[PATCH -mm] elf: init pt_regs pointer later

[Alexey Dobriyan]

Get "current_pt_regs" pointer right before usage.

Space savings on x86_64:

        add/remove: 0/0 grow/shrink: 0/1 up/down: 0/-180 (-180)
        Function                           old     new   delta
        load_elf_binary                   5806    5626    -180 !!!

Signed-off-by: Alexey Dobriyan <adobri...@gmail.com>
---

 fs/binfmt_elf.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/fs/binfmt_elf.c
+++ b/fs/binfmt_elf.c
@@ -704,12 +704,12 @@ static int load_elf_binary(struct linux_binprm *bprm)
        unsigned long start_code, end_code, start_data, end_data;
        unsigned long reloc_func_desc __maybe_unused = 0;
        int executable_stack = EXSTACK_DEFAULT;
-       struct pt_regs *regs = current_pt_regs();
        struct {
                struct elfhdr elf_ex;
                struct elfhdr interp_elf_ex;
        } *loc;
        struct arch_elf_state arch_state = INIT_ARCH_ELF_STATE;
+       struct pt_regs *regs;
 
        loc = kmalloc(sizeof(*loc), GFP_KERNEL);
        if (!loc) {
@@ -1159,6 +1159,7 @@ static int load_elf_binary(struct linux_binprm *bprm)
                                MAP_FIXED | MAP_PRIVATE, 0);
        }
 
+       regs = current_pt_regs();
 #ifdef ELF_PLAT_INIT
        /*
         * The ABI may specify that certain registers be set up in special