[PATCH] i386: move startup_32() in text.head section

o Entry startup_32 was in .text section but it was accessing some init
  data too and it prompts MODPOST to generate compilation warnings.

WARNING: vmlinux - Section mismatch: reference to .init.data:boot_params from
.text between '_text' (at offset 0xc0100029) and 'startup_32_smp'
WARNING: vmlinux - Section mismatch: reference to .init.data:boot_params from
.text between '_text' (at offset 0xc0100037) and 'startup_32_smp'
WARNING: vmlinux - Section mismatch: reference to
.init.data:init_pg_tables_end from .text between '_text' (at offset
0xc0100099) and 'startup_32_smp'

o Can't move startup_32 to .init.text as this entry point has to be at the
  start of bzImage. Hence moved startup_32 to a new section .text.head and
  instructed MODPOST to not to generate warnings if init data is being
  accessed from .text.head section. This code has been audited.

o SMP boot up code (startup_32_smp) can go into .init.text if CPU hotplug
  is not supported. Otherwise it generates more warnings

WARNING: vmlinux - Section mismatch: reference to .init.data:new_cpu_data from
.text between 'checkCPUtype' (at offset 0xc0100126) and 'is486'
WARNING: vmlinux - Section mismatch: reference to .init.data:new_cpu_data from
.text between 'checkCPUtype' (at offset 0xc0100130) and 'is486'

Signed-off-by: Vivek Goyal <vgoyal@in.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Andi Kleen <ak@suse.de>

1 files changed, 9 insertions, 1 deletions

diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c
index 2aa47623f5f8..569e68410d7a 100644
--- a/scripts/mod/modpost.c
+++ b/scripts/mod/modpost.c
@@ -641,12 +641,20 @@ static int secref_whitelist(const char *modname, const char *tosec,
         if (f1 && f2)
                 return 1;
 
-        /* Whitelist all references from .pci_fixup section if vmlinux */
+        /* Whitelist all references from .pci_fixup section if vmlinux
+         * Whitelist all refereces from .text.head to .init.data if vmlinux
+         * Whitelist all refereces from .text.head to .init.text if vmlinux
+         */
         if (is_vmlinux(modname)) {
                 if ((strcmp(fromsec, ".pci_fixup") == 0) &&
                     (strcmp(tosec, ".init.text") == 0))
                 return 1;
 
+                if ((strcmp(fromsec, ".text.head") == 0) &&
+                        ((strcmp(tosec, ".init.data") == 0) ||
+                        (strcmp(tosec, ".init.text") == 0)))
+                return 1;
+
                 /* Check for pattern 3 */
                 for (s = pat3refsym; *s; s++)
                         if (strcmp(refsymname, *s) == 0)