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author | Denys Vlasenko <dvlasenk@redhat.com> | 2015-03-31 19:00:11 +0200 |
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committer | Ingo Molnar <mingo@kernel.org> | 2015-04-01 13:17:39 +0200 |
commit | a6de5a21fb25cdbbdf3c3e9afd8481581c4f2464 (patch) | |
tree | 7e9c124b37e7ef6f512ee9fbf7799bd9f3274a53 /arch/sparc/prom/mp.c | |
parent | a734b4a23e4b5a5bba577d11b6e2ff21f6ca4fce (diff) | |
download | linux-a6de5a21fb25cdbbdf3c3e9afd8481581c4f2464.tar.gz |
x86/asm/entry/64: Use local label to skip around sycall dispatch
Logically, we just want to jump around the following instruction and its prologue/epilogue: call *sys_call_table(,%rax,8) if the syscall number is too big - we do not specifically target the "int_ret_from_sys_call" label. Use a local, numerical label for this jump, for more clarity. This also makes the code smaller: -ffffffff8187756b: 0f 87 0f 00 00 00 ja ffffffff81877580 <int_ret_from_sys_call> +ffffffff8187756b: 77 0f ja ffffffff8187757c <int_ret_from_sys_call> because jumps to global labels are never translated to short jump instructions by GAS. Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com> Cc: Alexei Starovoitov <ast@plumgrid.com> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Borislav Petkov <bp@alien8.de> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Kees Cook <keescook@chromium.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Will Drewry <wad@chromium.org> Link: http://lkml.kernel.org/r/1427821211-25099-9-git-send-email-dvlasenk@redhat.com [ Improved the changelog. ] Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/sparc/prom/mp.c')
0 files changed, 0 insertions, 0 deletions