: Adrian Barnaś <abarnas@google.com>
---
 arch/arm64/mm/init.c | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c
index 96711b8578fd..c673a9a839dd 100644
--- a/arch/arm64/mm/init.c
+++ b/arch/arm64/mm/init.c
@@ -519,7 +519,7 @@ struct execmem_info __init *execmem_arch_setup(void)
 
 	execmem_info = (struct execmem_info){
 		.ranges = {
-			[EXECMEM_DEFAULT] = {
+			[EXECMEM_MODULE_TEXT] = {
 				.start	= start,
 				.end	= end,
 				.pgprot	= PAGE_KERNEL,
@@ -533,12 +533,28 @@ struct execmem_info __init *execmem_arch_setup(void)
 				.pgprot	= PAGE_KERNEL_ROX,
 				.alignment = 1,
 			},
+			[EXECMEM_FTRACE] = {
+				.start	= VMALLOC_START,
+				.end	= VMALLOC_END,
+				.pgprot	= PAGE_KERNEL,
+				.alignment = 1,
+				.fallback_start	= fallback_start,
+				.fallback_end	= fallback_end,
+			},
 			[EXECMEM_BPF] = {
 				.start	= VMALLOC_START,
 				.end	= VMALLOC_END,
 				.pgprot	= PAGE_KERNEL,
 				.alignment = 1,
 			},
+			[EXECMEM_MODULE_DATA] = {
+				.start  = start,
+				.end    = end,
+				.pgprot = PAGE_KERNEL,
+				.alignment = 1,
+				.fallback_start	= fallback_start,
+				.fallback_end	= fallback_end,
+			},
 		},
 	};
 
-- 
2.54.0.1136.gdb2ca164c4-goog