Messages in this thread Patch in this message | | | Date | Fri, 27 Mar 2015 13:15:21 +0100 | From | Borislav Petkov <> | Subject | Re: [tip:x86/asm] x86/asm/entry/64: Use better label name, fix comments |
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On Fri, Mar 27, 2015 at 04:46:44AM -0700, tip-bot for Denys Vlasenko wrote: > Commit-ID: 146b2b097d7a322b64b88a927fc5d870fc79a60b > Gitweb: http://git.kernel.org/tip/146b2b097d7a322b64b88a927fc5d870fc79a60b > Author: Denys Vlasenko <dvlasenk@redhat.com> > AuthorDate: Wed, 25 Mar 2015 18:18:13 +0100 > Committer: Ingo Molnar <mingo@kernel.org> > CommitDate: Fri, 27 Mar 2015 09:57:05 +0100 > > x86/asm/entry/64: Use better label name, fix comments > > A named label "ret_from_sys_call" implies that there are jumps > to this location from elsewhere, as happens with many other > labels in this file. > > But this label is used only by the JMP a few insns above. > To make that obvious, use local numeric label instead. > > Improve comments: > > "and return regs->ax" isn't too informative. We always return > regs->ax. > > The comment suggesting that it'd be cool to use rip relative > addressing for CALL is deleted. It's unclear why that would be > an improvement - we aren't striving to use position-independent > code here. PIC code here would require something like LEA > sys_call_table(%rip),reg + CALL *(reg,%rax*8)... > > "iret frame is also incomplete" is no longer true, fix that too. > > Also fix typo in comment. > > 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/1427303896-24023-1-git-send-email-dvlasenk@redhat.com > Signed-off-by: Ingo Molnar <mingo@kernel.org> > --- > arch/x86/kernel/entry_64.S | 13 ++++++------- > 1 file changed, 6 insertions(+), 7 deletions(-)
Shouldn't you take v2 of that one?
https://lkml.kernel.org/r/1427307629-10024-1-git-send-email-dvlasenk@redhat.com
v2 is missing this hunk though:
--- @@ -1407,7 +1406,7 @@ ENTRY(nmi) * NMI. */
- /* Use %rdx as out temp variable throughout */ + /* Use %rdx as our temp variable throughout */ pushq_cfi %rdx CFI_REL_OFFSET rdx, 0 -- I blame Denys for sending too many patches! :)
-- Regards/Gruss, Boris.
ECO tip #101: Trim your mails when you reply. --
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