x86/mm: Fix RESERVE_BRK() for older binutils

commit e32683c upstream.

With binutils 2.26, RESERVE_BRK() causes a build failure:

  /tmp/ccnGOKZ5.s: Assembler messages:
  /tmp/ccnGOKZ5.s:98: Error: missing ')'
  /tmp/ccnGOKZ5.s:98: Error: missing ')'
  /tmp/ccnGOKZ5.s:98: Error: missing ')'
  /tmp/ccnGOKZ5.s:98: Error: junk at end of line, first unrecognized
  character is `U'

The problem is this line:

  RESERVE_BRK(early_pgt_alloc, INIT_PGT_BUF_SIZE)

Specifically, the INIT_PGT_BUF_SIZE macro which (via PAGE_SIZE's use
_AC()) has a "1UL", which makes older versions of the assembler unhappy.
Unfortunately the _AC() macro doesn't work for inline asm.

Inline asm was only needed here to convince the toolchain to add the
STT_NOBITS flag.  However, if a C variable is placed in a section whose
name is prefixed with ".bss", GCC and Clang automatically set
STT_NOBITS.  In fact, ".bss..page_aligned" already relies on this trick.

So fix the build failure (and simplify the macro) by allocating the
variable in C.

Also, add NOLOAD to the ".brk" output section clause in the linker
script.  This is a failsafe in case the ".bss" prefix magic trick ever
stops working somehow.  If there's a section type mismatch, the GNU
linker will force the ".brk" output section to be STT_NOBITS.  The LLVM
linker will fail with a "section type mismatch" error.

Note this also changes the name of the variable from .brk.##name to
__brk_##name.  The variable names aren't actually used anywhere, so it's
harmless.

Fixes: a1e2c03 ("x86/mm: Simplify RESERVE_BRK()")
Reported-by: Joe Damato <[email protected]>
Reported-by: Byungchul Park <[email protected]>
Signed-off-by: Josh Poimboeuf <[email protected]>
Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
Tested-by: Joe Damato <[email protected]>
Link: https://lore.kernel.org/r/22d07a44c80d8e8e1e82b9a806ddc8c6bbb2606e.1654759036.git.jpoimboe@kernel.org
[nathan: Fix conflict due to lack of 360db4a and resolve silent
         conflict with 360db4a]
Signed-off-by: Nathan Chancellor <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

arch/x86/include/asm/setup.h

@@ -91,19 +91,16 @@ 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]
 
 /* Helper for reserving space for arrays of things */
 #define RESERVE_BRK_ARRAY(type, name, entries)		\
@@ -121,12 +118,19 @@ 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"
+GLOBAL(__brk_\name)
+	.skip \size
+END(__brk_\name)
 	.popsection
+.endm
+
+#define RESERVE_BRK(name, size) __RESERVE_BRK name, size
+
 #endif /* __ASSEMBLY__ */
+
 #endif /* _ASM_X86_SETUP_H */

arch/x86/kernel/vmlinux.lds.S

@@ -380,10 +380,10 @@ SECTIONS
 	}
 
 	. = ALIGN(PAGE_SIZE);
-	.brk : AT(ADDR(.brk) - LOAD_OFFSET) {
+	.brk (NOLOAD) : AT(ADDR(.brk) - LOAD_OFFSET) {
 		__brk_base = .;
 		. += 64 * 1024;		/* 64k alignment slop space */
-		*(.brk_reservation)	/* areas brk users have reserved */
+		*(.bss..brk)		/* areas brk users have reserved */
 		__brk_limit = .;
 	}