For an XIP build, _edata_loc, not _etext, is the end of constant R/O
memory that needs to be mapped into the MODULES_VADDR area. This fixes
the bug where you might loose part of your R/O data after page table
setup is complete.
Signed-off-by: Chris Brandt <chris.bra...@renesas.com>
---
arch/arm/kernel/module.c | 2 +-
arch/arm/mm/mmu.c | 4 ++--
include/asm-generic/sections.h | 2 +-
3 files changed, 4 insertions(+), 4 deletions(-)
diff --git a/arch/arm/kernel/module.c b/arch/arm/kernel/module.c
index efdddcb..41ae2cc 100644
--- a/arch/arm/kernel/module.c
+++ b/arch/arm/kernel/module.c
@@ -34,7 +34,7 @@
* recompiling the whole kernel when CONFIG_XIP_KERNEL is turned on/off.
*/
#undef MODULES_VADDR
-#define MODULES_VADDR (((unsigned long)_etext + ~PMD_MASK) & PMD_MASK)
+#define MODULES_VADDR (((unsigned long)_edata_loc + ~PMD_MASK) & PMD_MASK)
#endif
#ifdef CONFIG_MMU
diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c
index 6ca7d9a..57456df 100644
--- a/arch/arm/mm/mmu.c
+++ b/arch/arm/mm/mmu.c
@@ -1162,7 +1162,7 @@ static inline void prepare_page_table(void)
#ifdef CONFIG_XIP_KERNEL
/* The XIP kernel is mapped in the module area -- skip over it */
- addr = ((unsigned long)_etext + PMD_SIZE - 1) & PMD_MASK;
+ addr = ((unsigned long)_edata_loc + PMD_SIZE - 1) & PMD_MASK;
#endif
for ( ; addr < PAGE_OFFSET; addr += PMD_SIZE)
pmd_clear(pmd_off_k(addr));
@@ -1241,7 +1241,7 @@ static void __init devicemaps_init(const struct
machine_desc *mdesc)
#ifdef CONFIG_XIP_KERNEL
map.pfn = __phys_to_pfn(CONFIG_XIP_PHYS_ADDR & SECTION_MASK);
map.virtual = MODULES_VADDR;
- map.length = ((unsigned long)_etext - map.virtual + ~SECTION_MASK) &
SECTION_MASK;
+ map.length = ((unsigned long)_edata_loc - map.virtual + ~SECTION_MASK)
& SECTION_MASK;
map.type = MT_ROM;
create_mapping(&map);
#endif
diff --git a/include/asm-generic/sections.h b/include/asm-generic/sections.h
index b58fd66..195554d 100644
--- a/include/asm-generic/sections.h
+++ b/include/asm-generic/sections.h
@@ -26,7 +26,7 @@
* __ctors_start, __ctors_end
*/
extern char _text[], _stext[], _etext[];
-extern char _data[], _sdata[], _edata[];
+extern char _data[], _sdata[], _edata[], _edata_loc[];
extern char __bss_start[], __bss_stop[];
extern char __init_begin[], __init_end[];
extern char _sinittext[], _einittext[];
--
1.7.9.5
--
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