From: Alexey Dobriyan <adobriyan@gmail.com>
To: akpm@linux-foundation.org
Cc: linux-kernel@vger.kernel.org
Subject: [PATCH -mm] elf: init pt_regs pointer later
Date: Fri, 19 Apr 2019 23:03:43 +0300 [thread overview]
Message-ID: <20190419200343.GA19788@avx2> (raw)
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 <adobriyan@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
next reply other threads:[~2019-04-19 20:03 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-19 20:03 Alexey Dobriyan [this message]
2019-04-19 20:08 ` [PATCH -mm] elf: init pt_regs pointer later Andrew Morton
2019-04-20 18:07 ` Alexey Dobriyan
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