x86, 64-bit: patch paravirt inline replacements when loading modules

small speedup.

Paravirt replacements were added to the i386 module loader by commit
139ec7c416248b9ea227d21839235344edfee1e0.  This adds the same code to
the x86_64 module loader.

Signed-off-by: Anders Kaseorg <andersk@mit.edu>
Acked-by: "H. Peter Anvin" <hpa@zytor.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/arch/x86/kernel/module_64.c b/arch/x86/kernel/module_64.c
index a888e67..0e86767 100644 (file)
--- a/arch/x86/kernel/module_64.c
+++ b/arch/x86/kernel/module_64.c
@@ -150,7 +150,8 @@ int module_finalize(const Elf_Ehdr *hdr,
                     const Elf_Shdr *sechdrs,
                     struct module *me)
 {
-       const Elf_Shdr *s, *text = NULL, *alt = NULL, *locks = NULL;
+       const Elf_Shdr *s, *text = NULL, *alt = NULL, *locks = NULL,
+               *para = NULL;
        char *secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
 
        for (s = sechdrs; s < sechdrs + hdr->e_shnum; s++) {
@@ -160,6 +161,8 @@ int module_finalize(const Elf_Ehdr *hdr,
                        alt = s;
                if (!strcmp(".smp_locks", secstrings + s->sh_name))
                        locks= s;
+               if (!strcmp(".parainstructions", secstrings + s->sh_name))
+                       para = s;
        }
 
        if (alt) {
@@ -175,6 +178,11 @@ int module_finalize(const Elf_Ehdr *hdr,
                                            tseg, tseg + text->sh_size);
        }
 
+       if (para) {
+               void *pseg = (void *)para->sh_addr;
+               apply_paravirt(pseg, pseg + para->sh_size);
+       }
+
        return module_bug_finalize(hdr, sechdrs, me);
 }