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Diffstat (limited to 'arch/x86/include/asm/setup.h')
-rw-r--r--arch/x86/include/asm/setup.h38
1 files changed, 21 insertions, 17 deletions
diff --git a/arch/x86/include/asm/setup.h b/arch/x86/include/asm/setup.h
index 7590ac2570b9..f8b9ee97a891 100644
--- a/arch/x86/include/asm/setup.h
+++ b/arch/x86/include/asm/setup.h
@@ -108,19 +108,16 @@ extern unsigned long _brk_end;
void *extend_brk(size_t size, size_t align);
/*
- * Reserve space in the brk section. The name must be unique within the file,
- * and somewhat descriptive. The size is in bytes.
+ * Reserve space in the .brk section, which is a block of memory from which the
+ * caller is allowed to allocate very early (before even memblock is available)
+ * by calling extend_brk(). All allocated memory will be eventually converted
+ * to memblock. Any leftover unallocated memory will be freed.
*
- * The allocation is done using inline asm (rather than using a section
- * attribute on a normal variable) in order to allow the use of @nobits, so
- * that it doesn't take up any space in the vmlinux file.
+ * The size is in bytes.
*/
-#define RESERVE_BRK(name, size) \
- asm(".pushsection .brk_reservation,\"aw\",@nobits\n\t" \
- ".brk." #name ":\n\t" \
- ".skip " __stringify(size) "\n\t" \
- ".size .brk." #name ", " __stringify(size) "\n\t" \
- ".popsection\n\t")
+#define RESERVE_BRK(name, size) \
+ __section(".bss..brk") __aligned(1) __used \
+ static char __brk_##name[size]
extern void probe_roms(void);
#ifdef __i386__
@@ -133,12 +130,19 @@ asmlinkage void __init x86_64_start_reservations(char *real_mode_data);
#endif /* __i386__ */
#endif /* _SETUP */
-#else
-#define RESERVE_BRK(name,sz) \
- .pushsection .brk_reservation,"aw",@nobits; \
-.brk.name: \
-1: .skip sz; \
- .size .brk.name,.-1b; \
+
+#else /* __ASSEMBLY */
+
+.macro __RESERVE_BRK name, size
+ .pushsection .bss..brk, "aw"
+SYM_DATA_START(__brk_\name)
+ .skip \size
+SYM_DATA_END(__brk_\name)
.popsection
+.endm
+
+#define RESERVE_BRK(name, size) __RESERVE_BRK name, size
+
#endif /* __ASSEMBLY__ */
+
#endif /* _ASM_X86_SETUP_H */